冶金工程术语表：Z 术语解释

供冶金工程师使用的技术术语表 以字母“Z”开头的术语

• 萨蒂延德拉
• 2025 年 8 月 5 日
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• 供冶金工程师使用的技术术语词汇表 以字母“Z”开头的术语，

冶金工程师使用的技术术语词汇表

以字母“Z”开头的术语

ZAF修正 – 它是一种定量 X 射线程序，可校正基质中的原子序数 (Z)、吸收 (A) 和荧光 (F) 效应。

z轴 – 它是三维笛卡尔坐标系中的第三个维度。 它垂直于 x 轴和 y 轴，用于表示深度或高度。 简单来说，在 3D 空间中，x 轴是左右，y 轴是上下，z 轴是前后。 在复合材料层压板中，z 轴是垂直于层压板平面的参考轴。

塞曼效应 – 在外部磁场存在的情况下，简并电子能级分裂成能量略有不同的状态。这种效应对于原子吸收光谱仪的背景校正很有用。

齐纳击穿 – 这是反向偏置 p-n 结二极管中的一种电击穿，其中强电场导致电子从价带隧道到导带，导致反向电流突然增加。 它发生在耗尽区较窄的重掺杂二极管中。

齐纳二极管 – 它是“稳压二极管”的昵称，可以依靠齐纳效应或雪崩击穿来维持大致恒定的电压。这两种效应具有相反的电压温度系数。

齐纳电阻 – 也称为齐纳管脚固定。颗粒和晶界之间的相互作用导致存在影响晶界流动性的约束力。这是一种第二相颗粒（如沉淀物）阻碍材料中晶界移动的现象，从而减缓甚至阻止晶界迁移。 这种效应对于控制材料的微观结构和性能至关重要，特别是在晶粒生长等过程中。

齐纳效应 – 也称为齐纳击穿。这是反向偏置 p-n 结二极管中的一种电击穿。 当强电场导致电子从价带隧道到导带时，就会发生这种情况，导致反向电流突然增加。 这种效应通常用于齐纳二极管中进行电压调节。

齐纳-霍洛蒙参数 – 通常表示为“Z”。它用于将温度或应变率的变化与材料的应力应变行为联系起来。它最广泛地应用于蠕变活跃时的高温下钢的成型。 它由方程 Z =e exp(Q/RT)Z=ε˙exp⁡(Q/RT) 给出，其中“e”ε˙是应变率，“Q”是活化能，“R”是气体常数，“T”是温度。 Zener-Hollomon 参数也称为温度补偿应变率，因为两者在定义中成反比。

齐纳管脚  – 它是细颗粒分散对多晶材料中低角度和高角度晶界运动的影响。小颗粒通过施加钉扎压力来阻止此类边界的运动，钉扎压力抵消了推动边界的驱动力。齐纳钉扎在材料加工中非常重要，因为它对恢复、再结晶和晶粒生长有很大影响。

齐纳电压 – 它被定义为齐纳二极管经历反向击穿时的电压，使其能够在指定范围内调节电压，通常由二极管的尺寸和杂质控制。该击穿电压可以从 2.4 伏左右调节到数百伏。

Zener-Wert-Avrami (ZWA) 函数 – 它也称为 Avrami 方程。它是一个数学模型，用于描述材料中相变的动力学，特别是在沉淀、结晶和再结晶等固态转变的背景下。 它经常用于了解和预测热处理过程中残余应力如何松弛。 本质上，Zener-Wert-Avrami 方程描述了材料的转化分数随时间和温度的变化。 Zener-Wert-Avrami 函数是一个强大的工具，可提供预测这些过程如何随时间和温度演变的框架。

沸石  – 它是一种具有规则孔隙结构的结晶水合硅铝酸盐材料。其独特的物理和化学性质赋予其良好的吸附、催化、形状选择性和离子交换特性。与其他无机材料相比，沸石因其化学性质可调、孔结构可控、水热稳定性好等优点而被广泛用作催化剂、离子交换剂和吸附剂。沸石是一类微孔结晶铝硅酸盐矿物，其特征在于其独特的蜂窝状结构，这使得它们能够充当分子筛和择形催化剂。 它们由硅、铝和氧组成，其中一些硅原子被铝取代，形成可以容纳阳离子的带负电的框架。 这种结构使它们能够根据大小和形状选择性地吸附分子。 沸石有两种类型，即(i)天然沸石和(ii)合成沸石。天然沸石是无孔的，例如 Natrolite (Na2O.Al2O3.4SiO2.2H2O)。合成沸石是多孔的，通过将瓷土、长石（ AlNaO8Si3) 和纯碱。合成沸石比天然沸石具有更高的单位重量交换容量。

沸石膜 – 它是一层薄薄的结晶铝硅酸盐材料，具有高度有序的多孔结构，用于根据分子大小和吸附特性分离气体和液体混合物。这些膜以其高化学稳定性和热稳定性而闻名，使其适用于气体分离、渗透蒸发和海水淡化等多种分离过程。

沸石工艺 – 也称为 Permutit 过程。这是一个去除水的永久和暂时硬度的过程。它涉及水中存在的钙和镁离子的沉淀。离子交换是在沸石的帮助下发生的，因此被称为沸石软化过程。为了通过沸石工艺软化水，硬水以指定的速率渗透通过保存在圆柱形容器中的沸石床。引起硬度的离子（Ca2+、Mg2+）被沸石保留为CaZe和MgZe，而排出的水含有钠盐。软化过程中发生的反应为 (i) Na2Ze + Ca(HCO3)2 =CaZe + 2NaHCO3，(ii) Na2Ze + Mg(HCO3)2 =MgZe + 2NaHCO3，(iii) Na2Ze + CaCl2 =CaZe + 2NaCl，以及 (iv) Na2Ze + MgCl2 =MgZe + 2NaCl。一段时间后，沸石完全转化为钙和镁沸石，它不再软化水，即它被耗尽。在此阶段，停止供水并通过用盐水溶液（10% NaCl溶液）处理床来回收耗尽的沸石。再生过程中发生的反应由方程式 CaZe（或 MgZe）+ 2NaCl =Na2Ze + CaCl2（或 MgCl2）给出。含有CaCl2和MgCl2的洗涤液（废液）送至下水道，由此得到的再生沸石床再次用于软化目的。

零基预算 (ZBB) – 这是 1970 年提出的概念，旨在帮助组织更好地管理成本。与传统预算不同，零基预算不会自动将任何项目纳入下一年的预算中。尽管随着组织回归传统预算技术，这一概念变得模糊且过时，但它正在重新获得关注，因为一些专家发现通过零基预算创建的年度预算与整体战略保持一致，并通过挑战传统预算下的假设来帮助提高运营效率。

零出血 – 这是一种层压板制造程序，在固化过程中不允许树脂损失。它还描述了用最终部件所需的树脂量制成的预浸料，这样在固化过程中就不需要去除任何树脂。

零碳能源载体 – 它被定义为一种物质，例如氢或氨，可以促进能量转移而不排放二氧化碳，从而支持整个经济的脱碳工作并解决能源运输和储存方面的技术和经济挑战。

过零率（ZCR） – 它被定义为测量波形穿过零轴的次数，通过对信号从负向正转变的实例进行计数来确定，反之亦然，同时考虑阈值以避免由于噪声而误计数。

零电流开关（ZCS） – 它被定义为一种当通过开关的电流为零时关闭开关的技术。它是通过电感器和电容器之间的谐振来实现的。该方法的目的是对导通时的开关电流波形进行整形，以保证换相时刻的零电流状态。

零缺陷 (ZD) – 这是一项以管理层为主导的计划，旨在消除工业生产中的缺陷。虽然它适用于任何类型的组织，但它主要在采购大量组件的供应链中采用（螺母和螺栓等常见物品就是很好的例子）。

零维模型 – 它被定义为一个简化模型，可以在整个系统上进行质量和热量平衡，以预测气体成分，而不考虑系统内的空间变化。

零延展温度（ZDT） – 这是材料失去所有可测量的延展性的温度，这意味着它会在没有任何塑性变形的情况下断裂。 从本质上讲，它是材料从在断裂前表现出一定变形能力（延性行为）转变为达到屈服强度后立即断裂（脆性行为）的温度。

零排放 – 这意味着没有有害气体或污染物释放到大气中。具体来说，它是指在运行过程中不产生排放的车辆或技术，例如电动汽车和氢燃料电池汽车。 这一概念对于通过消除化石燃料燃烧的排放来减少污染和减缓气候变化至关重要。

零排放电池 – 这些电池是指在运行过程中不产生有害排放物或污染物的电池。 这意味着它们不会向大气中释放任何温室气体或其他有毒物质。 它们是零排放车辆 (ZEV) 的关键组件，零排放车辆依靠这些电池为电动机提供动力并避免使用化石燃料。

零排放建筑 – 它被定义为实现高能源效率并产生足够的无排放可再生能源以满足特定时期内能源需求的结构。它在减少建筑行业对化石燃料的依赖和最大限度地减少温室气体排放方面发挥着至关重要的作用。

零排放技术 – 这些是指在运行过程中不产生二氧化碳排放的能源解决方案，从而大幅减少温室气体排放。这些技术可以包括可再生能源，例如光伏、风能和燃料电池，以及先进的核电站。

零能耗建筑 – 它被定义为通过减少能源需求并利用可再生能源来满足减少的需求，从而实现每年零碳排放的建筑。零能耗建筑可以通过不同的方式进行评估，包括净零场地能源使用、净零源能源使用和净零能源排放。

零错误 – 在测量仪器中，它指的是仪器在理想情况下为零时显示的读数。 这是一种系统误差，当仪器的零位标记与实际零点不对齐时发生，导致测量结果不一致。

强制零预编码 – 它被定义为一种线性预编码技术，可有效消除高信噪比（SNR）条件下的多用户干扰，实现全空间复用和多用户分集增益，同时仅限于为与发射天线数量相同的单天线用户提供服务。

零频率 – 指当某个类缺乏观察时，将数据点替换为 0（零），导致预测不准确。

零增长率 – 也称为无增长率。它表示随着时间的推移，价值或数量没有增加或减少的情况。 在金融领域，这意味着资产或现金流的价值保持不变。

零长度弹簧  – 这是专门设计的螺旋弹簧的术语，如果长度为零，则施加零力，即，在弹簧力与其长度的线图中，线穿过原点。真正的螺旋弹簧不会收缩到零长度，因为在某些点上线圈会相互接触。这里的“长度”定义为弹簧每端枢轴轴线之间的距离，无论中间有任何非弹性部分。零长度弹簧是通过制造具有内置张力的螺旋弹簧制成的（在制造过程中，在卷绕时会在钢丝中引入扭曲。这是因为螺旋弹簧在拉伸时会展开），因此如果它可以进一步收缩，则弹簧的平衡点（其恢复力为零的点）出现在长度为零的位置。在实践中，弹簧的制造通常不够精确，无法生产出张力足够一致的弹簧，适合使用零长度弹簧的应用，因此它们是通过将负长度弹簧与一块适当长度的非弹性材料组合而成的，负长度弹簧具有更大的张力，因此其平衡点位于负长度，因此零力点出现在零长度处。

零液体排放（ZLD） – 它的定义是消除液体废水排放到地表水，从而防止环境污染并促进废水回收和再利用以节约用水的处理过程。

零阶劳厄区（ZOLZ） – 它是倒易空间中的一个特定平面，包含原点 (000)，并且垂直于电子衍射中的入射电子束。 它本质上表示埃瓦尔德球与穿过原点的倒晶格平面的交点。 零级劳厄区内的反射具有与透射光束接近且对称的特征，反映了沿入射光束方向投影的晶体结构。

零压力积放输送机 – 它是一个精心设计的输送系统，可以消除紧密定位的产品之间施加的任何压力或力。

 零序电路 – 它被定义为一个等效电路模型，其中三个零序电压彼此同相，导致输入和输出电压之间的相移为零。它受串、并联变压器的绕组连接方式及其铁芯结构的影响。

零序分量 – 这些分量是指三相系统中不对称接地故障条件和不平衡负载产生的等幅和相分量。它们只能在存在中性点返回路径的地方流动，并且与正序阻抗和负序阻抗不同。

零序电压 – 它被定义为三相系统中相电压总和的三分之一。数学上表示为 Va0 =1/3 (Va + Vb + Vc)。该电压测量可以使用电压互感器的特定配置或连接到三条线路的平衡阻抗来获得。

零强度温度（ZST） – 它是指材料（通常是钢）失去所有可测量的强度并且不再能够支撑任何负载的温度。 发生这种情况的原因是加热或凝固过程中晶界熔化，阻止材料垂直于凝固方向传递力。 它是铸造和焊接等工艺中的关键参数，了解零强度温度有助于防止缺陷。

零时延 – 它被定义为系统或仪器在激发电荷载流子时的立即响应，例如在泵浦/中红外探针实验中，电荷载流子的产生在光子吸收时瞬间发生。

零近似 – 它被定义为一种方法，其中系统中单个原子的能量由整个系统中普遍存在的平均有序度决定，而不是由相邻原子的波动配置决定。这种近似的特点是对晶格的详细结构或维数不敏感。

热力学零定律 – 它指出，如果两个热力学系统各自与第三个热力学系统处于热平衡，那么它们彼此之间就处于热平衡，即，如果物体“A”与物体“C”处于热平衡（接触时它们之间没有热量传递），并且物体“B”与物体“C”处于热平衡，那么“A”与“B”处于热平衡。因此，系统之间的热平衡是一种传递关系。如果两个系统通过仅可渗透热量的壁连接并且不随时间变化，则称它们处于热平衡关系。 为了语言方便，如果系统没有相互连接以便能够相互传递热量，则有时也可以说系统处于热平衡关系，但如果它们通过仅可渗透热量的壁连接，则仍然无法这样做（即使）。

零时间 – 分别在蠕变或应力松弛试验中最初获得给定载荷或约束条件的时间。

零电压开关（ZVS） – 它被定义为一种允许电源开关和二极管在零电压下打开和关闭的方法，最大限度地减少电压和电流应力，从而减少转换器中的开关损耗。

Zeta 层 – 它是在镀锌过程中从基础钢上生长出的第三层锌铁合金。该层的化学成分约为 94% 锌和 6% 铁。 Zeta 层的 DPN（金刚石金字塔数）硬度为 179，而基础钢的 DPN 硬度为 159。

Zeta 电位 – 它也称为动电势。它是由相邻溶液中残留的、不平衡的电荷分布引起的溶液中的电势差，从而产生双层。 Zeta 电位与电极电位的不同之处在于，它仅出现在溶液相中，即它代表将溶液中的单位电荷从无穷大带到相关界面（但不通过界面）所需的可逆功。

Zeta 电位测量 – 这些测量是指纳米材料表面电荷的表征，用于研究封端剂的有效性并评估纳米颗粒的稳定性。 Zeta 电位值可以是正值，也可以是负值，具体取决于封端剂的性质。

齐格勒-纳塔聚丙烯 – 它是指使用钛齐格勒-纳塔催化剂生产的聚丙烯，通常以氯化镁负载固体的形式制造，并用烷基铝活化。此过程通常在多种技术中使用。

齐格勒-尼科尔斯调谐方法 – 它是一种广泛使用的启发式技术，用于调整 PID（比例积分微分）控制器。 它提供了一种系统方法，用于根据受控系统的行为确定比例积分微分参数（比例增益、积分时间和微分时间）的初始值。 该方法旨在实现稳定且响应灵敏的控制系统，通常是通过找到产生持续振荡的增益，然后使用这些振荡来计算比例积分微分参数。

ZigBee协议 – 它被定义为一种无线通信标准，专为短期、低能耗应用而设计，主要是在物联网 (IoT) 中，利用电气和电子工程师协会 IEEE 802.15.4 基本协议。支持协调器、路由器、终端设备等多种设备类型，促进高效的网络管理和通信。

之字形配置 – 是指连接三个单相变压器的方法，通过以锯齿形方式构造绕组，为零序负载电流提供通路，有效处理不平衡负载和接地故障情况。

之字形接地组 – 这些组用于为配电系统上的相地负载提供第四根电线。他们使用锯齿形变压器配置来以比星形-三角形变压器更有效的方式降低电压。

锯齿形变压器 – 它是多绕组三相变压器，有时用于接地。

锯齿形变压器绕组 – 它是一种具有锯齿形或“互连星形”连接的专用变压器绕组，这样每个输出都是两 (2) 个相位偏移 120 度的矢量和。它用作接地变压器，从未接地的三相系统中创建缺失的中性点连接，以允许该中性点接地到接地参考点，执行谐波抑制，因为它们可以抑制三重（第3次、第9次、第15次和第21次等）谐波电流，作为自耦变压器提供三相电源（用作没有隔离电路的初级和次级），并提供非标准、相移三相电源。九绕组三相变压器通常具有三个初级绕组和六个相同的次级绕组，可采用锯齿形绕组连接。

锌（Zn） – 它是一种原子序数为 30 的化学元素。它在室温下是一种稍脆的金属，去除氧化后具有闪亮的灰色外观。在某些方面，锌的化学性质与镁 (Mg) 相似，两种元素仅显示一种正常氧化态 (+2)，并且 Zn2+ 和 Mg2+ 离子的大小相似。锌比铁（钢的主要成分）更具反应性。 当暴露于湿气和氧气时，锌会形成氧化锌、氢氧化锌和碳酸锌的保护层，粘附在表面并阻止进一步腐蚀。 锌的风化速度非常慢，因此涂层通常具有很长的使用寿命。锌比铁具有更大的电负性，因此为钢提供阴极（或牺牲）保护。如果涂层碎裂或损坏而暴露基底金属，除了充当电流保护器之外，这会导致锌优先于钢腐蚀。锌有五种稳定同位素。最常见的锌矿石是闪锌矿（闪锌矿），它是一种硫化锌矿物。锌通过矿石泡沫浮选、焙烧和最终用电提取（电积）进行精炼。较纯的锌有板状、锭状、丸状、粉末状和粉末状。板锌分为三个等级。当锌用于合金化目的时，杂质限制非常重要。超过杂质限度会导致机械和腐蚀性能较差。纯锌丸主要用于电镀锌浴的添加剂，锌粉和锌粉用于电池和改进的耐腐蚀涂料。

锌空气电池 – 这些电池被定义为电化学电池，采用锌粉阳极、催化阴极和碱性电解质，其中大气氧充当活性阴极。它们以高储能容量和平坦的放电曲线而闻名，但由于漏气，它们的使用寿命通常较短，只有 1 个月至 3 个月。

锌合金铸件 – 锌合金广泛用于重力压铸和压力压铸。当用作通用铸造合金时，锌合金可采用高压铸造、低压铸造、砂型铸造、金属型铸造（铁型、石墨型或石膏型）、旋转铸造（硅橡胶型）、熔模（失蜡）铸造、连续或半连续铸造、离心铸造等工艺铸造。较新的工艺涉及半固态铸造，其中可以使用多种技术。对于大多数应用来说，腐蚀并不重要。然而，对于遭受中度至重度腐蚀的铸件，预计会出现一些性能损失。长期老化也会造成一些小的性能损失；不同合金的效果各不相同，并且取决于所使用的铸造方法。所有锌铸合金都具有优异的加工性能，具有长刀具寿命、低切削力、良好的表面光洁度、低刀具磨损和小切屑形成。对这些合金进行的常见加工操作包括钻孔、攻丝、铰孔、拉削、铣削、车削、铣削、板牙螺纹加工和锯切。锌合金铸件可以通过软焊或钎焊或使用锌基填料的某些焊接技术方便地连接。不建议使用镉基、锡基或铅基焊料，因为它们会促进晶间腐蚀问题，除非铸件在焊接前镀有厚厚的镍或铜涂层。新型锌基焊料正在上市。粘合剂或机械紧固件也是连接铸件的绝佳方法。锌铸件可以铆接、铆接和卷边。螺纹紧固件（包括自攻螺钉）不得拧得太紧，而应拧紧至推荐扭矩。对于在 50 摄氏度或更高的高温下运行的零件，设计中将考虑高达 40% 的扭矩损失。通过使用特殊紧固件，包括正确的锥形垫圈（弹簧或贝氏垫圈）或星形垫圈，可以避免大量的扭矩损失。

锌合金电镀 – 这是一种通常通过电镀将锌基合金薄层涂覆到金属物体上的过程，以提高其耐腐蚀性、耐磨性和外观。 该涂层提供了一个牺牲层，保护下面的金属免受生锈和其他形式的腐蚀。 电镀中常用的锌合金包括锌镍合金和锌铁合金。

氯化锌铵 – 它是镀锌工艺清洗阶段使用的助焊剂溶液的典型成分。

闪锌矿 – 它是硫化锌 (ZnS) 的矿物形式，具有立方晶体结构。 它也被称为闪锌矿，是一种常见的锌硫化矿。 闪锌矿的锌原子与硫原子的比例为1:1，离子呈四面体排列。

锌溴液流电池 – 定义为一种以溴化锌水溶液为主要反应物，具有高能量密度、大容量、长寿命充放电的液流电池。它允许频繁的 100% 深度放电而不影响性能。其设计提高了安全性和可回收性。

锌锻烧 – 它是硫化锌精矿与其他初级或次级含锌材料在炉中高温焙烧或用空气鼓风反应的产物。

碳酸锌铜绿 – 它是随着镀锌涂层风化而形成的相对不溶的碳酸锌层，提供额外的腐蚀保护和耐磨性。

锌碳电池 – 这是一种原电池，利用锌作为阳极，二氧化锰作为阴极，氯化铵或氯化锌作为电解质。它为多种应用提供了经济的电源和可接受的性能。

锌铸造合金 – 锌铸造合金具有枝晶/共晶微观结构。亚共晶合金以富锌（eta）枝晶凝固，而过共晶合金以富铝枝晶凝固。至关重要的是，所有锌铝合金铸造合金都必须小心处理，以防止过量吸收铅、镉、锡和铁等有害杂质元素。在用于铸造铜和铝合金或铁的熔炉中熔化合金所引起的交叉污染特别麻烦，因为这些合金含有对锌合金有害的元素。出于对纯度的考虑，生产商要求在铸造锌合金的生产中只能使用 100% 的原生材料。在铸件制造过程中，最多 50% 的铸造返回熔炉的重熔是可以接受的。锌合金熔点低，需要相对较低的热输入，不需要助熔剂或保护气氛，并且无污染。锌压铸件固有的快速冷却速率会导致性能和尺寸随时间发生微小变化，特别是如果铸件是从模具中淬火而不是空气冷却的话。尽管这很少成为问题，但如果要满足严格的尺寸公差，则可以在使用前进行稳定化热处理。热处理温度越高，所需的稳定时间越短，100℃是防止铸件起泡或其他问题的实际限制。 A common treatment consists of 3 hours to 6 hours at 100 deg C, followed by air cooling. The time extends to 10 hours to 20 hours for a treatment temperature of 70 deg C. Because of their high fluidity, zinc alloys can be cast in much thinner walls than other die castings alloys, and they can be die-cast to tighter dimensional tolerances. Zinc alloys allow the use of very low draft angles. In some cases, a zero draft angle is possible.

Zinc castings – These castings refer to components fabricated through the die-casting process using zinc alloys, characterized by their ability to be produced rapidly, with intricate detail, tight dimensional tolerances, and excellent surface finish. They are known for their thin-wall casting capability, good machinability, and receptiveness to different finishing techniques, making them widely applicable in industries such as automotive and electronics.

Zinc chloride (ZnCl2) – It is a chemical compound composed of zinc and chlorine. It is a white, crystalline, and hygroscopic solid that readily absorbs moisture from the air. It is highly soluble in water and has several industrial applications, including use as a flux, dehydrating agent, and in textile and paper processing.

Zinc coated sheet and strip – In this the sheet and strip are coated with zinc (i) by dipping in a bath of molten zinc with the mass of the zinc varies in general between 100 grams per square meter to 700 grams per square meter total on both the sides and the coating having a spangle, minimized spangle, or without spangle finish, and (ii) by electrolytic deposition with the mass of the zinc varying in general between 7 grams per square meter and 107 grams per square meter on each side corresponding to a coating thickness of 1 micro-meter to 15 micro-meters on each side. After zinc coating, the surfaces can be passivated by chromating or phosphating.

Zinc-coated steel – It is also known as galvanized steel. It is steel that has been coated with a layer of zinc to protect it from corrosion. This coating acts as a barrier, preventing the steel from rusting when exposed to moisture and oxygen. The zinc also provides sacrificial protection, meaning it corrodes preferentially to the steel if the coating is damaged.

Zinc coating – It is a protective layer of zinc applied to a metal surface, typically steel, to prevent corrosion (rusting). This process, frequently called galvanizing, uses zinc’s ability to act as a sacrificial anode, meaning it corrodes preferentially to the underlying metal, hence protecting it from rust. The use of zinc as a coating to protect steel and iron from corrosion is the largest single application for the metal worldwide. Metallic zinc coatings are applied to steels namely (i) from a molten metal bath (hot dip galvanizing), (ii) by electrochemical means (electro-galvanizing), (iii) from a spray of molten metal (metallizing), and (iv) in the form of zinc powder by chemical / mechanical means (mechanical galvanizing). Zinc coatings are applied to several different types of products, ranging in size from small fasteners to continuous strip to large structural shapes and assemblies.

Zinc-cobalt plating – Zinc-cobalt coatings contain 0.6 % to 2 % cobalt. Zinc-cobalt alloys find extensive use for relatively inexpensive components in applications which need improved abrasion resistance and corrosion protection. Typically, an 8 micrometers film with 1 % cobalt lasts up to 500 hours in a neutral salt spray test before red rust appears if the proper chromate is applied. Some reduction in corrosion resistance is experienced after exposure to high temperature, but not as much as with zinc-iron alloys. A unique attribute of zinc-cobalt is its corrosion resistance to sulphur di-oxide in accelerated corrosion tests. This suggests that these coatings can be suitable for use in sulphur-containing corrosive environments. There are two types of zinc-cobalt plating baths namely acid and alkaline. Alkaline baths are preferred for tubes and other configurations with internal unplated areas. Exposure to acidic electrolyte reduces the corrosion resistance of such parts. Available chromates include clear, yellow, iridescent and black.

Zinc concentrate – It is a processed mineral material containing a high concentration of zinc, typically extracted from zinc ore through beneficiation processes like flotation. It is a crucial intermediate product used in the production of metallic zinc and different zinc-containing products.

Zinc deposits – These deposits refer to the different morphological forms of zinc which are plated from aqueous alkaline electrolytes, which can include heavy spongy, dendritic, filamentous mossy, boulder, and layer-like structures, each influenced by factors such as substrate type, surface treatment, electrolyte composition, and current density. For practical applications, well-adherent boulder or layer-like deposits are preferred, while other forms can hinder performance in battery cycling.

Zinc di-alkyl-di-thio-phosphate (ZDDP) – It is a chemical compound widely used as an anti-wear and antioxidant additive in lubricants, particularly in engine oils. It’s a coordination compound consisting of zinc bound to the anion of a di-alkyl-di-thio-phosphoric acid. Zinc di-alkyl-di-thio-phosphates are known for their ability to form protective tribo-films on metal surfaces under friction, which reduces wear and extends the life of engine components.

Zinc dust – It is a fine powder composed of metallic zinc. It is characterized by its bluish-gray colour and is used as a reducing agent, a pigment in corrosion-resistant coatings, and in several industrial applications. It is produced by condensing zinc vapour and is frequently spherical in shape.

Zinc electrode – It is defined as a component in nickel-zinc battery technology, typically composed of zinc oxide mixed with additives like calcium oxide, which improve conductivity and anti-corrosive properties, while also influencing discharge product solubility and cell energy density.

Zinc flake coatings  – These are non-electrolytically applied coatings, which provide good protection against corrosion. These coatings consist of a mixture of zinc and aluminium flakes, which are bonded together by an inorganic matrix. The specifications for zinc flake coatings are defined in International Organization for Standardization standard ISO 10683 and also in European standard EN 13858. ISO 10683 sets out the requirements for zinc flake coatings for threaded fasteners and EN 13858 describes the requirements for zinc flake coatings for fasteners with no thread and for other parts as well. There are three groups of zinc flake coatings namely (i) zinc flake coatings containing Cr (VI) (hexavalent chromium) with surfaces containing Cr (VI) provide higher anti-corrosion protection with a thinner coating, but Cr (VI) is carcinogenic and poses a potential risk to the environment, (ii) solvent-based Cr (VI)-free zinc flake coatings, and (iii) water-based Cr (VI)-free zinc flake coatings.

Zinc flake powder – It is made from spherical zinc powder by dry ball milling with lubricants. Zinc flake powder has stronger covering, floating and shielding properties as well as better metallic lustre than spherical zinc powder.

Zinc-ion battery (ZIB) – It is defined as energy storage device which utilizes zinc as the charge carrier, offering advantages such as low cost, environmental friendliness, safety, and a long life cycle compared to lithium-ion batteries. They feature high volumetric energy density and operate with aqueous electrolytes, avoiding issues like dendrite formation.

Zinc hydroxide  – It is the corrosion product formed in response to the presence of moisture on galvanized articles.

Zinc-iron alloy layers  – These are inner layers of the galvanized coating formed from interdiffusion reactions between iron in the base steel and molten zinc metal, (e.g., delta, gamma, and zeta layers).

Zinc-iron plating – It is a process where a thin layer of zinc alloyed with a small amount of iron is deposited onto a metal substrate, typically steel. This alloy coating provides improved corrosion resistance compared to plain zinc plating and is frequently used as an alternative to cadmium plating. The iron content in the coating is normally between 0.4 % and 1 % by weight. Zinc-iron plating involves depositing a layer of zinc alloyed with iron onto a metal surface. The iron content in the deposit is a key factor in its properties. Zinc-iron plating produces alloys containing 15 % to 25 % iron (Fe) as-plated. Advantages of this alloy are good weldability and ductility. It is electroplated on steel coil and strip for auto bodies. Strip for the manufacture of automotive components is also plated in baths that produce 1 % Fe in the alloy deposit, a special feature of this alloy is its suitability for deep black chromating. The corrosion resistance of zinc-iron is normally lower than that of the other zinc alloys, especially after exposure to high temperatures such as those encountered by under-the-hood automotive components.

Zinc mine – It is defined as a location where zinc ores, which typically contain 5 % to 15 % zinc, are extracted for processing and production of zinc metal. The majority of zinc mines are operated underground, with some utilizing open pit methods.

Zinc nickel (Zn-Ni) – It is an alloy coating, typically composed of 85 % to 88 % zinc and 12 % to 15 % nickel, used to protect metal surfaces from corrosion. This alloy is applied through electro-plating, where a layer of zinc-nickel is deposited onto a base metal, normally steel, using an electric current. This coating offers superior corrosion resistance compared to zinc alone, particularly in demanding environments.

Zinc-nickel alloy – Zinc-nickel alloys produce the highest corrosion resistance of electroplated zinc alloys. These alloys contain from 5 % to 15 % nickel. Corrosion resistance improves with nickel content up to 1 % to 18 %. Beyond this range the alloy becomes more noble than steel and loses its sacrificial protection property. An alloy containing 10 % to 13 % nickel is electro-plated on steel strip and coil as an alternative to zinc-iron or electro-galvanizing. An advantage of this composition is the formability of the steel after coiling. For components, chromatizing is needed. However, best results are achieved on alloys containing 5 % to 10 % nickel Ni. For alloys in this range of nickel content, corrosion resistance to neutral salt spray reaches 1000 hours or more before red rust. An advantage of zinc-nickel alloys is their retention of 60 % to 80 % of their corrosion resistance after forming and after heat treatment of plated components. This attribute makes these alloys suitable for automotive applications such as fasteners, brake and fuel lines, and other under-the-hood components.

Zinc-nickel alloy coated sheet and strip – In this product sheet or strip is coated electrolytically with a zinc-nickel alloy, with a coating thickness normally between 1 micro-meter to 8.5 micro-meters per side.

Zinc-nickel alloys plating – Zinc-nickel alloys plated from alkaline baths have shown potential as substitutes for cadmium coatings. Available chromates are clear, iridescent, bronze, and black. Alkaline formulations are preferred for their ease of operation and since they provide more uniform alloy composition and better overall corrosion resistance, especially on tubing and on internal configurations of parts.

Zinc ore – It is a naturally occurring rock or mineral deposit containing zinc, a metallic element used in several industrial applications. It is not found as a pure metal in the earth, but rather as compounds like zinc sulphide (sphalerite), zinc carbonate (smithsonite), and zinc silicate. These ores are mined and processed to extract the zinc metal.

Zinc oxide  – Combined with oxygen, zinc is available as zinc oxide powder. Zinc oxide is used as a pigment in primers and finish paint, as a reducing agent in chemical processes, and as a common additive in the production of rubber products. Zinc oxide is also the basic corrosion product formed almost instantaneously on freshly galvanized articles after withdrawal from the molten zinc metal.

Zinc oxide nano-particles – These nano-particles are defined as nano-structured zinc oxide materials which show unique properties different from their bulk counterpart, and they are utilized in several applications including chemical sensors, photo-catalysis, and opto-electronics because of their excellent structural, electrical, and optical characteristics.

Zinc patina  – It is relatively insoluble zinc carbonate layer which forms as the galvanized coating weathers, providing added corrosion protection and abrasion resistance.

Zinc phosphate coating – It is a type of chemical conversion coating used to treat metal surfaces, mainly steel, to improve corrosion resistance and improve the adhesion of subsequent coatings like paint. They are formed by reacting the metal surface with a phosphate solution, resulting in a crystalline layer of zinc phosphate. This layer acts as a barrier to corrosion and provides a good foundation for other finishes. Zinc phosphate coatings are inorganic, crystalline layers formed on metal surfaces through a chemical reaction.

Zinc plating – It is a process in which a thin layer of zinc is electroplated onto a metal substrate, typically steel or iron. The main purpose of zinc plating is to provide corrosion resistance to the underlying metal, helping prevent rust and degradation when exposed to moisture and air. The zinc layer acts as a sacrificial barrier, corroding first before the base metal does, offering protection over time. The plating process is relatively simple and cost-effective, making it widely used in manufacturing. Zinc Plating also provides a smooth, shiny finish which improves the aesthetic appearance of the product. It is frequently used in industries such as automotive, construction, and electronics.

Zinc powder – It refers to a finely divided form of metallic zinc, typically with particles ranging from sub-micron to a few hundred micro-meters in size. This powder is used as a raw material to create several components and products through powder processing techniques. The high surface area of zinc powder makes it reactive and suitable for several applications, including chemical reactions and as a component in batteries.

Zinc refining – It is defined as a process mainly involving electrolysis to recover metallic zinc from ores, with techniques such as electro-winning representing over 80 % of global zinc production. It also includes the recovery of by-products such as indium and other minor metals through electrolytic methods.

Zinc-rich paint  – It is also called cold galvanizing. It is the material used to touch-up and or repair hot-dipped galvanized surfaces, providing barrier protection and some cathodic protection (if the concentration of zinc is above 94 % in dry film thickness).

Zinc smelting – It is defined as the process of extracting zinc metal from its ores, mainly through methods such as roasting zinc concentrates to produce zinc oxide, which is then reduced by carbon in furnaces at high temperatures. This process includes various techniques like blast furnace processing and use of vertical retorts to efficiently produce zinc.

Zinc solder  – It is the material which is used to touch-up and / or repair hot-dip galvanized surfaces.

Zinc spelter – It typically refers to impure zinc, frequently in the form of slabs, got from the reduction of zinc ores. It is a commercially available form of zinc but contains impurities like lead and sometimes copper. Zinc spelter can also refer to a zinc-lead alloy which resembles bronze in appearance when aged.

Zinc stearate – It is a fine, white powder which acts as a lubricant. It is used to reduce friction during the pressing and compacting of metal powders, which helps prevent die wear and improves the flow of powder into the die cavity. This results in a more consistent and defect-free powder compact, known as a green compact.

Zinc sulphate – It is a chemical compound with the formula ZnSO4, normally known as white vitriol. It is an inorganic compound. It forms hydrates ZnSO4.nH2O, where ‘n’ can range from 0 to 7. All are colourless solids. The most common form includes water of crystallization as the heptahydrate, with the formula ZnSO4·7H2O.

Zinc sulphide (ZnS) – It is a naturally occurring inorganic compound with the chemical formula ZnS. It is a white, crystalline material which is normally found as the mineral sphalerite. Pure zinc sulphide is white, but it can appear black because of the impurities. It has several applications, including use as a pigment, in optics, and as a component in electronic devices because of its luminescent properties.

Zinc sulphide films – These are thin layers of the compound zinc sulphide (ZnS) which are used in several opto-electronic and optical applications because of their unique properties. These films are known for their wide band-gap, high refractive index, and ability to transmit light in the visible and infrared spectrum.

Zinc sulphide nano-particles – These nano-particles are defined as nano-scale structures of zinc sulphide which show unique morphologies, such as one-dimensional nano-wires and three-dimensional micro-spheres, and possess significant opto-electronic properties, making them suitable for applications in solar cells and photo-detectors.

Zinc worms – These are surface imperfections, characteristic of high-zinc brass castings, which occur when zinc vapour condenses at the mould / metal interface, where it is oxidized and then becomes entrapped in the solidifying metals.

Zincrometal – It is a steel coil-coated product consisting of a mixed-oxide underlayer containing zinc particles and a zinc-rich organic (epoxy) topcoat. It is weldable, formable, paintable, and compatible with normally used adhesives. Zincrometal is used to protect outer body door panels in automobiles from corrosion.

Zircon  – It is a mineral belonging to the group of nesosilicates and is a source of the metal zirconium. Its chemical name is zirconium (IV) silicate, and its corresponding chemical formula is ZrSiO4. An empirical formula showing some of the range of substitution in zircon is (Zr1-y, REEy)(SiO4)1-x(OH)4x-y. Zircon precipitates from silicate melts and has relatively high concentrations of high field strength incompatible elements. For example, hafnium is almost always present in quantities ranging from 1 % to 4 %. The crystal structure of zircon is tetragonal crystal system. The natural colour of zircon varies between colourless, yellow-golden, red, brown, blue, and green.

Zirconia – It is also known as zirconium dioxide (ZrO2). It is a white crystalline oxide of zirconium. It is a versatile material with applications ranging from jewelry to dental implants and even nuclear reactors. It is also known as a popular diamond simulant called cubic zirconia.

Zirconia grain stabilization – It refers to the process of preventing the phase transformation of zirconium di-oxide (zirconia) from its tetragonal or cubic form to its monoclinic form at lower temperatures by adding a stabilizing agent like yttria. This transformation can cause a substantial volume expansion and lead to cracking and failure of the material. By stabilizing the tetragonal or cubic phase, the material’s strength and toughness are improved, making it more durable and suitable for several applications.

Zirconia refractories  – These are refractories mainly composed of zirconium oxide (ZrO2). They are frequently used for glass furnaces since they have low thermal conductivity, are not easily wetted by molten glass and have low reactivity with molten glass. These refractories are also useful for applications in high temperature construction materials.

Zirconia toughened alumina (ZTA) – It is a composite material made from alumina and zirconia. It combines the outstanding characteristics of both materials. Compared to conventional alumina, zirconia toughened alumina possesses superior hardness, higher flexural strength, and similar density. Compared to conventional zirconia, it possesses a lower coefficient of linear thermal expansion and higher thermal conductivity. By leveraging these features, zirconia toughened alumina has been widely adopted in milling parts and wear-resistant parts which need cooling. Zirconia-toughened is frequently used in structural applications, cutting tools, and medical devices.

Zirconium (Zr) – It is a chemical element having atomic number 40. Pure zirconium is a lustrous transition metal with a greyish-white colour that closely resembles hafnium and, to a lesser extent, titanium. It is solid at room temperature, ductile, malleable and corrosion-resistant. The mineral zircon is the most important source of zirconium. Besides zircon, zirconium occurs in over 140 other minerals, including baddeleyite and eudialyte. Majority of zirconium is produced as a byproduct of minerals mined for titanium and tin. Zirconium forms a variety of inorganic compounds, such as zirconium dioxide, and organometallic compounds, such as zirconocene dichloride. Five isotopes occur naturally, four of which are stable. The metal and its alloys are mainly used as a refractory and opacifier. The properties of zirconium indicate that it is ductile and has useful mechanical properties similar to those of titanium and austenitic stainless steel. Zirconium has excellent resistance to several corrosive media, including super-heated water, and it is transparent to thermal energy neutrons. Because of these properties, zirconium is used in water-cooled nuclear reactors as cladding for uranium fuel. In 1958, zirconium became available for industrial use and began to supplant stainless steel as a fuel cladding in commercial power station nuclear reactors. Also, the chemical-processing industries began to use zirconium in several severe corrosion environments. Zirconium also finds uses in flashbulbs, biomedical applications and water purification systems. Zirconium alloys are used to clad nuclear fuel rods because of their low neutron absorption and strong resistance to corrosion, and in space vehicles and turbine blades where high heat resistance is necessary.

Zirconium alloys – These are defined as metallic materials mainly composed of zirconium, frequently alloyed with elements such as tin, niobium, chromium, iron, and hafnium. These alloys are used extensively in the nuclear industry for applications like fuel cladding, fuel channels, and structural components in water-cooled reactors. These alloys, including Zircaloy-1, Zircaloy-2, and Zircaloy-4, are selected for their superior corrosion resistance and mechanical properties under reactor conditions.

Zirconium alloy welding – Zirconium alloys are weldable with procedures and equipment are similar to those used for welding titanium and austenitic stainless steels. Zirconium has a low coefficient of thermal expansion, which contributes to low distortion during welding. Because of the reactivity of zirconium with oxygen, nitrogen, and hydrogen, the metal is to be shielded during welding with high-purity inert gas or a good vacuum. Also, zirconium is to be free of oil, grease, and dirt to avoid the dissolving of carbon-containing and oxygen-containing materials, which can embrittle the metal or create porosity and can reduce the corrosion-resistant properties of the metal. Zirconium and its alloys are available in two general categories namely commercial grade and reactor grade. Commercial-grade zirconium designates zirconium which contains hafnium as an impurity. Reactor-grade zirconium designates zirconium from which majority of the hafnium has been removed to make it suitable for nuclear reactor applications. Since pure zirconium has relatively low mechanical properties, different alloying elements are added to enhance its mechanical properties. Zirconium and its alloys are available in plate, sheet, bar, rod, and tubing form in a variety of material specifications.

Zirconium alloy welding process – Zirconium alloys are highly reactive to oxygen and nitrogen in air at high temperatures. Hence, the selected welding processes and procedures are to be capable of shielding the weldment and heat-affected zones (HAZ) from contamination. The use of fluxes is normally avoided, since reactivity with the chemicals in the fluxes causes brittleness and can reduce the corrosion resistance of zirconium weldments. The welding processes which can be used for welding are (i) gas tungsten arc welding, (ii) gas metal arc welding, (iii) plasma arc welding, (iv) electron beam welding, (v) laser beam welding, (vi) friction welding, (vii) resistance welding, (viii) resistance spot welding, and (ix) resistance seam welding. The selection of a welding process depends on several factors, e.g., weld joint, tensile and corrosion-resistant property requirements, cost, and design configuration. Gas-tungsten arc welding is very widely used process for joining zirconium alloys. It uses techniques similar to those used for welding stainless steel, i.e., the direct current power supply is connected for straight polarity (electrode negative, DCEN). Two desirable features are a contactor for making and breaking the arc and high-frequency arc starting. Plasma arc welding is also commonly used, especially for autogenous welding of butt joint thicknesses from 3 millimeters to 1.5 millimeters. Gas-metal arc welding is occasionally used for joint thicknesses from 3 millimeters or more, because of its more-rapid weld time and the consequent savings in shielding gas and production time. Weld quality is more difficult to maintain, because of weld spatter and arc instability, which result in weld contamination and weld defects. Electron-beam welding is rarely used, because of high equipment operating cost as well as weld chamber size limitations. Laser-beam welding has had very limited use in joining zirconium and has been applied mainly in nuclear reactors. Friction welding is used to join zirconium tubes to zirconium rods, as well as to dissimilar metal alloys (e.g., zirconium to stainless steel) for heat-exchanger applications. Resistance welding is especially useful for the seam or spot welding of thin sheets, since no shielding is needed.

Zirconium carbide (ZrC) – It is a hard, refractory ceramic material known for its high melting point, high thermal and electrical conductivity, and strong chemical resistance. It has a metallic gray colour and a cubic crystal structure. It is frequently used in aerospace and nuclear applications because of its strength and ability to maintain properties at high temperatures.

Zirconium carbide cermets -These are composite materials combining the hardness of zirconium carbide (ZrC) ceramic with the toughness and ductility of a metallic component, typically a metal like nickel, cobalt, or tungsten. These materials are engineered to leverage the beneficial properties of both ceramic and metallic phases, resulting in materials with high temperature strength, wear resistance, and fracture toughness.

Zirconium casting – It refers to the process of creating zirconium or zirconium alloy components by melting the metal and pouring it into a mould to solidify into the desired shape. This technique is similar to titanium casting, but zirconium alloys are more reactive at high temperatures, needing careful process control. Zirconium casting utilizes two melting methods namely vacuum arc skull melting and vacuum induction melting. Both furnace systems are capable of melting all reactive alloys. Castings can be produced with the receiving moulds in a static mode as well as by centrifugal casting. Centrifugal casting is accomplished by mounting the moulds on a turntable. This setup utilizes a centre sprue with a runner system to feed from the outside of the mould in. The mould is filled against the centrifugal forces, allowing a slower fill rate and reducing the potential for entrapped gases in the casting.

Zirconium di-boride  (ZrB2) – It is a highly covalent refractory ceramic material with a hexagonal crystal structure. Zirconium di-boride is an ultra-high temperature ceramic (UHTC) with a melting point of 3,246 deg C. This along with its relatively low density of around 6.09 grams per cubic centimeters (measured density can be higher because of hafnium impurities) and good high temperature strength makes it a candidate for high temperature aerospace applications such as hypersonic flight or rocket propulsion systems. It is an unusual ceramic, having relatively high thermal and electrical conductivities, properties it shares with iso-structural titanium di-boride and hafnium di-boride. Zirconium di-boride parts are normally hot pressed (pressure applied to the heated powder) and then machined to shape. Sintering of zirconium di-boride is hindered by the  material’s covalent nature and presence of surface oxides which increase grain coarsening before densification during sintering. Pressure-less sintering of zirconium di-boride is possible with sintering additives such as boron carbide and carbon which react with the surface oxides to increase the driving force for sintering but mechanical properties are degraded compared to hot pressed zirconium di-boride. Additions of around 30 volume percent silicon carbide (SiC) to zirconium di-boride is frequently done to improve oxidation resistance through silicon carbide creating a protective oxide layer which is similar to aluminum’s protective alumina layer.

Zirconium oxide based cermets – Zirconia is a ceramic material which can be bonded with metal to give useful refractory products. Even when combined with only small quantities of metal, such as 5 % to 15 % titanium, strong and thermal shock resistant materials suitable for crucibles to melt rare and reactive metals can be produced. If the zirconium oxide is combined with molybdenum, the resulting cermet shows excellent corrosion resistance against molten steel, in addition to high-temperature strength and limited sensitivity to thermal shock, especially when the metal content is around 50 % by volume. Thermocouple sheaths for temperature measurements of metallic melts, extrusion dies used for forming non-ferrous metals, and wear resistant parts made from these cermets with somewhat higher ceramic content, such as 60 % by volume, are some of the applications.

Zirconium oxide refractory – It consists of refractory products consisting substantially of zirconium di-oxide. It is known for their high temperature resistance and chemical stability. Zirconium oxide casting r efractories are used in several high-temperature applications, including furnace linings, crucibles, and casting nozzles, because of their exceptional properties.

Zirconium powder – It is a fine, particulate form of the metallic element zirconium. It’s typically a grayish-white or bluish-black powder, depending on its purity and form, and is characterized by its high flammability in its dry state. Zirconium powder can be produced through various methods and is used in a wide range of applications, including pyrotechnics, explosives, and as a component in alloys.

Zirconium oxy-chloride (ZrOCl2) – It is a chemical compound used in textile treatments, particularly in fire retardant applications, frequently combined with citric acid and hydrochloric acid. It is utilized to improve the flame resistance of materials like wool fabric under specified conditions.

Zirconium titanate – It is also called lead zirconate titanate (PZT). It is defined as a ceramic perovskite material. It is known for its significant piezo-electric properties, which enable it to change shape when an electric field is applied. It is widely used in many industrial applications because of its high performance, low loss, and versatility in fabrication into different forms.

Zircon refractory – It consists of refractory products consisting substantially or entirely of crystalline zirconium orthosilicate (ZrSiO4). Zircon refractories are specialized ceramic materials known for their exceptional resistance to high temperatures and chemical corrosion. These materials are widely used in industries like metallurgy, glass manufacturing, and ceramics because of their ability to withstand harsh conditions without substantial degradation.

ZK60 alloy – It refers to a magnesium alloy which is known for its limited precipitation hardening and is improved in strength through the co-addition of minor elements such as calcium (Ca) and erbium (Er), resulting in ultra-high tensile and yield strengths.

Z-mill – It is also known as a Sendzimir mill. It is a type of cold rolling mill known for its ability to produce high-quality, thin-gauge steel sheets and plates with precise tolerances and surface finishes. It achieves this through a unique design featuring multiple small-diameter work rolls backed by a series of larger backup rolls. This configuration allows for high rolling forces and precise control over the rolling process, resulting in minimal surface defects and consistent thickness.

Zonal safety analysis (ZSA) – It is defined as a tool in the system safety process which examines the proximity aspects of individual system installations and assesses the potential for mutual influence between systems installed in close proximity.

Zone  – It typically refers to a defined area or region within a system, structure, or process which is distinguished by specific characteristics or functionalities. These zones can be created for different purposes, such as designating different areas within a building for specific uses, defining areas of risk in hazardous environments, or establishing regions with specific regulations or tolerances.  In geology, zone is an area of distinct mineralization. Zone is also any group of crystal planes that are all parallel to one line, which is called the zone axis.

Zone axis – In crystallography, it is a crystallographic direction which is parallel to the intersection line of two or more crystal planes. Essentially, it is the direction along which these intersecting planes align.

Zone control – It is a feature in conveyor systems where different zones of the conveyor can be controlled independently, allowing for better energy efficiency and product handling.

Zoned heating – It refers to a system that divides a furnace into multiple temperature-controlled areas (zones) to optimize heating efficiency. Instead of heating the entire furnace to a single temperature, zoned systems allow for different temperatures in different areas, based on needs and preferences. This approach can lead to substantial energy savings.

Zone melting – It means highly localized melting, normally by induction heating, of a small volume of an otherwise solid metal piece, normally a metal rod. By moving the induction coil along the rod, the melted zone can be transferred from one end to the other. In a binary mixture where there is a large difference in composition on the liquidus and solidus lines, high purity can be attained by concentrating one of the constituents in the liquid as it moves along the rod.

Zone of oxidation  – It is the upper portion of an ore-body which has been oxidized.

Zone, primary combustion – In this zone of combustion, the primary combustion takes place. It is defined as the region within a combustion chamber where a portion of the air is mixed with fuel at an optimal air / fuel ratio, typically around 15:1, for facilitating efficient burning of the fuel. This zone is characterized by a toroidal vortex that stabilizes the flame and promotes the rapid ignition of fuel droplets.

Zone refining – It is a technique which is used to purify materials, especially metals and semiconductors, by repeatedly melting and solidifying a small zone of the material. Impurities tend to concentrate in the molten zone, leaving behind a purer solid as the zone moves. This process is repeated multiple times to achieve high levels of purity.

Zones concept, sintering – Typical sintering furnaces can be thought of as having three or more interconnected zones (depending on the powder material being sintered), each with a separate function. The sintering process consists of several sequential phases, each needing a unique combination of temperature, time and atmosphere composition, flow, direction, and circulation. Each phase of the sintering process occurs in a specific zone of the furnace. Separating these zones and phases conceptually improves design flexibility. A close match between the temperature and atmosphere of each zone and the function of each phase results in an optimum overall sintering process. In a single system, the base nitrogen can be modified with other gases or active ingredients to produce an appropriate and optimum atmosphere composition for each sintering phase before introduction into proper furnace zone.

Zone segregation – It refers to the separation of different groups or elements into distinct areas or zones. This can apply to different contexts, including social groups, waste management, and even network security.

Zone segregation, steel ingot – It refers to the uneven distribution of chemical elements or phases within the solidified metal, creating distinct zones with varying compositions. This occurs during the solidification process when some elements prefer to remain in the liquid phase while others solidify into the metal structure, leading to localized variations in composition. Zone segregation in the steel ingots cannot be eliminated completely by rolling or forging, though the shape of the segregated zone possibly can be changed, e.g., square-shape segregation frequently appears in the cross section of hot rolled steel. Hence, heat treatment distortion Is intensified because of this segregation.

Zone, sintering – In powder metallurgy, it consists of highly localized, progressive heating during sintering to produce a desired grain structure, such as grain orientation, and directional properties without subsequent working.

Zones, reheating furnace – A reheating furnace, used in steel and metalworking industries, is typically divided into three or more zones to gradually heat metal stock to the desired temperature. These zones are namely preheating zone, heating zone, and soaking zone. Each zone has specific functions and temperature profiles. Some furnaces can have more than one heating zone. In the preheating zone, the charged steel material is preheated. The role of the preheating zone is to increase the temperature of the steel material progressively. Slow heating of the steel surface initially is necessary for the control of the thermal stresses in the steel material. In the heating zone the surface temperature of the steel material is raised rapidly. The majority of heat absorption by steel material is accomplished in this zone. In the soaking zone, the internal temperature of the steel material is controlled so as to have as far as possible a uniform temperature throughout the cross section of the steel material. The temperature of this zone is progressively increased so as to have the target or desired discharging temperature for the steel material. In the reheating furnace, the major amount of heating takes place in the heating zone. The temperature uniformity up to desired limits between the core and the surface of the steel material is achieved in the soaking zone. The flue gases move in a direction opposite to that of the steel material and thus ensures considerable amount of waste heat recovery by convection in the preheating zone. Preheating zone is also sometimes called the recuperative zone. The velocity and the retention time of the exhaust gases in the furnace are important for the effective transfer of its sensible heat to the steel material.

Zoning – It is a device of land use planning. The word is derived from the practice of designating permitted uses of land based on mapped zones which separate one set of land uses from another. Zoning can be use-based (regulating the uses to which land can be put) or it can regulate building height, lot coverage and similar characteristics or some combination of these.

Zoom – In image processing, zoom refers to the geometric transformation which magnifies or reduces the size of an image. It is a way to make an image appear larger or smaller, frequently to reveal details or fit it within a display area. Zooming can be achieved through different methods, including optical zoom (using lens movement) and digital zoom (image processing).

Zoom scope sight – It is an optical device which uses a telescopic lens system to magnify a distant target. The ‘zoom’ aspect refers to the ability to adjust the magnification, typically through a variable power setting, to bring the target closer or further away visually.

Z-phase – It refers to different things depending on the context. In materials science, it typically describes a specific phase in metal alloys, frequently a complex nitride, or a phase formed in sodium-ion battery cathodes. In encoder systems, the Z-phase signal is a reset or origin signal. It can also refer to a phase in zeolites or a concept in photo–catalysis.

Z-pins – These are a type of reinforcement used in composite materials which improve strength in the through-the-thickness direction, improving resistance to delamination and enabling the creation of joints capable of withstanding higher mechanical loads.

Z-section – It is a structural component shaped like the letter ‘Z’. It is used mainly in construction for supporting roofs and walls. It is characterized by a central web and two flanges extending at opposing angles, providing strength and flexibility, especially in metal building framing. Z-sections are frequently used as purlins (for roofs) and girts (for walls) to support cladding and distribute loads evenly. The Z-shape provides a good strength-to-weight ratio and resistance to bending and torsion, making it suitable for spanning between main structural elements like rafters or trusses.

Z-transform – It is a mathematical operation which converts a set of evenly spaced measurements of an analog signal into a series of frequency components. It is a mathematical tool used to convert a discrete-time signal (a sequence of numbers) into a complex frequency-domain representation. It is analogous to the Laplace transform for continuous-time signals and is particularly useful for analyzing discrete-time systems and solving difference equations.

Zwitterion – It is also called an inner salt or dipolar ion. It is a molecule which contains an equal number of positively and negatively charged functional groups. Some zwitterions, such as amino acid zwitterions, are in chemical equilibrium with an uncharged ‘parent’ molecule.

Zwitterionic materials – These materials are defined as – that contain both positively and negatively charged groups, resulting in an overall neutral charge. They show strong hydrophilicity and antifouling properties because of the ionic structuring of water, which creates a hydrated layer which repels foulants.

Zwitterionic surfactant – It is defined as an amphiphilic organic compound which possesses both hydrophobic groups in its tail and hydrophilic groups in its head, which can substantially reduce interfacial tension in oil recovery applications.

Zylon  – It is is a trademarked name for a high-performance synthetic polymer material, specifically a range of thermoset liquid-crystalline poly-oxazole. Its IUPAC (International Union of Pure and Applied Chemistry) name is poly (p -phenylene-2,6-benzobisoxazole. In generic usage, the fibre is referred to as PBO. Zylon has 5.8 gigapascals of tensile strength, which is 1.6 times that of Kevlar. Additionally, Zylon has a high Young’s modulus of 270 gigapascals, meaning that it is stiffer than steel. Like Kevlar, Zylon is used in a number of applications which need very high strength with excellent thermal stability.