1.1 本规范涵盖了铁、钢和其他金属产品上电沉积镉涂层的要求。 注1: 镉主要以涂层的形式沉积在钢铁产品上。它也可以电沉积在铝、黄铜、铍铜、铜、镍和粉末冶金零件上。 1.2 该涂层以电沉积或补充饰面的形式提供各种厚度，最高可达25μm（含25μm）。 1.3 镉涂层用于基础金属部件的耐腐蚀和防腐。在温和或无腐蚀性环境中，早期形成白色腐蚀产物不会对部件的功能造成损害或有害，因此，沉积涂层（I型）可用于最低成本的保护。电镀镉上补充铬酸盐饰面（II型和III型）的主要目的是提高耐腐蚀性。 铬酸盐将延缓或防止在暴露于各种环境条件下的表面上形成白色腐蚀产物，并延缓基底金属腐蚀的出现。 1.4 在航空航天工业中，镀镉用于最大限度地减少高强度钢紧固件和铝之间的双金属腐蚀。紧固件零件上的螺纹无需底切，因为镉涂层的摩擦系数较低，可降低所需的拧紧力矩，并允许重复拆卸。 1.5 镀镉零件可以在不使用腐蚀性焊剂的情况下轻松焊接。镀镉的钢部件具有比镀锌的钢更低的电接触电阻。镉镀层的润滑性用于门和门闩的弹簧以及在高湿度下运行的织机。镉上形成的腐蚀产物粘附性很强。 与锌不同，镉不会在表面形成大量腐蚀产物。这允许在运动部件、螺纹组件、阀门和精密机构的腐蚀性暴露期间正常工作，而不会被碎屑卡住。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification covers the requirements for electrodeposited cadmium coatings on products of iron, steel, and other metals. Note 1: Cadmium is deposited as a coating principally on iron and steel products. It can also be electrodeposited on aluminum, brass, beryllium copper, copper, nickel, and powder metallurgy parts. 1.2 The coating is provided in various thicknesses up to and including 25 μm either as electrodeposited or with supplementary finishes. 1.3 Cadmium coatings are used for corrosion resistance and for corrosion prevention of the basis metal part. The as-deposited coating (Type I) is useful for the lowest cost protection in a mild or noncorrosive environment where early formation of white corrosion products is not detrimental or harmful to the function of a component. The prime purpose of the supplementary chromate finishes (Types II and III) on the electroplated cadmium is to increase corrosion resistance. Chromating will retard or prevent the formation of white corrosion products on surfaces exposed to various environmental conditions as well as delay the appearance of corrosion from the basis metal. 1.4 Cadmium plating is used to minimize bi-metallic corrosion between high-strength steel fasteners and aluminum in the aerospace industry. Undercutting of threads on fastener parts is not necessary as the cadmium coating has a low coefficient of friction that reduces the tightening torque required and allows repetitive dismantling. 1.5 Cadmium-coated parts can easily be soldered without the use of corrosive fluxes. Cadmium-coated steel parts have a lower electrical contact resistance than zinc-coated steel. The lubricity of cadmium plating is used on springs for doors and latches and for weaving machinery operating in high humidity. Corrosion products formed on cadmium are tightly adherent. Unlike zinc, cadmium does not build up voluminous corrosion products on the surface. This allows for proper functioning during corrosive exposure of moving parts, threaded assemblies, valves, and delicate mechanisms without jamming with debris. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.