1.1 概述- 本规范涵盖了通过机械沉积在金属产品上的镉和锌混合物涂层的要求。涂层有四种厚度等级（见 表1 )和几种饰面类型（参见 表2 ). 1.2 毒性- 警告: 镉有毒；因此，这些涂层不应用于接触食物或饮料的物品，或可能插入口腔的牙科和其他设备。此外，涂层不应用于将被加热到高温的物品上，因为镉会形成有毒烟雾。同样，如果在制造过程中焊接、焊接或以其他方式加热涂层物品，则应提供足够的通风以排出有毒烟雾。 1.3 类似文件- 规范涵盖了其他类型的机械沉积涂层 B635 , B695 和 B696 . 1.4 以下预防性警告仅适用于试验方法部分第节 9 ，符合本规范。 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 6.1 耐腐蚀性，概述- 该功能涂层用于提供耐腐蚀性。这种涂层的性能在很大程度上取决于其厚度和暴露的环境类型。已公布的环境腐蚀研究结果表明，该涂层在工业环境中的耐蚀性大于锌涂层的等效厚度，在海洋环境中的耐蚀性大于镉涂层的等效厚度。 4. 6.2 耐电偶腐蚀性- 在腐蚀环境中导致钢和铝零件相互接触腐蚀的电偶也可以通过在钢零件上镀这种机械沉积涂层来最小化。 6.3 氢脆，无- 机械涂层工艺不会在由高硬度材料制成的产品中产生任何永久氢脆- 高强度钢，例如紧固件或锁紧垫圈。

1.1 General— This specification covers the requirements for a coating that is a mixture of cadmium and zinc deposited on metallic products by mechanical deposition. The coating is provided in four thickness classes (see Table 1 ) and several finish types (see Table 2 ). 1.2 Toxicity— Warning: Cadmium is toxic; therefore these coatings should not be used on articles that will contact food or beverages, or for dental and other equipment that may be inserted into the mouth. Also, the coatings should not be used on articles that will be heated to high temperatures, because cadmium will form toxic fumes. Similarly, if coated articles are welded, soldered, or otherwise heated during fabrication, adequate ventilation should be provided to exhaust toxic fumes. 1.3 Similar Documents— Other kinds of mechanically deposited coatings are covered by Specifications B635 , B695 , and B696 . 1.4 The following precautionary caveat pertains only to the test method portion, Section 9 , of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 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. ====== Significance And Use ====== 6.1 Corrosion Resistance, General— This functional coating is used to provide corrosion resistance. The performance of this coating depends largely on its thickness and the kind of environment to which it is exposed. Published results of environmental corrosion studies have demonstrated that the coating provides corrosion resistance greater than equivalent thicknesses of zinc coatings in industrial environments and greater corrosion resistance than equivalent thicknesses of cadmium coatings in marine environments. 4 6.2 Galvanic Corrosion Resistance— The galvanic couple that results in the corrosion of steel and aluminum parts in contact with each other in corrosive environments can also be minimized by plating the steel parts with this mechanically deposited coating. 6.3 Hydrogen Embrittlement, Absence of— The mechanical coating process does not produce any permanent hydrogen embrittlement in products made from high-strength steels, for example, fasteners or lock washers.