1.1 本规范涵盖了电沉积纳米结构锌镍合金涂层的要求。当使用适当的阻隔涂层时，所述涂层可应用于铁和钢以及其它基底，例如不锈钢和铝青铜。 1.2 这些涂层旨在为石油和天然气、汽车和航空航天部件（例如紧固件、支架和外壳）提供腐蚀保护。该涂层也可用于需要增强耐腐蚀性的其它工业应用中。 1.3 这些涂层在各种具有挑战性的环境中提供耐用性和耐腐蚀性，从暴露在可变湿度的大气中、暴露在盐水条件下的近海和海洋环境，到汽车和航空航天应用中发现的温度波动和潜在化学相互作用的场景。附注1: 纳米结构锌镍合金涂层由于其纳米（10 -9 m)范围。除了纳米级颗粒之外，独特的无孔层状微结构(即，在化学蚀刻后观察到的层或条带)也有助于这种增强的保护。超细/纳米晶粒具有较高的比晶界表面积，增加了电偶电化学活性，导致增强的钝化响应。这种增强的钝化有助于在表面上形成更稳定的保护性氧化层，进一步减轻腐蚀。同时，无孔层状微结构用于增加耐腐蚀性和整体耐久性，同时允许释放氢。因此，与标准连续DC电沉积锌-镍涂层相比，纳米结构锌-镍涂层增强了电偶/阻挡性能。这些涂层的纳米结构性质的验证是通过微结构评估、腐蚀测试和开路电位（OCP）定期测试的组合来实现的，确保了加工方法的有效性。 附注2: 使用对DC电沉积工艺的调整获得纳米结构的超细晶粒尺寸，包括对施加的电流、特定浴化学、浴温度和其他参数的修改。详细方法见 附录X1 . 1.4 单位- 以SI单位表示的值应被视为标准。本标准不包括其他计量单位。1.5 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 1.6 本标准经过修订，符合有害物质限制（RoHS）要求，旨在限制工人和公众接触有毒金属。该合金不含六种限制有害物质中的任何一种。 1.7 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 requirements for electrodeposited nanostructured zinc-nickel alloy coatings. The coatings can be applied to iron and steel, as well as other substrates, such as stainless steel and aluminum bronze, when an appropriate barrier coating is used. 1.2 The coatings are intended to provide corrosion protection to oil and gas, automotive, and aerospace components such as fasteners, brackets, and housings. The coatings may also be used in other industrial applications in which enhanced corrosion resistance is desired. 1.3 The coatings provide durability and corrosion resistance in diverse challenging environments, ranging from atmospheric exposures with variable humidity, offshore and marine settings subjected to saline conditions, to scenarios with fluctuating temperatures and potential chemical interactions found in automotive and aerospace applications. Note 1: Nanostructured zinc-nickel alloy coatings exhibit superior corrosion resistance due to their ultrafine grain size in the nanometer (10 -9 m) range. In addition to the nanoscale grains, the unique non-porous laminar microstructure (that is, layers or banding observed after chemical etching) also contributes to this enhanced protection. The ultrafine/nanocrystalline grains, with their higher specific grain boundary surface area, increase galvanic electrochemical activity, leading to an enhanced passivation response. This heightened passivation helps in forming a more stable and protective oxide layer on the surface, further mitigating corrosion. Simultaneously, the non-porous layered microstructure acts to increase corrosion resistance and overall durability, while allowing for hydrogen relief. As a result, nanostructured zinc-nickel coatings enhance the galvanic/barrier properties compared to standard continuous DC electrodeposited zinc-nickel coatings. Validation of the nanostructured nature of these coatings is achieved through a combination of microstructure evaluation, corrosion testing, and open circuit potential (OCP) periodic testing, ensuring the effectiveness of the processing methods. Note 2: Nanostructured ultrafine grain sizes are obtained using adjustments to the DC electrodeposition process, including modifications to the applied current, specific bath chemistries, bath temperature, and other parameters. Detailed methods can be found in Appendix X1 . 1.4 Units— The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard. 1.5 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. 1.6 This standard has been revised to comply with the Restriction of Hazardous Substances (RoHS) Requirements that seek to limit the exposure of workers and the public to toxic metals. The alloy does not contain any of the six restricted hazardous substances. 1.7 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.