1.1 本规范涵盖了从水溶液应用到工程（功能）用金属产品的自动催化（化学）镍磷涂层的要求。 1.2 涂层是由次磷酸盐自动催化化学还原生成的镍和磷合金。因为沉积的镍合金是反应的催化剂，所以该过程是自我维持的。沉积物的化学和物理性质主要取决于其磷含量和随后的热处理。镀液的化学组成和使用会影响镀层的孔隙率和耐腐蚀性。 有关更多详细信息，请参阅ASTM STP 265 ( 1. ) 2. 和参考文献 ( 2. ), ( 3. ), ( 4. ), 和 ( 5. ) . 1.3 涂层通常由高温下的酸性溶液沉积而成。 1.4 只要电镀液在不规则形状的零件表面自由循环，该工艺可在不规则形状的零件上产生均匀厚度的涂层。 1.5 该涂层具有多功能特性，例如硬度、热淬透性、耐磨性、耐磨性和耐腐蚀性、磁性、导电性、提供扩散屏障和可焊性。它们还用于修复磨损或加工不当的零件。 1.6 低磷（2到4 % P） 涂层为微晶，具有较高的镀态硬度（620至750 HK 100）。这些涂层用于需要耐磨性的应用中。 1.7 较低的磷沉积在1 % 和3 % 磷也是微晶。这些涂层用于电子应用中，可提供可焊性、可粘合性、导电性增加以及对强碱溶液的耐受性。 1.8 中等磷涂层（5至9 % P） 最广泛的用途是满足一般用途的耐磨性和耐腐蚀性要求。 1.9 高磷（超过10 % P） 涂层在广泛应用中具有优异的耐盐雾性和耐酸性。它们用于铍和钛零件，以获得低应力性能。磷含量大于11.2的涂层 % P不被认为是铁磁性的。 1.10 单位- 以国际单位制表示的数值应视为标准值。 1.11 以下预防说明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。 1.12 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。

1.1 This specification covers requirements for autocatalytic (electroless) nickel-phosphorus coatings applied from aqueous solutions to metallic products for engineering (functional) uses. 1.2 The coatings are alloys of nickel and phosphorus produced by autocatalytic chemical reduction with hypophosphite. Because the deposited nickel alloy is a catalyst for the reaction, the process is self-sustaining. The chemical and physical properties of the deposit vary primarily with its phosphorus content and subsequent heat treatment. The chemical makeup of the plating solution and the use of the solution can affect the porosity and corrosion resistance of the deposit. For more details, see ASTM STP 265 ( 1 ) 2 and Refs ( 2 ), ( 3 ), ( 4 ), and ( 5 ) . 1.3 The coatings are generally deposited from acidic solutions operating at elevated temperatures. 1.4 The process produces coatings of uniform thickness on irregularly shaped parts, provided the plating solution circulates freely over their surfaces. 1.5 The coatings have multifunctional properties, such as hardness, heat hardenability, abrasion, wear and corrosion resistance, magnetics, electrical conductivity provide diffusion barrier, and solderability. They are also used for the salvage of worn or mismachined parts. 1.6 The low phosphorus (2 to 4 % P) coatings are microcrystalline and possess high as-plated hardness (620 to 750 HK 100). These coatings are used in applications requiring abrasion and wear resistance. 1.7 Lower phosphorus deposits in the range between 1 % and 3 % phosphorus are also microcrystalline. These coatings are used in electronic applications providing solderability, bondability, increased electrical conductivity, and resistance to strong alkali solutions. 1.8 The medium phosphorous coatings (5 to 9 % P) are most widely used to meet the general purpose requirements of wear and corrosion resistance. 1.9 The high phosphorous (more than 10 % P) coatings have superior salt-spray and acid resistance in a wide range of applications. They are used on beryllium and titanium parts for low stress properties. Coatings with phosphorus contents greater than 11.2 % P are not considered to be ferromagnetic. 1.10 Units— The values stated in SI units are to be regarded as standard. 1.11 The following precautionary statement 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. 1.12 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.