1.1 本规范描述了从水溶液沉积到工程（功能）用基材上的自动催化镍硼涂层的要求。本规范将这些涂层分为两类: 1.1.1 1类涂层 硼含量为0.1至小于3.5%（质量百分比），剩余镍。 1.1.2 2类涂层 硼含量为3.5%至6%（质量百分比），镍含量至少为90%（质量百分比）。 1.2 镍硼涂层是通过水溶液中的自动催化（化学）沉积产生的。 这些溶液包含烷基胺硼烷或硼氢化钠作为还原剂、镍离子源、缓冲液、络合剂和控制化学品。 1.3 即使在不规则形状的零件上，涂层也坚硬且厚度均匀，应用范围广泛。 1.4 用烷基胺硼烷配制的工艺溶液通常产生含有0.1至3.5的涂层 % 硼。这种类型的薄涂层可在电子元件上提供粘合性和可焊性，如引线框架、电触点和头。 为了保持可焊性，这些涂层通常不进行热处理。 1.5 用硼氢化钠配制的工艺溶液呈强碱性，常用于钢板和钛零件，以提高表面硬度和耐磨性。这些过程产生的沉积物可能包含3到5 % 硼和铊或其他金属，用于稳定电镀溶液和改变涂层性能。 1.6 这些沉积物的物理和机械性能（如密度、硬度、应力和熔点）将随硼含量而变化。 硼含量的变化也会影响热处理过程中析出的硼酸镍的数量和结构。在镀态条件下，镀层主要由镍和硼的非晶态混合物组成，硬度约为700 HKN。当沉积物加热到300以上时 °C时，镍结晶，形成Ni（111）的镍团簇，硼沉淀为硼酸镍，Ni 3. B（211）和（311），将硬度增加到1000 HK以上 100 对于2类涂层。 1.7 镍硼涂层为微孔，提供有限的防腐保护。然而，其柱状结构有助于减少磨损，因为它提供了一种将润滑剂截留在涂层零件表面内的方法。 1.8 本文件仅描述了在不使用外部电源的情况下生产的自动催化镍硼涂层。 1.9 单位- 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.10 以下危险警告仅适用于本规范的测试方法部分: 本标准无意解决与其使用相关的安全问题。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。 1.11 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 describes the requirements for coatings of autocatalytic nickel boron deposited from aqueous solutions onto substrates for engineering (functional) use. The specification classifies these coatings into two types: 1.1.1 Type 1 Coatings have a boron content of 0.1 to less than 3.5 mass percent with the balance nickel. 1.1.2 Type 2 Coatings have a boron content of 3.5 to 6 mass percent and a minimum of 90 mass percent nickel. 1.2 Nickel boron coatings are produced by autocatalytic (electroless) deposition from aqueous solutions. These solutions contain either an alkylamineborane or sodium borohydride as a reducing agent, a source of nickel ions, a buffer, complexant, and control chemicals. 1.3 The coatings are hard and uniform in thickness, even on irregular shaped parts, and used in a wide range of applications. 1.4 Process solutions formulated with an alkylamineborane usually produce coatings that contain 0.1 to 3.5 % boron. Thin coatings of this type provide bondability and solderability on electronic components such as lead frames, electrical contacts, and headers. To maintain solderability, these coatings are generally not heat treated. 1.5 Process solutions formulated with sodium borohydride are strongly alkaline and are frequently used to plate steel and titanium parts to impart surface hardness and wear resistance properties. Deposits produced from these processes can contain 3 to 5 % boron and thallium or other metals which are used to stabilize the plating solution and modify the coating properties. 1.6 The physical and mechanical properties of these deposits such as density, hardness, stress, and melting point will vary with the boron content. The variation of boron content also affects the quantity and structure of nickel boride precipitated during heat treatment. In the as-plated condition, the deposit consists of a predominantly amorphous mixture of nickel and boron with a hardness of about 700 HKN. When the deposit is heated above 300 °C, the nickel crystallizes, forming nickel clusters of Ni (111) and boron precipitates as nickel boride, Ni 3 B (211) and (311), increasing the hardness to greater than 1000 HK 100 for Type 2 coatings. 1.7 The nickel boron coatings are microporous and offer limited corrosion protection. Their columnar structure, however, is beneficial in reducing wear because it provides a means of trapping lubricants within the surface of the coated part. 1.8 This document describes only autocatalytic nickel boron coatings that have been produced without use of external electric sources. 1.9 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.10 The following hazards caveat pertains only to the Test Methods section of this specification: This standard does not purport to address the safety problems 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. 1.11 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.