033.733.002.S模块备件

033.733.002.S

1.范围
1.1本规范涵盖了自动催化的要求
（化学镀）水溶液中的镍磷镀层
工程（功能）用金属产品解决方案。
1.2涂层为镍和磷的合金，由次磷酸盐自催化化学还原产生。
因为沉积的镍合金是反应的催化剂，
这个过程是自我维持的。化学和物理
沉积物的性质主要取决于其磷
含量和随后的热处理。化学成分
电镀溶液的浓度和溶液的使用会影响
沉积物的孔隙率和耐腐蚀性。更多
详情见ASTM STP 265（1）2和参考文献（2）（3）（4）和（5）
还参考图。X1.1。X1.2和图。X1.3中
指南B 656的附录。
1.3涂层通常由在高温下运行的酸性溶液沉积而成。
1.4该工艺在表面上产生均匀厚度的涂层
不规则形状的零件，前提是镀液在其表面自由循环。
1.5涂层具有多功能特性
硬度、热淬透性、磨损、磨损和腐蚀
电阻、磁性和导电性提供扩散
以及可焊性。它们还用于打捞船只
磨损或加工不当的零件。
1.6低磷（2-4%P）涂层为微晶，具有较高的镀态硬度（620-750 HK）
100). 这些涂层用于需要耐磨损性的应用。
1.7在1至10%范围内的较低磷沉积物
3%的磷也是微晶。这些涂层是
用于电子应用中，提供可焊性、粘合性、导电性和耐腐蚀性
强碱溶液。
1.8中磷涂层（5-9%P）是常见的
广泛用于满足一般用途的磨损要求
以及耐腐蚀性。
1.9高磷（大于10%P）涂层
在各种环境中具有优异的耐盐雾性和耐酸性
应用。它们用于制造铍和钛零件
低应力特性。含磷涂料
大于11.2%的P不被认为是铁磁性的。
1.10以国际单位制表示的数值应视为：
标准
1.11以下预防说明仅适用于：
本规范第9节试验方法部分。这
本标准并非旨在解决所有安全问题，
如果有的话。这是用户的责任
以建立适当的安全和健康
并在使用前确定监管限制的适用性。
2.参考文件
2.1 ASTM标准：
B 368铜加速乙酸盐雾试验（CASS试验）的试验方法3
B 374与电镀相关的术语3
B 380腐蚀试验方法，采用腐蚀注释程序3
B 487测量金属和氧化物的试验方法
通过显微镜检查涂层厚度
横截面3
B 499用磁性法测量涂层厚度的试验方法：表面的非磁性涂层
磁性基础金属3
B 504用库仑法测量金属涂层厚度的试验方法3
B 537电镀板额定值的实施规程
对大气暴露3
B 567涂层厚度的测量方法
β反向散射方法3
B 568涂层厚度的测量方法
X射线光谱法3
1.本规范由ASTM金属委员会B-08管辖
粉末和金属粉末产品，并由工程涂料分委员会B08.08.01直接负责。
现行版本于1997年7月10日批准。1997年10月出版。原版
出版号为B 733-84。上一版B 733–90（1994年）。2.括号中的黑体数字指的是下列参考文献列表：
课文结束。3 ASTM标准年鉴，第02.05卷。

033.733.002.S

033.733.002.S

1. Scope 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) also refer to Figs. X1.1, Figs. X1.2, and Figs. X1.3 in the Appendix of Guide B 656. 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 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 and health practices and determine the applicability of regulatory limitations prior to use. 2. Referenced Documents 2.1 ASTM Standards: B 368 Test Method for Copper-Accelerated Acetic AcidSalt Spray (Fog) Testing (CASS Testing)3 B 374 Terminology Relating to Electroplating3 B 380 Test Method of Corrosion by the Corrodkote Procedure3 B 487 Test Method for Measurement of Metal and Oxide Coating Thicknesses by Microscopical Examination of a Cross Section3 B 499 Test Method for Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on Magnetic Basis Metals3 B 504 Test Method for Measurement of Thickness of Metallic Coatings by the Coulometric Method3 B 537 Practice for Rating of Electroplated Panels Subjected to Atmospheric Exposure3 B 567 Method for Measurement of Coating Thickness by the Beta Backscatter Method3 B 568 Method for Measurement of Coating Thickness by X-Ray Spectrometry3 1 This specification is under the jurisdiction of ASTM Committee B-08 on Metal Powders and Metal Powder Products and is the direct responsibility of Subcommittee B08.08.01 on Engineering Coatings. Current edition approved July 10, 1997. Published October 1997. Originally published as B 733 – 84. Last previous edition B 733 – 90 (1994). 2 The boldface numbers given in parentheses refer to a list of references at the end of the text. 3 Annual Book of ASTM Standards, Vol 02.05.