关于零件镀镍过程中针孔和麻点防止办法的探讨

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英文篇名：On the Way to Prevent Pinholes and Pits in Parts Nickel Plating Process 作者：刘伟 ; 高光辉 英文作者：LIU Wei;GAO Guang-hui;Shijiazhuang Aircraft Industry Co.,Ltd.; 关键词：镀镍 ; 针孔 ; 麻点 ; pH值 英文关键词：nickel plating;;pinhole;;pitting;;pH value 中文刊名：NRPJ 英文刊名：Internal Combustion Engine & Parts 机构：石家庄飞机工业有限责任公司; 出版日期：2018-02-28 出版单位：内燃机与配件 年：2018 期：No.256 语种：中文; 页：NRPJ201804048 页数：2 CN：04 ISSN：13-1397/TH 分类号：100-101

摘要

镍是银白色微黄的金属,具有磁铁性,密度8.9g/cm~3,熔点1453℃。在空气中与氧作用易生成一层极薄的钝化膜,能抵抗大气、碱和一些酸的腐蚀。镍在铁上属阴极性保护镀层。孔隙率高,只有当镀层超过25um时才基本无孔。因此不单独作为防护性镀层。常用来作为中间镀层,一般采用如铜/镍/铬等形式的组合镀层来提高防护装饰性能~([1])。本文讨论了高精度零件在镀镍过程中容易出现针孔和麻点的问题,并从工艺角度较全面地阐述了镀镍过程中针孔和麻点的防治办法。
        Nickel is a silvery white yellowish metal with a magnetism density of 8.9 g/cm~3 and a melting point of 1453℃. A very thin layer of passive film will form when Nickel acts with oxygen in the air, which can resist the corrosion of atmosphere, alkali and some acid.Nickel is a cathodic protection coating on iron. It has high porosity. Only when the coating is more than 25 um, there will be basically no holes. Therefore, it is not used as a protective coating singly, but usually used as the middle coating. Generally we use such combinations as copper/nickelromium plating to improve the protective performance. This article discussed the problem of pinhole and pits easily appearing in the process of nickel plating for high-precision parts, and explained the methods of prevention and control of pinholes and pits in the process of nickel plating from the technical point of view.

引文

[1]王玲,梅天庆.高级电镀工技术与实例[M].南京:江苏科学技术出版社,2005,10.
    [2]张允诚,胡如南,向荣.电镀手册[M].北京:国防工业出版社,1997.