铸锡青铜零件铜/银/镉镀层表面产生花斑的原因分析与改进措施
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摘要
滑靴组件表面电镀铜/银/镉后容易出现花斑,影响了产品的外观和耐蚀性。其主要原因是滑靴组件上铸锡青铜零件表面的砂眼在盐浴扩散焊接和电镀前处理过程中有盐分残留。电镀前采用由植酸、锡青铜缓蚀剂和分散剂组成的封闭剂处理不仅可以有效解决花斑问题,而且能在保证镀层结合力的前提下提高零件的耐蚀性。
Some spots often occurred on the surface of skid shoe assemblies after electroplating copper, silver, and cadmium successively, which affected the appearance and corrosion resistance of products. The main reason of this problem is the existence of sand holes in the tin bronze cast part, where some salts remain during the salt bath diffusion welding and pretreatment process for electroplating. The problem was solved by treatment with a sealing agent composed of phytic acid, corrosion inhibitor for tin bronze casting, and dispersant prior to electroplating. The corrosion resistance of product was also improved on the premise of a qualified adhesion of coatings.
Some spots often occurred on the surface of skid shoe assemblies after electroplating copper, silver, and cadmium successively, which affected the appearance and corrosion resistance of products. The main reason of this problem is the existence of sand holes in the tin bronze cast part, where some salts remain during the salt bath diffusion welding and pretreatment process for electroplating. The problem was solved by treatment with a sealing agent composed of phytic acid, corrosion inhibitor for tin bronze casting, and dispersant prior to electroplating. The corrosion resistance of product was also improved on the premise of a qualified adhesion of coatings.
引文
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[2]许德明,刘平,吉桂英.铸锡青铜与巴氏合金抗粘附磨损的实验研究[J].润滑与密封, 2003, 28(2):47-48, 51.
[3]魏莉莉,黄一雄.转子及滑靴组件的扩散焊工艺研究[J].航空维修与工程, 2016(2):48-49.
[4]SABETGHADAM H, HANZAKI A Z, ARAEE A. Diffusion bonding of 410 stainless steel to copper using a nickel interlayer[J]. Materials Characterization,2010, 61(6):626-634.
[5]YUAN X J, TANG K L, DENG Y Q, et al. Impulse pressuring diffusion bonding of a copper alloy to a stainless steel with/without a pure nickel interlayer[J].Materials and Design, 2013, 52:359-366.
[6]刘强,林乃明,沙春鹏,等.钢铁材料电镀镉的研究现状[J].表面技术, 2017, 46(1):146-157.
[7]李迎丽,赵燕,杜长权.钢制实体保持架镀银表面缺陷分析[J].轴承, 2017(1):35-36, 53.
[8]王宗雄,倪孝平,鲍新华,等.镀层封闭剂的应用[J].电镀与涂饰, 2016, 35(16):886-889.
[9]南海洋,刘慧丛,李卫平,等.烧结NdFeB材料镀层失效的分析和预防[J].表面技术, 2017, 46(4):12-15.
[10]郭子成,罗青枝,荣杰.润湿现象和毛细现象的热力学描述[J].大学物理, 2000, 19(6):19-21.
[11]张允诚,胡如南,向荣,等.电镀手册[M]. 4版.北京:国防工业出版社, 2011:676-681.