无裂纹电镀铬出现裂纹的原因分析

Analysis on formation of cracks in electroplated crack-free chromium coating

针对某无裂纹电镀铬产品出现裂纹的问题,采用电感耦合等离子体质谱法(ICP-MS)和离子色谱法(IC)分析了问题镀液的杂质含量,并进行了一系列的实验研究。结果表明,镀液中Cu^2+的质量浓度高达666.0 mg/L,电镀过程中铜件掉入镀液,并与镀液中六价铬反应导致有三价铬生成是本次故障的主要原因,给出了解决和预防措施。

As for the problem of cracks formed in crack-free chromium-electroplated products,the contents of different impurities in the failed electroplating bath were analyzed by inductively coupled plasma mass spectrometry(ICP-MS)and ion chromatography,and some experiments were conducted.It was found that the mass concentration of Cu^2+was up to 666.0 mg/L.The problem was mainly caused by the fall of copper parts into the bath which reacted with hexavalent chromium,forming trivalent chromium.Some countermeasures and prevention measures were given.