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针对一批铜质触头表面镀金层变色的案例,采用扫描电镜和能谱仪分析了合格品(未变色)和异常品(变色)表面镀层的微观形貌、镀层厚度和镀层成分,发现异常品镀层变色是由于供货厂家在镀金原材料中混入银杂质所致。
Aiming at some cases of discoloration of gold plating on the surface of copper contacts, the microstructure, coating thickness and coating composition of the surface coatings of unqualified products (discoloration) and abnormal products (discoloration) were analyzed by scanning electron microscopy and energy dispersive spectroscopy. Abnormalities were found Product coating discoloration is due to suppliers in the gold-plated raw materials mixed with silver impurities.