已有的光亮荆用于5,5-二甲基乙内酰脲为配位剂的无氰镀银体系,存在镀层形貌不好、外观不亮的缺陷,同时其组成也较复杂.为此对过去已用的光亮剂进行了筛选,最后确定以2,2-联吡啶作为无氰镀银体系的光亮剂.采用稳态极化曲线测量研究了加入2,2-联吡啶前后镀液的特性,通过SEM,XRD等测试技术对镀层形貌及结构进行了表征.结果表明,2,2-联吡啶光亮剂的加入可以增大镀液的极化,改变银镀层的晶体取向,显著细化晶粒,获得光亮的银镀层,使银镀层的耐磨性、防变色能力得到增强.
Based on screening of currently available brighteners used for cyanide - free Ag electroplating in plating bath with 5,5- dimethyl glycolylurea as the complexing agent, 2, 2-bipyridine was selected as the brightener for Ag electroplating. The characteristics of the plating baths with and without 2, 2-bipyridine were evaluated, and the morphology and microstructure of electroplated Ag coatings were analyzed by means of scanning electron microscopy and X - ray diffraction. Results indicate that 2,2- bipyridine as the brightener is able to accelerate polarization of the plating solution, change orientation of electroplated Ag coating and increase the brightness, wear resistance and anti - tarnishing capability of Ag coating.
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