KI体系下制备纯银镀层和纯银/银石墨复合镀层的性能

Properties of Pure Silver Coating and Pure Silver/Silver-Graphite Composite Coating Prepared in KI System

在KI体系下使用电沉积方法在铜基体表面分别制备了纯银镀层和纯银/银石墨复合镀层,研究了两种镀层的结合力、耐磨性、耐蚀性、热导率和电阻率。结果表明:在KI体系下制备的纯银镀层和纯银/银石墨复合镀层与铜基体的结合力都达到GB/T 5270-2005标准要求;纯银/银石墨复合镀层的平均摩擦因数和磨损率分别为0.178和2.457×10-11 mm3·N-1·m-1,远远小于纯银镀层的0.515和6.501×10-11 mm3·N-1·m-1,其耐磨性优于纯银镀层的,但其耐蚀性比纯银镀层的差;纯银/银石墨复合镀层的热导率明显优于纯银镀层的,电阻率高于纯银镀层的。

Pure silver coating and pure silver/silver-graphite composite coating were prepared on the surface of copper substrate by the method of electro-deposition in a system of KI.The adhesion strength,wear resistance,corrosion resistance,thermal conductivity and resistivity of the pure silver coating and pure silver/silver-graphite composite coating were investigated.The adhesion strength of the pure silver coating and pure silver/silver-graphite composite coating on copper substrate met the requirement of GB/T 5270-2005 standard.The average friction coefficient and wear rate of the pure silver/silver-graphite composite coating were 0.178 and 2.457×10-11 mm3·N-1·m-1 respectively,much less than those of pure silver coating,0.515 and 6.501×10-11 mm3·N-1·m-1.The pure silver/silver-graphite composite coating exhibited better wear resistance and worse corrosion resistance compared with the pure silver coating.The thermal conductivity of the pure silver/silver-graphite composite coating was obviously better than that of the pure silver coating,but the resistivity of the pure silver/silver-graphite composite coating was higher than that of the pure silver coating.