电流密度对电沉积银石墨复合镀层耐蚀和耐磨性能的影响

The effect of current density on the corrosion resistance and wear resistance of electrodeposition silver-graphite composite coating

使用电沉积方法在铜基表面制备了银石墨复合镀层,研究了沉积电流密度对银石墨复合镀层耐蚀和耐磨性能的影响。研究表明,镀层的石墨面积分数随着沉积电流密度的上升而增大;沉积电流密度对自腐蚀电位的影响不大,沉积电流密度的增加使得自腐蚀电流密度增大;在0.1~0.5A/dm^2范围内,随着电流密度的增加,复合镀层的平均摩擦系数减小,磨损率先减小后增大。当沉积电流密度为0.3A/dm^2、搅拌速度为420r/min时,复合镀层的磨损率最小,为8.13×10^(-14) m^(-3)/N·m。该条件下制备的触头触指分合10 000次后,在触头的面状低副摩擦中,其镀层厚度迁移量小于2μm;在触指的线状高副摩擦中,其镀层磨损量小于10μm。

In this paper,the silver-graphite composite coatings were prepared on copper substrate by the electrodeposition method.The influence of deposition current density on the corrosion resistance and wear resistance of the silver graphite composite coating was particularly investigated.This study indicated that the area fraction of the coated graphite increased with the rise of deposition current density.The self-corrosion potential was less likely to be affected by deposition current density.However,the increase of deposition current density was to accelerate the self-corrosion current density.In 0.1-0.5A/dm^2 range,the average friction coefficient of composite coating decreased and the wear rate decreased and then increased by the increment of current density.When the deposition current density was equal to 0.3A/dm^2 and stirring speed to 420r/min,the wear rate of the coating reached the minimum,namely 8.13×10^-14 m^-3/N·m.After contact terminal and contact finger prepared in the condition off operation of 10 000 times,the migration amount of coating thickness for contact terminal in the planar low vice was less than 2μm and the abrasion loss in the linear high vice friction of contact finger was less than 10μm.