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

YE Zhiguo;HE Qingqing;LANG Yun;CHEN Yibin;LIU Lei;CHEN Chuan;MA Guang;School of Material Science and Engineering Nanchang Hangkong University;State Grid Wenzhou Power Company;Smart Grid Research Institute of State Grid;  
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.
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