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采用复合电沉积制备了Ag/纳米金刚石复合镀层,研究了沉积条件对镀层组成的影响,所得最佳沉积条件为阴极电流密度jk=8mA/cm2、搅拌速度n=400r/min和镀液中纳米金刚石粉体浓度为10g/L。采用扫描电镜（SEM）、X射线衍射（XRD）和能谱分析（EDS）表征了Ag/纳米金刚石复合镀层的表面形貌、组成和结构。结果表明,复合镀层具有复相结构,金刚石颗粒在镀层中分布较均匀,质量含量最高达到9wt%。显微硬度和电阻测试表明,随着Ag/纳米金刚石复合镀层中金刚石含量增加,复合镀层显微硬度显著增大;电阻率呈增加趋势。在5.0wt%Na2SO4溶液的Tafel实验说明,Ag/纳米金刚石复合镀层比Ag镀层具有更好的耐腐蚀能力。Ag/纳米金刚石复合镀层具有较好的结合力,外观呈亚光银。

Ag/nano-diamond composite coating was prepared using electro-deposition technique in a composite electrolyte,and at the same time the effect of plating condition on the coating composition was investigated.The best plating conditions obtained in this study are the cathode current density jk=8mA/cm2,the stirring rate n=400r/min and the nano-diamond powder concentration 10g/L.The surface morphology,the composition and the structure of the composite coating were characterized by scanning electron microscopy(SEM),energy disperse spectroscopy(EDS) and X-ray diffraction(XRD).The results show that that the coating has dual phase structure,the diamond powders spread uniformly within the coating,and the diamond content reaches the highest value of 9wt%.The micro-hardness rises observably and the electrical resistance tends to increase with increasing diamond content.TheTafel test in 5.0wt% Na2SO4 indicated thatthe corrosion resistance of the Ag/nano-diamond composite coating is superior to Ag coating.With semi-bright appearance,the composite coating has a good bonding.