银-石墨烯复合镀层的制备及镀层性能

Preparation and Performance of Ag-Graphene Composite Coatings

为了解决刀闸触头材料不耐磨的问题,以丁二酰亚胺无氰镀银工艺在紫铜表面复合电沉积了银-石墨烯复合镀层。采用现代表面分析技术,研究了石墨烯浓度、电流密度对复合镀层表面质量及形貌的影响,给出了复合镀层的沉积模型,并对复合镀层的结合力、耐磨性、电学性能进行了分析。结果表明:当石墨烯浓度为0.5 g/L、电流密度为0.6 A/dm^2时,可以得到具有优异性能的银-石墨烯复合镀层,硬度达到125 HV,具有较低的摩擦系数、小磨痕宽度和较优的导电性;在中性介质3.5%NaCl中,银-石墨烯复合镀层的自腐蚀电位低,且容易形成钝化膜,可防止其进一步腐蚀。银-石墨烯复合镀制备的新型电接触材料在高压隔离开关中具有广阔的应用前景。

In order to improve the wear resistance of the switch contact material,silver-graphene composite coating was prepared on copper by composite electrodeposition with succinimide cyanide-free silver plating system.The effects of graphene concentration and current density on the surface quality and morphology of the composite coating were studied by modern technology of surface analysis.In addition,the deposition process model of the coating was given,and the adhesion,wear resistance and electrical properties of the coating were analyzed.Results showed that when the concentration of graphene was 0.5 g/L and the current density was 0.6 A/dm^2,the as-prepared silver-graphene composite coating had excellent properties,such as hardness of 125 HV,lower friction coefficient,smaller wear scar width and better electrical conductivity.In the neutral medium of 3.5%NaCl,the self-corrosion potential of sliver-graphene composite coatings was small,and the passivation film easily formed,which could prevent further corrosion.Therefore,the new type of electrical contact material prepared with sliver-graphene composite coating had broad application prospects in high voltage disconnectors.