环保无氰电镀银镀层在人工汗液中的耐腐蚀性能研究

Corrosion Property of Environment-Friendly Cyanide Free Electroplating Silver Coating in Artificial Sweat

采用环保无氰络合剂体系制备Ag镀层,以使用硫代硫酸盐络合剂体系制备的Ag镀层作为对照,并运用多种手段对比了两种镀层的性能。通过X-射线衍射、扫描电镜对镀层晶体结构和表面形貌行了表征;采用接触角测试评价了镀层表面状态;利用阳极极化曲线、交流阻抗测试研究了Ag镀层在人工汗液中的腐蚀行为。结果表明:环保无氰电沉积法制备的Ag镀层与使用硫代硫酸盐络合剂制备的镀层比较,镀层晶面取向从(200)晶面为主转变为以(111)晶面为主;镀层平整、晶粒细致;润湿性显著提高;交流阻抗测试结果与阳极氧化结果一致,显示镀层在人工汗液中的耐腐蚀性能明显提高。

Ag coating was prepared by environment-friendly cyanide free complexing agent system.Compared with Ag coating prepared by hyposulfite complexing agent,properties of the Ag coating were investicated by various means.The crystal structure and surface morphology of the coating were characterized by X-ray diffraction and scanning electron microscope;the surface state of the coating was evaluated by contact angle test;the corrosion behavior of Ag coating in artificial sweat was studied by anodic polarization curve and AC impedance test.The results show that the Ag coating prepared by environment-friendly cyanide free electrodeposition transforms from(200)crystal planes to(111)crys-tal planes,and the coating is smooth and the grain size is fine;the wettability is much better.The results of AC impedance test and immersion coupon test are consistent with those of anodic polarization test,which shows corrosion resistance of the coating is obviously improved.