三价铬电镀铬镀层性能的研究  

Study on the properties of trivalent chromium coating

作　　者：王秋红[1] 潘湛昌[1] 胡光辉[1] 肖楚民[1] 古晓雁 

机构地区：[1]广东工业大学轻工化工学院,广东广州510006 [2]佛山市昭信金属制品有限公司,广东佛山528131

出　　处：《材料研究与应用》2010年第4期467-469,共3页Materials Research and Application

基　　金：广东省科技计划项目(2008B010600048);佛山市三水区科技计划资助项目(0903A)

摘　　要：对一种硫酸型三价铬镀层性能进行了分析,从镀层的结合力、耐腐蚀性、镀层晶态结构,微观形貌可知,三价铬镀层与基体有良好的结合能力,Tafel曲线测试结果表明,三价铬镀层的腐蚀电位高于六价铬镀层,XRD分析三价铬沉积铬为铬-铁镀层,这也是它耐腐蚀性的原因之一,SEM观察镀层表面形态为微型针孔,造成腐蚀电流略大于六价铬镀层.综合分析,三价铬镀层与六价铬镀层性能基本相当.In this paper,a sulfate trivalent chromium coating was studied.The properies of coating were analysed such as adhesive force,corrosion resistance,crystalline structure,microstructure. Results showed that the adhesive force of trivalent chromium coating was very good; The corrosion potential of trivalent chromium coating was much higher than hexavalent chromium coating by Tafel curve test; the trivalent chromium coating was a chromium-iron coating with XRD,it was also one of the reasons it had good corrosion resistance; the corrosion current was a little bigger as it had many tiny pinholes on surface topography by SEM. In a word,the properies of trivalent chromium coating and hexavalent chromium coating were basically same.

关 键 词：三价铬电镀 镀层 耐蚀性 Tafel曲线 

分 类 号：TQ153.1[化学工程—电化学工业]