不同三价铬溶液体系镀铬工艺及镀层性能比较  

Comparison of chromium plating process and deposit properties from different trivalent chromium electrolytes

作　　者：王伟[1] 曾振欧[1] 谢金平 李树泉 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640 [2]广东致卓精密金属科技有限公司,广东佛山528247

出　　处：《电镀与涂饰》2013年第9期9-13,共5页Electroplating & Finishing

摘　　要：为了帮助电镀企业选择适合的三价铬镀铬体系,通过实验探讨了3种已获应用的三价铬镀铬溶液体系(硫酸盐、氯化物和硫酸盐–氯化物)与六价铬镀铬溶液体系在镀铬过程中镀液性能、镀层外观色泽和性能之间的差异。结果表明,3种三价铬镀铬体系的电流效率均高于六价铬镀铬体系,所得铬镀层与镍镀层的结合力均好,但镀层硬度较低。其中,硫酸盐镀铬体系的分散能力和覆盖能力最好,得到合格镀层的电流密度范围最宽,所得铬镀层外观色泽乌亮,其耐蚀性与六价铬镀铬相当,但镀速较慢。硫酸盐–氯化物溶液体系镀速较快,电流效率最高;氯化物溶液体系次之,所得铬镀层外观色泽均白亮,但耐蚀性稍差。The difference of the bath property as well as the appearance, color, luster and performance of chromium deposit obtained from three types of applied trivalent chromium baths including sulfate, chloride, and sulfate- chloride systems from that prepared from a hexavalent chromium plating bath was discussed to help the electroplating corporations selecting suitable trivalent chromium plating system. The results proved that the cathodic current efficiency of all the trivalent chromium plating systems is higher than that of the hexavalent chromium plating system. The adhesion of trivalent chromium deposits to nickel deposit is good, while the hardness is relative low. The sulfate trivalent chromium plating system features the highest throwing power and covering power, the widest current density range over which an eligible chromium deposit is obtained, but relatively low deposition rate, and produces deposits with glossy black appearance and comparable corrosion resistance to the hexavalent chromium deposit. The sultate-chlortoe tnvalent chromium plating system has advantages of fast plating rate and highest current efficiency, which are better than the chloride system. The deposits obtained from the sulfate-chloride and chloride systems are white and bright, but has a slightly poor corrosion resistance.

关 键 词：镀铬 硫酸盐 氯化物 镀层性能 

分 类 号：TQ153.11[化学工程—电化学工业]