锌酸盐镀锌层的三价铬蓝色钝化  

Blue-bright passivation with trivalent chromium solution for zincate plating

作　　者：邹锦光[1] 曾振欧[1] 刘建平 赵国鹏 

机构地区：[1]华南理工大学化学科学学院,广州510640 [2]广州二轻工业科学技术研究所,广州510170

出　　处：《电镀与涂饰》2005年第11期40-42,55,共4页Electroplating & Finishing

摘　　要：以外观、醋酸铅点滴实验和中性盐雾实验(NSS)为评价标准,通过正交实验和单因素实验,得到了一种三价铬钝化膜的最佳工艺条件:0.1 mol/L CrC l3,0.2 mol/L有机羧酸CM,0.24 mol/L NaNO3,0.01 mol/L Co(NO3)2,8 g/L Na2S iO3,pH为1.2,钝化温度为10℃,钝化时间为30 s。探讨了配合物CM浓度、硝酸钠浓度、氯化铬浓度、硝酸钴浓度、硅酸钠浓度及钝化液pH、钝化温度、钝化时间的影响。在上述条件下得到的钝化膜呈蓝色,均匀,能通过48 h NSS实验。Using appearance, lead acetate spot test and neutral salt spray test （NSS） as evaluation criterions, according to orthogonal design method and one- way method, the optimal process conditions of a trivalent chromium passivation film was obtained ： 0.1 mol/L CrCl3 , 0.2 mol/L organic acid CM, 0.24 mol/L NANO3, 0.01 mol/L Co（ NO3 ） 2,8 g/L Na2SiO3 , pH 1.2, passivation temperature 10 ℃, passivation time 30 s. The influences of contents of composition CM, sodium nitrate, chromic chloride, cobah nitrate, sodium silicate, and passivating solution pH, passivation temperature, passivation time. The passivation film obtained under the above conditions has decorative blue-bright color, and can pass 48 h NSS test.

关 键 词：镀锌 三价铬 蓝色钝化 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TQ153.1[金属学及工艺—金属学]