镀锌层无铬黑色钝化膜成分及其耐蚀性能  

Thecomposition and corrpsion resisitance of chromium-free black passivation film on electrodeposited zinc coating

作　　者：范云鹰[1] 施绍队[1] 周荣锋[1] 岑启宏[1] 李孟洋[2] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]西南交通大学地球科学与环境工程学院,成都611756

出　　处：《四川大学学报（自然科学版）》2012年第5期1043-1048,共6页Journal of Sichuan University(Natural Science Edition)

基　　金：云南省自然基金(KKS0200927011)

摘　　要：为解决铬酸盐对环境的污染以及人体的伤害,本文采用新研发的硅酸盐黑色钝化工艺代替铬盐黑色钝化工艺,在镀锌层表面形成一层乌黑油亮的钝化膜.通过中性盐雾试验和电化学实验测试表明该钝化膜可以大大的提高镀层的耐蚀性能;通过SEM和金相观测到钝化后镀层的表面质量得到很大的提高;通过X光电子能谱(XPS)分析表明钝化膜由Zn、O、N、S、P以及Si元素组成,其中硅元素以胶态的SiO_2和Zn_5Si_3O_7(OH)_2(PO_4)_2·4H_2O的形式存在,并据XPS对黑色钝化膜的形成作出简要分析.To avoid the environmental pollution and body＇s harm from the chromium salt, this paper uses a new silicate black passivation technology instead of the tradition chromate black passivation to form a thin black passivation film on the zinc coating. The neutral salt spray and the test of electrochemical experiments show that the corrosion resistance of passivation film has been greatly improved. Through SEM and microstructure, it is observed that the surface passivation＇s quality has been greatly improved. The X-ray photoelectron spectroscopy （XPS） analysis shows that the black passivation film contains Zn, O, N, S, P , Si and other elements, in which silicon exists in the form of colloidal SiO2 and Zn5 Si3 O7 （OH）2 （PO4）2 · 4H2O. There is also a brief analysis of the black passivation film＇s formation according to the XPS.

关 键 词：无铬钝化 黑色钝化膜 镀锌层 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]