钼对Zn-Fe合金镀层耐蚀性的影响  

Influence of Molybdenum on Corrosion Resistance of Zn-Fe Alloy Coating

作　　者：曹超[1] 鲁道荣[1] 

机构地区：[1]合肥工业大学化学工程学院,安徽合肥230009

出　　处：《金属功能材料》2007年第5期12-16,共5页Metallic Functional Materials

基　　金：安徽省教育厅自然科学研究项目(050601D2)

摘　　要：电镀液中加入钼盐，在A3钢表面电镀zn-Fe合金薄膜，研究钼对Zn-Fe合金镀层耐蚀性能的影响。采用稳态法、交流阻抗法和循环伏安法研究Zn-Fe合金镀层在30℃的0．20mol／LH2SO4溶液中的腐蚀行为，用SEM和XRD研究钼对镀层在腐蚀前后微观结构的影响。结果表明：加入钼盐，能改变Zn-Fe合金镀层的晶面择优取向和织构系数，使结晶粒度变小，当钼盐加入量为0．90～1．50g／L时，镀层变得均匀、致密、光亮度较好，镀层的致钝电流密度（ipp）和维钝电流密度（ip）降低，极化电阻增大，使Zn-Fe合金镀层在硫酸溶液中的耐蚀性能增强。The effects of molybdenum salt on the corrosion resistance of zinc-iron alloy coating which was electroplated on the surface of A3 steel substrate from various electrolytes of molybdenum salt were investigated. The corrosion behavior of the zinc-iron alloy coating was studied by the galvanostatic method, cyclic voltammetry and electrochemical impendenee chat in the 0. 20mol/L sulfuric acid solution of 30℃. The influence of molybdenum on the mierostrueture of zinc-iron alloy coating before and after corrosion was studied by SEM and XRD. Experiment results indicate that the crystallization cell size of zinc-iron alloy coating was changed smaller, zinc-iron alloy coatings were changed uniformly and close together, the zinc-iron alloy coatings orientation texture coefficient was changed, the ipp and ip of zinc-iron alloy coating was reduced, Rp increased, the corrosion resistance of the zinc-iron alloy deposit was strengthened in sulfuric acid solution when molybdenum salt of 0. 90- 1. 50g/L added in electrolytes.

关 键 词：钼 ZN-FE合金 电镀 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]