镀锌层钼酸盐转化膜在NaCl溶液中的腐蚀行为  

Corrosion Behavior of Molybdate Conversion Film on Zinc Coating in NaCl Solution

作　　者：刘艳荣[1] 周婉秋[1] 武士威[1] 施耀萍[2] 

机构地区：[1]沈阳师范大学化学与生命科学学院,辽宁沈阳110034 [2]天津市轻工装备研究所,天津300193

出　　处：《电镀与精饰》2010年第12期10-13,共4页Plating & Finishing

基　　金：沈阳师范大学博士启动基金项目(BS200816);实验室主任基金资助项目(SY200706)

摘　　要：对电镀锌钢板进行钼酸盐钝化处理。研究了该钝化膜在3.5%NaCl溶液中的腐蚀行为。极化曲线测试结果显示:转化膜的腐蚀电位正移,腐蚀电流密度减小。转化膜的阻抗弧曲率半径明显增大。膜层较为均匀,表面无明显孔洞。盐雾试验结果表明:钼酸盐转化膜的耐腐蚀性能不如铬酸盐转化膜。A blue and shiny conversion film with uniform and c om pact characteristics was obtained by passivation treatment for electro-galvaniz ed steel plate in molybdate bath.The corrosion behavior of this film was invest igated in 3.5% NaCl using electrochemical methods.Polarization curve test resul ts showed that corrosion potential of the film shifted positively and the corr osion current density decreased.EIS measurement results illustrated that the r adius of impedance loop increased significantly.It could be found that the con version film was uniform and no visible holes existed on the film surface throug h high magnification optical microscope observation.The salt spray test results showed that the corrosion resistance of molybdate conversion film was inferior to that of chromate conversion film.

关 键 词：电镀锌钢板 钼酸盐转化膜 极化曲线 电化学阻抗谱 盐雾试验 

分 类 号：TG174.45[金属学及工艺—金属表面处理]