电镀锌钛/锆基无铬化学转化膜的制备与耐蚀性能  

Study on Preparing Technology and Corrosion Resistance of Ti/Zr Based Chromium-free Chemical Conversion Coating on Zinc Electroplating Layer

作　　者：管勇[1] 刘建国[1] 严川伟[1] 

机构地区：[1]中国科学院金属研究所金属腐蚀与防护国家重点实验室,辽宁沈阳110016

出　　处：《电化学》2010年第4期373-377,共5页Journal of Electrochemistry

基　　金：国家自然科学基金(21003141)资助

摘　　要：借助优化钛/锆基化学转化工艺,在碱性无氰镀锌层基体上获得了环保型的无铬转化膜,并与铬酸盐彩色钝化膜作对比.中性盐雾试验、动电位极化和电化学阻抗谱测试结果表明:钛/锆基化学转化膜出现白锈时间为96 h,达到铬酸盐彩色钝化膜标准,且呈现出较低的腐蚀电流和较高的极化电阻,但钝化特性不如铬酸盐彩色钝化膜明显.In this paper,we obtained environmental-friendly chromium-free chemical conversion coating on the non-cyanide alkaline zinc electroplating layer by employing the optimized Ti/Zr based conversion technique.At the same time,the performances of the Ti/Zr based conversion coating were compared with chromate colour passivation coating.The corrosion resistances of the conversion coatings were investigated by using neutral salt spray（NSS） test,potentiodynamic polarization and electrochemical impedance spectroscopy（EIS）.The results showed that the white rust appeared after 96 hours when the NSS test was performed on the Ti/Zr based conversion coating,which was close to the corrosion resistance rating of chromate colour passivation coating.Compared with the chromate passivation coating,the Ti/Zr based conversion coating showed lower corrosion current and higher polarization resistance.However,the passivation characteristic of the former was less evident than the latter.

关 键 词：电镀锌 无铬钝化 钛/锆基 盐雾试验 耐蚀性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]