化工学报2011，Vol.62Issue(10)：2861-2866,6.DOI:10.3969/j.issn.0438-1157.2011.10.026
以6063铝合金为基底的三价铬与锆杂化转化膜的制备及其电化学特征
Preparation and electrochemical characteristics of trivalent chromium-zirconium hybrid coatings on 6063 aluminum alloy
摘要
Abstract
To improve the corrosion resistance of trivalent chromium coatings, trivalent chromium-zirconium hybrid coatings were prepared on 6063 aluminum alloy by using chromic potassium sulfate and zirconium sulfate, and phosphoric acid. Polarization curves and electrochemical impedance spectroscopy (EIS) were used to investigate the electrochemical characteristics of chromium-zirconium hybrid coatings formed in plating solutions of different concentrations of zirconium sulfate, and better corrosion resistance was confirmed. Compared with the coatings without zirconium sulfate plating and bare aluminum alloy, polarization curves showed that the hybrid coatings formed in 0. 8-1. 2 g ? L-1 Zr(SO4)2 plating solution had more positive corrosion potential, and lower corrosion current density. Electrochemical parameters of EIS indicated that the hybrid coatings had higher resistance and charge transfer resistance. The morphology and composition of the coatings were examined by SEM and EDS, respectively. The results showed that the morphology of coatings remained almost unchanged and the coatings mainly consisted of Cr, Zr, P, and O after addition of zirconium sulfate, and the chromium-zirconium hybrid coatings were formed on 6063 Al alloy.关键词
材料失效与保护/钝化/腐蚀电化学/铝合金/三价铬/耐蚀性能Key words
material failure and protection/ passivation/ corrosion electrochemistry/ aluminum alloy/trivalent chromium/ corrosion resistance分类
矿业与冶金引用本文复制引用
余会成,袁爱群,韦冬萍,谭学才,韩燕燕..以6063铝合金为基底的三价铬与锆杂化转化膜的制备及其电化学特征[J].化工学报,2011,62(10):2861-2866,6.基金项目
广西产业重大科技攻关工程(1114003-2) （1114003-2）
广西民族大学引进人才科研启动基金(2009QD024). （2009QD024）
