Improvement in stannate chemical conversion coatings on AZ91 D magnesium alloy using the potentiostatic technique

被引：106
|
作者：
Elsentriecy, Hassan H. [1 ]
Azumi, Kazuhisa [1 ]
Konno, Hidetaka [1 ]
机构：
[1] Hokkaido Univ, Grad Sch Engn, Sapporo, Hokkaido 0608628, Japan
来源：
ELECTROCHIMICA ACTA | 2007年 / 53卷 / 02期
关键词：
AZ91; D; stannate; conversion coatings; corrosion resistance; potentiostatic technique;
D O I：
10.1016/j.electacta.2007.08.015
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The deposition of stannate chemical conversion coatings on AZ91 D magnesium alloy by using the potentiostatic technique was investigated to improve uniformity and corrosion protection performance of the coating film. It was found that anodic polarization during the stannate conversion process accelerated dissolution of magnesium ions and promoted deposition of the coating film. Optimal polarization potential was explored as a function of corrosion protection performance evaluated by potentiodynamic polarization curves in borate buffer solution. Scanning electron microscope observation and electrochemical corrosion tests of the stannate-coated samples confirmed significant improvement in uniformity and corrosion resistance of coatings deposited by the potentiostatic technique compared to those of coatings deposited by the simple immersion method. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1006 / 1012
页数：7
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