Improvement in stannate chemical conversion coatings on AZ91 D magnesium alloy using the potentiostatic technique
Improvement in stannate chemical conversion coatings on AZ91 D magnesium alloy using the potentiostatic technique
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DOI：
10.1016/j.electacta.2007.08.015
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发表时间：
2007-12-01
影响因子：
6.6
通讯作者：
Konno, Hidetaka
中科院分区：
文献类型：
--
作者：
Elsentriecy, Hassan H.;Azumi, Kazuhisa;Konno, Hidetaka
研究了采用恒电位法在az91d镁合金表面沉积锡酸盐化学转化涂层，以提高涂层的均匀性和防腐性能。发现锡酸盐转化过程中的阳极极化加速了镁离子的溶解，促进了镀层的沉积。利用动电位极化曲线评价硼酸盐缓冲溶液中最优极化电位与防腐性能的关系。扫描电镜观察和电化学腐蚀试验证实，与简单浸泡法沉积的镀层相比，恒电位法沉积的镀层在均匀性和耐腐蚀性方面有显著改善。(C) 2007 Elsevier Ltd.版权所有。
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.