Evaluation of self-healing ability of Ce-V conversion coating on AZ31 magnesium alloy

被引：59
作者：
Jiang, Xiao [1 ]
Guo, Ruiguang [1 ]
Jiang, Shuqin [1 ]
机构：
[1] Xian Univ Architecture & Technol, Minist Educ, Key Lab Northwest Water Resources Environm & Ecol, Xian 710055, Peoples R China
来源：
JOURNAL OF MAGNESIUM AND ALLOYS | 2016年 / 4卷 / 03期
基金：
中国国家自然科学基金;
关键词：
AZ31 magnesium alloy; Vanadium; Cerium; Self-healing; Electrochemical impedance spectroscopy; ACTIVE CORROSION PROTECTION; ALUMINUM-ALLOY; MIXED-OXIDE; CHROMATE; AA2024; CERIUM; DISSOLUTION; INHIBITION; RESISTANCE; EFFICIENCY;
D O I：
10.1016/j.jma.2016.06.003
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
This study investigated the influence of cerium nitrate in vanadate solutions on the properties of Ce-V conversion coatings on AZ31 magnesium alloys, and evaluated the self-healing behavior of the Ce-V conversion coating for AZ31 magnesium alloy. The results showed that the additions of cerium nitrate prevented pentavalent vanadium from reducing to tetravalent vanadium in the coatings during conversion reaction process. Adding appropriate cerium nitrate to vanadate solution led to a thicker coating with a more compact CeVO4 layer. The corrosion behavior of the Ce-V conversion coating was investigated by the electrochemical tests and the scratch immersion test in 3.5 wt.% NaCl solution. The self-healing ability of the coating was confirmed from all tests. The surface analysis revealed that the self-healing effect of the Ce-V conversion coating was only provided by the release and migration of vanadium compounds. (C) 2016 Production and hosting by Elsevier B.V. on behalf of Chongqing University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
引用
收藏
页码：230 / 241
页数：12
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