期刊
CORROSION SCIENCE
卷 51, 期 11, 页码 2685-2693出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2009.07.009
关键词
Magnesium; TEM; SEM; EIS; Pitting corrosion
资金
- National Natural Science Foundation of China [50601007]
- Key Laboratory of Superlight Material and Surface Technology (Harbin Engineering University), Ministry of Education
A new stannate conversion coating (CC) on AZ91D alloy was synthesized by the application of alternative voltage (AV) treatment technique. By using AV technique, the formation process of CC can be controlled. SEM results indicated that a continuous and compact dual-layer CC was formed on alloy surface after AV treatment. TEM results revealed that the inner layer consists of magnesium-aluminum-stannum nanocrystals and amorphous, meanwhile, the outer layer is primarily a mixture of magnesium-stannum hydroxides and oxides with amorphous structure. The electrochemical experimental results revealed that AV treatment significantly improved the corrosion resistance of CC, which attributed to the distinguishing microstructure of AV-CC. (C) 2009 Elsevier Ltd. All rights reserved.
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