期刊
CORROSION SCIENCE
卷 51, 期 8, 页码 1789-1794出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2009.05.005
关键词
Alloy; Magnesium; EIS
The electrochemical behaviour of an AZ91 magnesium alloy was investigated in a low aggressive medium by means of local and global electrochemical impedance measurements. The results were compared to those obtained on a pure magnesium sample. It was possible to show the individual contribution of each phase constituting the alloy, and it was observed that the corrosion mechanism of the two phases was the same, controlled by the Mg dissolution. However, local impedance diagrams clearly indicated that the kinetics dissolution of the beta-phase was slower than that of the alpha-phase, which was in good agreement with SEM observations. (C) 2009 Elsevier Ltd. All rights reserved.
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