Journal
CORROSION SCIENCE
Volume 52, Issue 3, Pages 892-900Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2009.11.009
Keywords
Magnesium; Electrochemical calculation; SEM; Oxide coatings
Funding
- National Natural Science Foundation of China [50601007]
- Key Laboratory of Superlight Material and Surface Technology (Harbin Engineering University), Ministry of Education
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The formation process of stannate conversion coating (CC) on AZ91D alloy was in-situ investigated by electrochemical noise (EN). The wavelet transform, as well as noise resistance (R-n) and spectral noise resistance (R-sn), had been employed to analyze the EN data. It was revealed that there exist two distinguishing stages of stannate CC formation process on AZ91D alloy, including an incubation stage companying with the nucleation and nuclei dissolution process, a periodical growth stage involving hemispherical particles growth and coating dissolution process. Furthermore, the results demonstrated that EN was a powerful tool to investigate rapid electrochemical process, such as CC formation process. (C) 2009 Elsevier Ltd. All rights reserved.
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