期刊
SURFACE & COATINGS TECHNOLOGY
卷 206, 期 22, 页码 4692-4703出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2012.05.091
关键词
Magnesium; Plasma electrolytic oxidation; Corrosion; Polymer coating; Impact; ac/dc/ac
资金
- MCYT (Spain) [MAT 2009-09845-C02-01]
- MICINN (Spain) via the Ramon y Cajal Programme [RYC-2008-02038, RYC-2010-06749]
Mechanical and corrosion tests were performed on a polymer-coated AZ31 magnesium alloy pre-treated by plasma electrolytic oxidation (PEO). Results were compared with a fluorotitanate-zirconate conversion coating pre-treatment. Mechanical performance was assessed by standardized adhesion (ISO 2409:2007), impact (ISO 6272-1:2004) and impact + adhesion (ISO 6272/ASTMD2794) pass/fail tests. Corrosion behavior was monitored using electrochemical impedance spectroscopy (EIS), ac/dc/ac measurements and continuous exposure to salt fog per ASTM B117 and cyclic exposure per VDA 621-415 (VDA). The PEO + polymer coating revealed lower impact resistance but better corrosion resistance than the Ti/Zr + polymer coating. The ac/dc/ac procedure demonstrated to be faster than EIS measurements for evaluation of the corrosion performance of studied coatings. (c) 2012 Elsevier B.V. All rights reserved.
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