Assessment of duplex coating combining plasma electrolytic oxidation and polymer layer on AZ31 magnesium alloy

被引：118

作者：

Arrabal, R. ^{[1
]}

Mota, J. M. ^{[2
]}

Criado, A. ^{[1
]}

Pardo, A. ^{[1
]}

Mohedano, M. ^{[1
]}

Matykina, E. ^{[1
]}

机构：

[1] Univ Complutense, Fac Ciencias Quim, Dept Ciencia Mat, E-28040 Madrid, Spain

[2] Desarrollo & Control Tecnol, Alcala De Henares 28806, Spain

来源：

SURFACE & COATINGS TECHNOLOGY | 2012年 / 206卷 / 22期

关键词：

Magnesium; Plasma electrolytic oxidation; Corrosion; Polymer coating; Impact; ac/dc/ac; MG-AL ALLOYS; CORROSION PROTECTION; PEO COATINGS; RESISTANCE; AZ91D; ENVIRONMENTS; CHLORIDE;

D O I：

10.1016/j.surfcoat.2012.05.091

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页码：4692 / 4703

页数：12

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