Corrosion resistance of WE43 and AZ91D magnesium alloys with phosphate PEO coatings

被引：296

作者：

Arrabal, R. ^{[1
]}

Matykina, E. ^{[1
]}

Viejo, F. ^{[1
]}

Skeldon, P. ^{[1
]}

Thompson, G. E. ^{[1
]}

机构：

[1] Univ Manchester, Ctr Corros & Protect, Sch Mat, Manchester M60 1QD, Lancs, England

来源：

CORROSION SCIENCE | 2008年 / 50卷 / 06期

基金：

英国工程与自然科学研究理事会;

关键词：

magnesium; oxide coatings; anodic films; polarization; pitting corrosion;

D O I：

10.1016/j.corsci.2008.03.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The corrosion performance of WE43-T6 and AZ91D magnesium alloys with and without treatment by plasma electrolytic oxidation (PEO) was investigated by electrochemical measurements in 3.5 wt.% NaCl solution. For untreated WE43-T6 alloy, formation of a uniform corrosion la er (Mg(OH)(2)) Was accompay nied by initial pits around magnesium-rare earth intermetallic compounds. The AZ91D alloy disclosed increased corrosion susceptibility, with localized corrosion around the P-phase, though the p-phase network phase acted as a barrier for corrosion progression. PEO treatment in alkaline phosphate electrolyte improved the corrosion resistance of WE43-T6 alloy only at the initial stages of immersion in the test solution. However, PEO-treated AZ91D alloy revealed a relatively high corrosion resistance for much increased immersion times, contrary to the relative corrosion resistances of the untreated alloys. The improved performance of the PEO-treated AZ91D alloy appears to be related to the formation of a more compact coating. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1744 / 1752

页数：9

共 35 条

[1] Evaluation of microstructural effects on corrosion behaviour of AZ91D magnesium alloy [J].

Ambat, R ;

Aung, NN ;

Zhou, W .

CORROSION SCIENCE, 2000, 42 (08) :1433-1455

[2] Studies on the influence of chloride ion and pH on the corrosion and electrochemical behaviour of AZ91D magnesium alloy [J].

Ambat, R ;

Aung, NN ;

Zhou, W .

JOURNAL OF APPLIED ELECTROCHEMISTRY, 2000, 30 (07) :865-874

[3] Volta potential of second phase particles in extruded AZ80 magnesium alloy [J].

Andreatta, F ;

Apachitei, I ;

Kodentsov, AA ;

Dzwonczyk, J ;

Duszczyk, J .

ELECTROCHIMICA ACTA, 2006, 51 (17) :3551-3557

[4] Hardening precipitation in a Mg-4Y-3RE alloy [J].

Antion, C ;

Donnadieu, P ;

Perrard, F ;

Deschamps, A ;

Tassin, C ;

Pisch, A .

ACTA MATERIALIA, 2003, 51 (18) :5335-5348

[5] The relation between microstructure and corrosion behavior of Mg-Y-RE-Zr alloys [J].

Ben-Hamu, G. ;

Eliezer, D. ;

Shin, K. S. ;

Cohen, S. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2007, 431 (1-2) :269-276

[6] Anodizing treatments for magnesium alloys and their effecton corrosion resistance in various environments [J].

Blawert, Carsten ;

Dietzel, Wolfgang ;

Ghali, Edward ;

Song, Guangling .

ADVANCED ENGINEERING MATERIALS, 2006, 8 (06) :511-533

[7] Electrochemical performance of microarc oxidation films formed on AZ91D magnesium alloy in silicate and phosphate electrolytes [J].

Cai, QZ ;

Wang, LS ;

Wei, BK ;

Liu, QX .

SURFACE & COATINGS TECHNOLOGY, 2006, 200 (12-13) :3727-3733

[8]

Dahle A.K., 2001, J. Light Metals, V1, P61, DOI DOI 10.1016/S1471-5317(00)00007-9

[9] Synchrotron X-ray microtomography study of the role of Y in corrosion of magnesium alloy WE43 [J].

Davenport, Alison J. ;

Padovani, Cristiano ;

Connolly, Brian J. ;

Stevens, Nicholas P. C. ;

Beale, Thomas A. W. ;

Groso, Amela ;

Stampanoni, Marco .

ELECTROCHEMICAL AND SOLID STATE LETTERS, 2007, 10 (02) :C5-C8

[10] Effect of electrolyte additives on performance of plasma electrolytic oxidation films formed on magnesium alloy AZ91D [J].

Duan, Hongping ;

Yan, Chuanwei ;

Wang, Fuhui .

ELECTROCHIMICA ACTA, 2007, 52 (11) :3785-3793

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