Corrosion behaviour of Mg/Al alloys with composite coatings

被引：45

作者：

Pardo, A. ^{[1
]}

Merino, M. C. ^{[1
]}

Mohedano, M. ^{[1
]}

Casajus, P. ^{[1
]}

Coy, A. E. ^{[2
]}

Arrabal, R. ^{[1
]}

机构：

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

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

来源：

SURFACE & COATINGS TECHNOLOGY | 2009年 / 203卷 / 09期

关键词：

Magnesium alloys; Al/SiC coatings; Corrosion; Composites; Thermal spraying; THERMAL SPRAY COATINGS; AL-SICP COMPOSITES; WEAR BEHAVIOR; ALUMINUM; MICROSTRUCTURE;

D O I：

10.1016/j.surfcoat.2008.10.030

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The corrosion behaviour of aluminium/silicon carbide (Al/SiC) composite coatings deposited by thermal spray on AZ31, AZ80 and AZ91D magnesium-aluminium alloys was investigated by electrochemical and gravimetric measurements in 3.5 wt.% NaCl solution at 22 degrees C. Corrosion products were examined by scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis and low-angle X-ray diffraction (XRD). Al/SiC composite coatings in the as-sprayed state revealed high level of porosity with poor bonding at the Al/SiC and coating/substrate interfaces, which facilitated degradation of the magnesium substrates by a mechanism of galvanic corrosion. Cold-pressing post-treatment produced more compact coatings with improved corrosion performance in 3.5 wt.% NaCl compared with as-sprayed coatings. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：1252 / 1263

页数：12

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