Corrosion behaviour of magnesium/aluminium alloys in 3.5 wt.% NaCl

被引：537
|
作者：
Pardo, A. [1 ]
Merino, M. C. [1 ]
Coy, A. E. [1 ]
Arrabal, R. [2 ]
Viejo, F. [2 ]
Matykina, E. [2 ]
机构：
[1] Univ Complutense Madrid, Fac Quim, Dept Ciencia Mat, E-28040 Madrid, Spain
[2] Univ Manchester, Sch Mat, Ctr Corros & Protect, Manchester M60 1QD, Lancs, England
来源：
CORROSION SCIENCE | 2008年 / 50卷 / 03期
关键词：
magnesium; polarization; weight loss; corrosion;
D O I：
10.1016/j.corsci.2007.11.005
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Corrosion behaviour of commercial magnesium/aluminium alloys (AZ31, AZ80 and AZ91D) was investigated by electrochemical and gravimetric tests in 3.5 wt.% NaCl at 25 degrees C. Corrosion products were analysed by scanning electron microscopy, energy dispersive X-ray analysis and low-angle X-ray diffraction. Corrosion damage was mainly caused by formation of a Mg(OH)(2) corrosion layer. AZ80 and AZ91D alloys revealed the highest corrosion resistance. The relatively fine beta-phase (Mg17Al12) network and the aluminium enrichment produced on the corroded surface were the key factors limiting progression of the corrosion attack. Preferential attack was located at the matrix/beta-phase and matrix/MnAl intermetallic compounds interfaces. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：823 / 834
页数：12
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