Electrochemical noise analysis of the corrosion of high-purity Mg-Al alloys

被引：23
作者：
Casajus, Paula [1 ]
Winzer, Nicholas [1 ]
机构：
[1] Fraunhofer Inst Mech Mat IWM, D-79108 Freiburg, Germany
来源：
CORROSION SCIENCE | 2015年 / 94卷
关键词：
Magnesium; Alloy; Pitting corrosion; Passive films; AZ91D MAGNESIUM ALLOY; ATMOSPHERIC CORROSION; LOCALIZED CORROSION; BETA-PHASE; BEHAVIOR; MICROSTRUCTURE; RESISTANCE; AM50; AZ31; ND;
D O I：
10.1016/j.corsci.2015.02.014
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Corrosion of high-purity Mg-Al alloys containing 3, 6 and 9 wt.% Al was investigated using electrochemical noise (EN) analysis. Changes in the EN signals were correlated with macroscopically observable events on the sample surfaces, which were recorded using time-lapse photography. Steady-state corrosion in all alloys was highly localised. For the Mg3%Al alloy, localised corrosion was preceeded by a period of general corrosion. The corrosion rate of the as-cast Mg9%Al alloy was less than those of the other materials but increased with solution annealing time. The results are consistent with strong galvanic coupling between Al-depleted and -enriched zones of the a-phase. (C) 2015 Elsevier Ltd. All rights reserved.
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收藏
页码：316 / 326
页数：11
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