Passivation and potential fluctuation of Mg alloy AZ31B in alkaline environments

被引：43

作者：

Li, Shengxi ^{[1
]}

Bacco, Ana C. ^{[2
]}

Birbilis, Nick ^{[3
]}

Cong, Hongbo ^{[2
]}

机构：

[1] Univ Akron, Natl Ctr Educ & Res Corros & Mat Performance NCER, Akron, OH 44325 USA

[2] Univ Akron, Dept Chem & Biomol Engn, Akron, OH 44325 USA

[3] Monash Univ, Dept Mat Sci & Engn, Clayton, Vic, Australia

来源：

CORROSION SCIENCE | 2016年 / 112卷

关键词：

Magnesium; Polarization; Alkaline corrosion; Oxygen reduction; Pitting corrosion; Passive films; AZ91D MAGNESIUM ALLOY; CAST AM50 ALLOY; M KOH SOLUTION; CORROSION BEHAVIOR; ELECTROCHEMICAL-BEHAVIOR; SURFACE-FILM; INTERMETALLIC PHASES; ANODIC-OXIDATION; CHLORIDE-ION; AL ALLOYS;

D O I：

10.1016/j.corsci.2016.08.022

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The passivation and corrosion behaviors of Mg alloy AZ31B were investigated in chloride-free NaOH solutions with pH range from 10 to 14. The results indicate that various phases behave differently at different pH levels. Al-Mn intermetallics serve as strong cathode at pH <= 11, but dissolve at pH >= 13. Ambient oxygen is responsible for the potential rise at pH >= 13 and subsequent significant potential oscillation (>1 V) is attributed to the passive film breakdown at the intergranular boundaries in the oxide film. Optimal passivation is achieved at pH 12 with thin uniform passive film formed across the surface. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：596 / 610

页数：15

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