Evolution of hydrogen at dissolving magnesium surfaces

被引：353

作者：

Frankel, G. S. ^{[1
,2
]}

Samaniego, A. ^{[2
,3
]}

Birbilis, N. ^{[2
]}

机构：

[1] Ohio State Univ, Fontana Corros Ctr, Columbus, OH 43210 USA

[2] Monash Univ, Dept Mat Engn, Clayton, Vic 3168, Australia

[3] CENIM, Dept Mat Engn Corros & Durabil, Madrid, Spain

来源：

CORROSION SCIENCE | 2013年 / 70卷

基金：

澳大利亚研究理事会;

关键词：

Magnesium; Galvanostatic; Anodic dissolution; CORROSION BEHAVIOR; ANODIC-DISSOLUTION; 3.5-PERCENT NACL; PURE MAGNESIUM; ALLOY; DIFFERENCE; CHLORIDE; MG; AZ91;

D O I：

10.1016/j.corsci.2013.01.017

中图分类号：

T [工业技术];

学科分类号：

120111 [工业工程];

摘要：

The origin of hydrogen evolved at dissolving magnesium surfaces, including those subjected to anodic polarisation, remains a topical issue. In this work, a critical appraisal of existing theories is presented, along with data from simultaneous polarisation and hydrogen collection tests. The observations invalidate mechanisms invoking the presence of univalent Mg+. A combined experimental and thermodynamic analysis suggests that the ability of magnesium to support the cathodic reaction is enhanced during dissolution as the result of an increase in the exchange current density for the hydrogen evolution reaction, This mechanism can also explain high rates of hydrogen evolution in aluminium pits. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：104 / 111

页数：8

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