The negative difference effect of magnesium and of the AZ91 alloy in chloride and stannate-containing solutions

被引：86

作者：

Thomaz, T. R. ^{[1
]}

Weber, C. R. ^{[1
]}

Pelegrini, T., Jr. ^{[1
]}

Dick, L. F. P. ^{[1
]}

Knornschild, G. ^{[1
]}

机构：

[1] Univ Fed Rio Grande do Sul, Dept Met, Porto Alegre, RS, Brazil

来源：

CORROSION SCIENCE | 2010年 / 52卷 / 07期

关键词：

Magnesium; Pitting corrosion; CORROSION-RESISTANCE; ELECTROCHEMICAL CORROSION; LOCALIZED CORROSION; PITTING CORROSION; AQUEOUS-SOLUTION; BEHAVIOR; HYDROGEN; KINETICS;

D O I：

10.1016/j.corsci.2010.03.010

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The negative difference effect of pure magnesium and of the alloy AZ91 was investigated by volumetric tests in NaCI with and without addition of Na(2)SnO(3). Hydrogen comes from two sources: H(2) which accompanies localized magnesium dissolution inside the pits and H(2) from H(2)O reduction at the passive surface outside the pits. By separating the two parts it could be shown that the rate of hydrogen evolution inside the pits is quantitatively consistent with a two-step EC-mechanism of magnesium dissolution with hydrogen evolution coupled to the second dissolution step. Addition of Na(2)SnO(3) does not influence the second step. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：2235 / 2243

页数：9

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