Cathodic self-healing at cut-edges: The effect of Zn2+ and Mg2+ ions

被引：54

作者：

Krieg, Romina ^{[1
]}

Rohwerder, Michael ^{[1
]}

Evers, Stefan ^{[1
]}

Schuhmacher, Bernd ^{[2
]}

Schauer-Pass, Janine ^{[2
]}

机构：

[1] Max Planck Inst Eisenforsch GmbH, Dusseldorf, Germany

[2] Thyssen Krupp Steel Europe, Res & Dev, Hannover, Germany

来源：

CORROSION SCIENCE | 2012年 / 65卷

关键词：

cathodic protection; zinc; magnesium; oxygen reduction; passive films; ZINC-MAGNESIUM; CORROSION-RESISTANCE; GALVANIC CORROSION; ZN/STEEL COUPLE; COATED STEEL; DELAMINATION; MECHANISM; ALLOYS; OXYGEN; LAYERS;

D O I：

10.1016/j.corsci.2012.08.008

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

At the cut edge of galvanised steel sheet a small area of exposed zinc has to protect a comparatively large steel area. This should lead to a short system lifetime, if the oxygen reduction on the steel were not quickly inhibited. This "cathodic self-healing" is widely assumed to be due to the formation of zinc corrosion product precipitates. It will be shown that, at least in the early stages of corrosion, this is rather due to a direct modification of the iron oxide by zinc cations, enhanced by magnesium cations, causing an inhibition of oxygen reduction directly on the steel. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：119 / 127

页数：9

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