Formation and breakdown of surface films on magnesium and its alloys in aqueous solutions

Nobuyoshi Hara; Yasuhiro Kobayashi; Daisuke Kagaya; Noboru Akao

doi:10.1016/j.corsci.2006.05.033

Formation and breakdown of surface films on magnesium and its alloys in aqueous solutions

Nobuyoshi Hara, Yasuhiro Kobayashi, Daisuke Kagaya, Noboru Akao

Research output: Contribution to journal › Article › peer-review

180 Citations (Scopus)

Abstract

The influences of surface films formed by open-circuit exposure to neutral solutions on the corrosion and electrochemical behaviour of pure Mg and Mg alloys have been examined by in situ ellipsometric analysis and electrochemical measurements. Surface films mainly composed of Mg(OH)₂ grew rapidly during open-circuit exposure to 0.1 M NaCl and 0.1 M Na₂SO₄ solutions. These films had protective ability to passivate Mg in the solutions. However, they suffered local breakdown under anodic polarisation. The passive current density decreased and the breakdown potential increased with increasing immersion time and film thickness. Influences of purity and alloying elements on the passivity and its breakdown of Mg have been discussed.

Original language	English
Pages (from-to)	166-175
Number of pages	10
Journal	Corrosion Science
Volume	49
Issue number	1
DOIs	https://doi.org/10.1016/j.corsci.2006.05.033
Publication status	Published - 2007 Jan

Keywords

A. Magnesium
A. Mg alloys
B. Ellipsometry
C. Film thickness
C. Oxidation films

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Materials Science(all)

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10.1016/j.corsci.2006.05.033

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abstract = "The influences of surface films formed by open-circuit exposure to neutral solutions on the corrosion and electrochemical behaviour of pure Mg and Mg alloys have been examined by in situ ellipsometric analysis and electrochemical measurements. Surface films mainly composed of Mg(OH)2 grew rapidly during open-circuit exposure to 0.1 M NaCl and 0.1 M Na2SO4 solutions. These films had protective ability to passivate Mg in the solutions. However, they suffered local breakdown under anodic polarisation. The passive current density decreased and the breakdown potential increased with increasing immersion time and film thickness. Influences of purity and alloying elements on the passivity and its breakdown of Mg have been discussed.",

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T1 - Formation and breakdown of surface films on magnesium and its alloys in aqueous solutions

AU - Hara, Nobuyoshi

AU - Kobayashi, Yasuhiro

AU - Kagaya, Daisuke

AU - Akao, Noboru

PY - 2007/1

Y1 - 2007/1

N2 - The influences of surface films formed by open-circuit exposure to neutral solutions on the corrosion and electrochemical behaviour of pure Mg and Mg alloys have been examined by in situ ellipsometric analysis and electrochemical measurements. Surface films mainly composed of Mg(OH)2 grew rapidly during open-circuit exposure to 0.1 M NaCl and 0.1 M Na2SO4 solutions. These films had protective ability to passivate Mg in the solutions. However, they suffered local breakdown under anodic polarisation. The passive current density decreased and the breakdown potential increased with increasing immersion time and film thickness. Influences of purity and alloying elements on the passivity and its breakdown of Mg have been discussed.

AB - The influences of surface films formed by open-circuit exposure to neutral solutions on the corrosion and electrochemical behaviour of pure Mg and Mg alloys have been examined by in situ ellipsometric analysis and electrochemical measurements. Surface films mainly composed of Mg(OH)2 grew rapidly during open-circuit exposure to 0.1 M NaCl and 0.1 M Na2SO4 solutions. These films had protective ability to passivate Mg in the solutions. However, they suffered local breakdown under anodic polarisation. The passive current density decreased and the breakdown potential increased with increasing immersion time and film thickness. Influences of purity and alloying elements on the passivity and its breakdown of Mg have been discussed.

KW - A. Magnesium

KW - A. Mg alloys

KW - B. Ellipsometry

KW - C. Film thickness

KW - C. Oxidation films

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Formation and breakdown of surface films on magnesium and its alloys in aqueous solutions

Abstract

Keywords

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