Poisoning the corrosion of magnesium

Despite possessing excellent specific properties, rapid corrosion of magnesium is a significant barrier in its widespread use. Alloying Mg to enhance mechanical properties nominally increases susceptibility to corrosion from microstructural heterogeneity. Furthermore, alloying Mg nominally accelerat...

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Bibliographic Details
Published in:Electrochemistry communications 2013-09, Vol.34, p.295-298
Main Authors: Birbilis, N., Williams, G., Gusieva, K., Samaniego, A., Gibson, M.A., McMurray, H.N.
Format: Article
Language:English
Subjects:
Applied sciences
Arsenic
Cathodic poison
Corrosion
Corrosion mechanisms
Corrosion prevention
Exact sciences and technology
Magnesium
Metals. Metallurgy
Polarisation
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Summary:Despite possessing excellent specific properties, rapid corrosion of magnesium is a significant barrier in its widespread use. Alloying Mg to enhance mechanical properties nominally increases susceptibility to corrosion from microstructural heterogeneity. Furthermore, alloying Mg nominally accelerates cathodic kinetics and hence also accelerates corrosion. To date, no alloying additions to Mg suggest that a reduction in corrosion rate can be imparted, however we reveal for the first time that alloying additions of arsenic can impart significant corrosion resistance to Mg via retarding the cathodic reaction. •Low level As additions lead to ~10 times less hydrogen evolved during corrosion•Significant reduction in the cathodic kinetics of Mg is revealed.•Demonstration of the prospect for more “stainless” Mg.
ISSN:1388-2481
1873-1902
DOI:10.1016/j.elecom.2013.07.021