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Quantifying the Role of Transition Metal Electrodeposition in the Cathodic Activation of Corroding Magnesium / E. Michailidou; Hamilton McMurray; Geraint Williams

Journal of The Electrochemical Society, Volume: 165, Issue: 5, Pages: C195 - C205

Swansea University Authors: Hamilton, McMurray, Geraint, Williams

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DOI (Published version): 10.1149/2.0251805jes

Abstract

High purity (80 ppm iron) magnesium immersed in aqueous sodium chloride solution exhibits a filiform pattern of localized corrosion in which hydrogen is evolved at local (filament head) and remote (filament tail and uncorroded surface) cathode sites. Transition metal cations in solution are shown to...

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Published in: Journal of The Electrochemical Society
ISSN: 0013-4651 1945-7111
Published: 2018
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa39012
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Abstract: High purity (80 ppm iron) magnesium immersed in aqueous sodium chloride solution exhibits a filiform pattern of localized corrosion in which hydrogen is evolved at local (filament head) and remote (filament tail and uncorroded surface) cathode sites. Transition metal cations in solution are shown to significantly accelerate rates of corrosion, principally by activating (catalyzing) the remote cathode sites. The degree of activation is cation concentration dependent and efficiency increases in the order Mn2+ < Fe2+ < Zn2+ < Cu2+. It is proposed that activation occurs as a result of transition metal electrodeposition through a displacement reaction. It is also shown that precipitation of insoluble transition metal (hydr)oxides through time-dependent cation hydrolysis competes with, and reduces the efficiency of, electrodeposition-induced cathodic activation.
College: College of Engineering
Issue: 5
Start Page: C195
End Page: C205