The effect of iron re-deposition on the corrosion of impurity-containing magnesium
authors Hoche, D; Blawert, C; Lamaka, SV; Scharnagl, N; Mendis, C; Zheludkevich, ML
nationality International
journal PHYSICAL CHEMISTRY CHEMICAL PHYSICS
keywords HYDROGEN EVOLUTION REACTION; ENHANCED CATALYTIC-ACTIVITY; PURE MAGNESIUM; ALKALINE-SOLUTION; GALVANOSTATIC DISSOLUTION; ANODIC POLARIZATION; ELECTROCHEMICAL BEHAVIOR; WATER ELECTROLYSIS; VOLMER-HEYROVSKY; MG SURFACES
abstract This article provides a contribution towards the mechanistic understanding of surface phenomena observed during the corrosion of Mg-based substrates particularly in the low anodic polarization range. The concept considers the recent literature explaining cathodic hydrogen evolution from noble acting areas even during global anodic polarization. Heavy metal impurities in the ppm range or intermetallics are always present even in highly pure magnesium. Their potential effect was investigated here in more detail. The experimental results contribute to understanding the role of iron impurities in dark area formation and suggest a way for linking the observed phenomena to the recent literature. The shown enhanced cathodic activity of dark areas especially at the corrosion front and the superfluous hydrogen are linked to an iron re-deposition mechanism due to iron reduction. The proposed mechanism is based on the results obtained from innovative characterisation techniques using magnetic fields, diffraction experiments and transmission electron microscopy, which show the formation of iron rich zones, especially at the corrosion front offering "in statu nascendi'' metallic Fe films acting as active cathodes for hydrogen reduction.
publisher ROYAL SOC CHEMISTRY
issn 1463-9076
year published 2016
volume 18
issue 2
beginning page 1279
ending page 1291
digital object identifier (doi) 10.1039/c5cp05577f
web of science category Chemistry, Physical; Physics, Atomic, Molecular & Chemical
subject category Chemistry; Physics
unique article identifier WOS:000369480600070
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journal analysis (jcr 2019):
journal impact factor 3.43
5 year journal impact factor 3.735
category normalized journal impact factor percentile 69.267
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