What is it about?
This work shows that Mg hydrides are capable of catalyzing the hydrogen evolution reaction both at the corrosion potential and applied anodic potentials. Hydrides are also shown to exist within and at the leading edge of propagating corrosion filaments. This is strong evidence that a Mg hydride intermediate is an important intermediate in the corrosion of Mg and Mg alloys.
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Why is it important?
This work is important because it offers an explanation for the widely observed "filiform-like" corrosion morphology on Mg alloys while accounting for the increase in hydrogen evolution at anodic overpotentials. This work advances the fundamental understanding of Mg and Mg alloy corrosion.
Perspectives
This work is intended to investigate a lesser known corrosion mechanism for Mg and its alloys. While more work is required to pin this mechanism down we feel that we have validated a hydride based mechanism for Mg corrosion.
Wilfred Binns
Nuclear Waste Management Organization
Read the Original
This page is a summary of: Physical and Electrochemical Evidence for the Role of a Mg Hydride Species in Mg Alloy Corrosion, CORROSION, January 2019, NACE International,
DOI: 10.5006/2918.
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