Abstract
Comprehending the corrosion mechanism of magnesium is of major interest in diverse fields. Typically, hydrogen evolution reaction is considered as the only cathodic reaction during Mg corrosion. However, recent works demonstrate importance of considering oxygen reduction reaction (ORR) as a second cathodic process at specific conditions. With oxygen micro-optode, we show that ORR rate was higher on slower corroding ultra-high-purity Mg (UHP-Mg), while lower on faster corroding commercially pure Mg (CP-Mg), where massive hydroxide layer impeded oxygen permeation. These findings shed light on yet another facet of complex mechanism of Mg corrosion.
Highlights
Magnesium, owing to its low density and high strength-toweight ratio, has become a fascinating technological material attracting enormous academic and industrial interest
Even though compelling evidence supports hydrogen evolution reaction (HER) as the primary cathodic reaction, oxygen reduction reaction (ORR), as a secondary cathodic reaction, has progressively earned its value in the corrosion behavior of Mg and its alloys
It has been reported that ORR might participate in the formation of corrosion products of AZ91D during NaCl induced atmospheric corrosion.[10]
Summary
Magnesium, owing to its low density and high strength-toweight ratio, has become a fascinating technological material attracting enormous academic and industrial interest. Simultaneous measurements of local DO concentration and current density (by SVET) was performed.[13] Strebl et al.[14,15] provided the evidence for the contribution of ORR to cathodic processes on Mg alloy during atmospheric corrosion.
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