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Issue 2, 2021
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Approaching “stainless magnesium” by Ca micro-alloying

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Abstract

Severe corrosion of Mg and Mg alloys is a major issue hindering their wider application in transportation industry, medical implants and aqueous batteries. Previously, no Mg-based material has been found with a significantly lower corrosion rate than that of ultra-high-purity Mg, i.e. 0.25 mm y−1 in concentrated NaCl solution. In this work for the first time, highly corrosion-resistant Mg is found to be accomplishable by Ca micro-alloying, bringing “stainless Mg” closer. The designed Mg–Ca lean alloys possess incredibly low corrosion rates, less than 0.1 mm y−1 in 3.5 wt% NaCl solution, which are significantly lower than that of ultra-high-purity Mg and all Mg alloys reported thus far. The outstanding corrosion resistance is attributed to inhibition of cathodic water reduction kinetics, impurities stabilizing and a protective surface film induced by Ca micro-alloying. Combined with the environmental benignity and economic viability, Ca micro-alloying renders huge feasibility on developing advanced Mg-based materials for diverse applications.

Graphical abstract: Approaching “stainless magnesium” by Ca micro-alloying

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Submitted
25 Aug 2020
Accepted
23 Nov 2020
First published
24 Nov 2020

Mater. Horiz., 2021,8, 589-596
Article type
Communication

Approaching “stainless magnesium” by Ca micro-alloying

M. Deng, L. Wang, D. Höche, S. V. Lamaka, C. Wang, D. Snihirova, Y. Jin, Y. Zhang and M. L. Zheludkevich, Mater. Horiz., 2021, 8, 589
DOI: 10.1039/D0MH01380C

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