Approaching "stainless magnesium" by Ca micro-alloying

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 i...

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Published inMaterials horizons Vol. 8; no. 2; pp. 589 - 596
Main Authors Deng, Min, Wang, Linqian, Höche, Daniel, Lamaka, Sviatlana V, Wang, Cheng, Snihirova, Darya, Jin, Yiming, Zhang, Yuhui, Zheludkevich, Mikhail L
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 01.02.2021
Subjects
Alloying
Alloys
Calcium
Cathodic protection
Corrosion
Corrosion rate
Corrosion resistance
Corrosion resistant alloys
Magnesium
Magnesium base alloys
Materials Testing
Microalloying
Prostheses and Implants
Purity
Sodium chloride
Surgical implants
Transportation applications
Transportation industry
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Summary: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. Highly corrosion-resistant Mg is readily achievable by Ca micro-alloying, making "stainless Mg" possible. The designed lean Mg-Ca holds great promise in diverse applications, particularly biodegradable medical implants and aqueous batteries.
Bibliography:10.1039/d0mh01380c
Electronic supplementary information (ESI) available. See DOI
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ISSN:2051-6347
2051-6355
DOI:10.1039/d0mh01380c