Approaching "stainless magnesium" by Ca micro-alloying. Issue 2 (27th November 2020)

• Record Type: Journal Article
• Authors: Deng, Min; Wang, Linqian; Höche, Daniel; Lamaka, Sviatlana V.; Wang, Cheng; Snihirova, Darya; Jin, Yiming; Zhang, Yuhui; Zheludkevich, Mikhail L.
• Is Part Of: Materials horizons. Volume 8:Issue 2(2021)
• Page Start: 589
• Page End: 596
• Publication Date: 2020-11-27
• Subjects: Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0mh01380c
• Languages: English
• ISSNs: 2051-6347

Abstract

Abstract : 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. 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.