Revealing the impact of microstructure on corrosion and discharge behaviors of Mg-1Er alloy anodes for Mg-air batteries

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-10-02 DOI:10.1016/j.corsci.2025.113378

Yuantai He , Liang Wu , Yuan Yuan , Guozhi Wu , Yanlong Ma , Jinxing Wang , Jingfeng Wang , Viswanathan S. Saji , Fusheng Pan

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Abstract

Developing magnesium (Mg) alloy anodes with high discharge activity and controlled self-corrosion has high significance for Mg-air batteries. Microstructural optimization of the alloy anode is a straightforward strategy to enhance the discharge performance. In this study, we investigated the corrosion and discharge behaviors of extruded Mg-1Er (wt%) alloy anodes with varying microstructural features. Our results indicate that the Mg-1Er alloy with (10−10) and (11−20) orientated grains exhibits higher surface electrochemical activity than (0001) orientated grains, which are more prone to corrosion, whereas they exhibit better performance. The small grain size implies a large number of grain boundaries distributed on the surface, which can improve the surface electrochemical activity, but also reduce the corrosion resistance. Mg-1Er (TS) alloy machining along the vertical extrusion direction exhibits superior discharge performance with a discharge voltage of 1.333 V and an anodic efficiency of 51.9 % at 10 mA/cm². This is attributed to the high surface electrochemical activity and the facile shedding of discharge products.

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揭示微观组织对镁空气电池用Mg-1Er合金阳极腐蚀和放电行为的影响

开发具有高放电活性和可控自腐蚀的镁合金阳极对镁空气电池具有重要意义。合金阳极的微观结构优化是提高放电性能的直接策略。在本研究中，我们研究了挤压Mg-1Er （wt%）合金阳极不同组织特征的腐蚀和放电行为。结果表明，（10−10）和（11−20）取向晶粒的Mg-1Er合金比（0001）取向晶粒具有更高的表面电化学活性，更容易腐蚀，而（0001）取向晶粒具有更好的性能。晶粒尺寸小意味着表面分布着大量的晶界，这可以提高表面的电化学活性，但也降低了耐腐蚀性。Mg-1Er （TS）合金沿垂直挤压方向加工表现出优异的放电性能，放电电压为1.333 V， 10 mA/cm2时阳极效率为51.9% %。这是由于高表面电化学活性和易脱落的放电产物。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.