Abstract The corrosion behavior and discharge performance of a die-cast (DC) Mg-9Al-1Zn (AZ91D) alloy in 3.5 wt% NaCl solution were investigated by means of immersion and electrochemical measurements in comparison with a hot-rolled (HR) AZ91D. The results indicated that the DC AZ91D had a low corrosion rate (0.10 ± 0.01 mm y−1), and superior discharge performance as an anode assembled in Mg-air batteries, especially at low discharge current densities. The anodic efficiency of the DC AZ91D reached 53.47% and 57.72% at 1 and 2.5 mA cm−2, respectively, which were significantly higher than that of many other Mg-based anodes. This efficiency enhancement could mainly be attributed to the uniform microstructure of the DC AZ91D with a continuous β phase network and fine matrix grains, which could produce a more protective corrosion product film. Such a uniform microstructure together with a protective product film can suppress self-corrosion and hinder the detachment of the undermined metallic pieces or the second phase particles from the substrate. Therefore, the DC AZ91D might be developed into an appropriate low cost and highly corrosion-resistant anode with superior discharge performance for Mg-air battery.

中文翻译：

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具有优异放电性能的镁空气电池耐腐蚀压铸Mg-9Al-1Zn负极

摘要 与热轧 (HR) AZ91D 合金相比，通过浸泡和电化学测量，研究了压铸 (DC) Mg-9Al-1Zn (AZ91D) 合金在 3.5 wt% NaCl 溶液中的腐蚀行为和放电性能。 . 结果表明，DC AZ91D 具有低腐蚀速率（0.10 ± 0.01 mm y-1），并且作为组装在镁空气电池中的负极具有优异的放电性能，尤其是在低放电电流密度下。DC AZ91D 的阳极效率在 1 和 2.5 mA cm-2 时分别达到 53.47% 和 57.72%，明显高于许多其他镁基阳极。这种效率的提高主要归因于 DC AZ91D 具有连续 β 相网络和细小的基体晶粒的均匀微观结构，可以产生更具保护性的腐蚀产物膜。这种均匀的微观结构与保护性产品膜一起可以抑制自腐蚀并阻止被破坏的金属片或第二相颗粒从基材上脱离。因此，DC AZ91D 可能会发展成为一种合适的低成本、高耐腐蚀、具有优异放电性能的镁空气电池负极。