The Effect of Extrusion Ratio on the Discharge and Corrosion Behavior of Mg-3Al-2.8Y-0.7Mn Alloy

In this study, the impact of extrusion ratio (ER: 10, 16, and 25) on the electrochemical behaviors and discharge performances of Mg-3Al-2.8Y-0.7Mn (wt.%) alloys was investigated. The results indicate that an increase in extrusion ratio contributes to the homogeneous distribution of second phases and improves corrosion resistance. Notably, a higher extrusion ratio (ER25) enables the alloy anode to have the highest proportion of prismatic-oriented grains, leading to improved discharge activity and enhanced shedding of discharge products. Consequently, this alloy exhibits the highest and most stable voltage. At a current density of 20 mA cm⁻², the ER25 anode demonstrates a cell voltage of 1.32 V, discharge capacity of 1170.37 mAh g⁻¹, and anode efficiency of 53.60%. These findings underscore the influence of the extrusion ratio on microstructural features and electrochemical performance, highlighting the potential for optimizing magnesium-air battery anodes through controlled processing methods.