Electrochemical Performance of Commercial MB1 and MB8 Mg-alloys in NaCl Solution
Mg-alloys,as light-weight high-performance materials,have extensive potential applica-tions in various fields.However,in practical use for metal-air batteries,their electrochemical performance is significantly influenced by the composition and condition of the anode material.Therefore,to develop more efficient Mg-air batteries,it is crucial to study the electrochemical performance of commercial Mg-alloys in the presence of different electrolytes.This study focuses on the corrosion and electrochemical performance of extruded MB1 and cast MB8 Mg-alloys in NaCl solutions of varying concentrations in terms of the anode utilization efficiency,discharge voltage,and grain structures.The results indicate that the electrochemical performance of Mg-alloys was improved significantly as the NaCl electrolyte concen-tration increases.Specifically,with increasing concentration,the anode utilization efficiency was gradually improved,accompanied by higher discharge voltages.When the discharge current density is 10 mA·cm-2 in 4 mol/L NaCl electrolyte,the peak anode utilization efficiency for cast MB8 and extruded MB1 Mg-al-loys reach 41.8％and 38.8％,respectively.The extruded MB1 alloy,due to its finer grain structure,exhib-its higher activity,slightly higher and more stable discharge voltage in comparison with the cast MB8 al-loy.Besides,the cast MB8 alloy has relatively coarser grains,but it has a lower self-corrosion rate and higher anode utilization efficiency.In sum,the extruded MB1 alloy shows higher activity,while the cast MB8 alloy exhibits superior corrosion resistance.These findings offer useful guidance for the future devel-opment of Mg-air batteries and are expected to further advance the application of Mg-alloys in the field of energy storage.
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