商用MB1和MB8镁合金在NaCl溶液中的电化学性能

Electrochemical Performance of Commercial MB1 and MB8 Mg-alloys in NaCl Solution

研究了挤压态MB1和铸态MB8镁合金在不同浓度NaCl溶液中的腐蚀和电化学性能。结果表明,随着NaCl电解液浓度升高,镁合金的阳极利用效率不断升高,放电电压更高。放电电流密度为10 mA·cm^(-2)时,铸态MB8和挤压态MB1镁合金的阳极利用效率在4 mol/L的NaCl电解液中最高,分别为41.8%和38.8%。得益于更细的晶粒,挤压态MB1合金表现出更高的活性,放电电压比铸态MB8合金略高一些,且放电电压更稳定。铸态MB8合金晶粒相对较粗大,但自腐蚀速率更低、阳极利用效率更高。

Mg-alloys,as light-weight high-performance materials,have extensive potential applications 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 Mgalloys 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 concentration 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-alloys reach 41.8%and 38.8%,respectively.The extruded MB1 alloy,due to its finer grain structure,exhibits higher activity,slightly higher and more stable discharge voltage in comparison with the cast MB8 alloy.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 development of Mg-air batteries and are expected to further advance the application of Mg-alloys in the field of energy storage.