摘要
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10mA·cm-2时,铸态MB8和挤压态MB1镁合金的阳极利用效率在4mol/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.
Abstract
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.
基金项目
河南省重点研发与推广专项(232102231019)
NETL
NSTL
万方数据