Effect of Y element microalloying on the microstructure and properties of Mg-0.5Zn alloy as negative electrode for magnesium air battery
After three kinds of Mg-0.5Zn-xY(x=0.1,0.3 and 0.5)alloys had been pre-pared,the microstructure of the alloys was analyzed by optical microscope and X-ray diffrac-tometer,and the electrochemical properties of the alloys and their performance as negative e-lectrode materials for magnesium air batteries were analyzed through polarization curves,electrochemical impedance spectroscopy and constant current discharge curves.The results show that all the three alloys have single-phase structures,and with the increase of Y con-tent,the grain size is gradually refined,the corrosion potential gradually shifts negatively,the corrosion current densities gradually decrease,and the sum of charge transfer impedance Rt and film impedance Rf gradually increase.It indicates that the addition of trace Y refines the grain structure without introducing the second phase,and improves the electrochemical activity and corrosion resistance.It also increases the discharge voltage and the anode effi-ciency of the magnesium air batteries,and improves Mg-0.5Zn alloy performance as negative electrode materials for magnesium air batteries.
Mg-0.5Zn alloymicroalloyingcorrosion resistanceelectrochemical activi-tymagnesium air battery
万方数据
维普
