Electrochemical Behavior of AZ31 Alloy as Anode Material for Magnesium Battery

The magnesium electrode material is greatly concerned in magnesium battery, but there are some problems such as the high self-corrosion rate, low current efficiency and potential lag at the beginning of sequel discharge. So the electrochemical behavior and corrosion behavior of AZ31 magnesium alloy and pure magnesium in MgSO4, Mg(ClO4)2, MgCl2 and Mg(NO3)2 solutions were investigated by means of immersion testing at constant temperature and measurements of polarization curve and constant-current discharge. The results show that the corrosion rate of AZ31 alloy in MgCl2 solution was the highest, and pitting corrosion took place in MgSO4 solution. However in Mg(ClO4)2 and Mg(NO3) the corrosion and discharge efficiency were relatively good.