Title: Effects of Hot-rolling on Microstructure and Electrochemical Discharge Behavior of Mg-6Al Alloy as Anode for Mg-air Battery

Biography:

Abstract

As-cast and hot rolled Mg-6Al samples were electrochemically tested as anodes of a Mg-air battery in a 3.5 wt.% NaCl electrolyte and further examined using XRD and SEM. Results obtained indicate that hot rolled sample shows a more stable discharge voltage, a higher anode utilization rate, a higher specific discharge capacity and a more uniform corrosion than as-cast sample. Corrosion mechanism is found to be dependant on microstructure: second phase (Al₁₇Mg₁₂) corrosion for as-cast sample and grain boundary corrosion for hot rolled sample. In addition, corrosion products are easier to peel off the surface of hot rolled sample. Based on results shown in this paper, it can be concluded that hot rolled Mg-6Al is more suitable as anode for the Mg-air battery.