Effects of hot-rolling on microstructure and electrochemical discharge behavior of Mg-6Al alloy as anode for Mg-air battery

---

Guangxin Wang, Yongfa Song, Jingling Ma and Yaqiong Li

Henan University of Science and Technology, China

: J Chem Appl Chem Eng

Abstract

---

As-cast and hot rolled Mg-6Al samples were electrochemically tested as anodes of an 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, higher specific discharge capacity and more uniform corrosion than as-cast sample. Corrosion mechanism is found to be dependent on microstructure: second phase (Al17Mg12) corrosion for as-cast sample and grain boundary corrosion for the hot-rolled sample. In addition, corrosion products are easier to peel off the surface of the hot rolled sample. Based on results shown in this paper, it can be concluded that hot rolled Mg-6Al is more suitable as an anode for the Mg-air battery.

Biography

---

Guangxin Wang has received his PhD in Materials Science from University of Bremen, Germany in 1990. Currently, he is the director of Reserch Center for High Purity Materials, Henan University of Science and Technology, China. His research fields cover high purity materials, metal-air batteries, nano particles, thin films and coatings etc. He has published over 80 papers in reputed journasls.

E-mail: wgx58@126.com