Corrosion and discharge behavior of Mg-xLa alloys (x=0.0-0.8) as anode materials
(1. State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. Chongqing Academy of Science and Technology, Chongqing 401123, China;
3. School of Mechanical and Mining Engineering, The University of Queensland, Brisbane Qld, 4072, Australia)
2. Chongqing Academy of Science and Technology, Chongqing 401123, China;
3. School of Mechanical and Mining Engineering, The University of Queensland, Brisbane Qld, 4072, Australia)
Abstract: The corrosion and discharge performances of binary Mg-xLa (x=0.2-0.8, wt.%) alloys as anode materials for Mg-based batteries were evaluated. Microstructure, hydrogen evolution, mass loss, electrochemical behavior, and half-cell discharge capabilities were characterized. The results show that the corrosion rate of the Mg matrix was decreased by alloying with La, and this could be attributed to the formation of a protective La2O3-containing film on the surface of the alloy. The Mg-0.2La alloy displayed the lowest corrosion rate, i.e., 2.4 mm/a in a 3.5 wt.% NaCl solution, Furthermore, the discharge performance of Mg-0.4La alloy was superior to that of pure Mg and other Mg-La alloys; this could be associated with the modified microstructure of the Mg-0.4La alloy, which decreased the self-corrosion and accelerated the detachment of the discharge products.
Key words: Mg-based batteries; Mg-La alloys; corrosion rate; discharge performance