Effect of crystallographic orientation on the discharge and corrosion behaviour of AP65 magnesium alloy anodes

• Published in: Corrosion science 2018-11, Vol.144, p.107-126
• Main Authors: Wang, Naiguang, Mu, Yangchang, Xiong, Wenhui, Zhang, Junchang, Li, Qi, Shi, Zhicong
• Format: Article
• Language: English
• Subjects: A. Magnesium; Alloys; Anodes; B. Galvanostatic; B. Polarization; B. SEM; Batteries; C. Anodic dissolution; Corrosion; Corrosion effects; Corrosion rate; Crystallography; Discharge; Effects; Electrochemical analysis; Magnesium; Magnesium base alloys; Orientation effects; Planes; Seawater
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2018.08.003

•The (0001) basal planes have lower corrosion rates at open circuit potentials.•The (0001) basal planes inhibit the self-discharge of AP65 at 180 mA cm−2.•The (1120) and (1010) prismatic planes exhibit stronger activity during discharge.•The (1120) and (1010) prismatic planes improve the anodic efficiency at 10 mA cm−2. AP65 doped with different elements are rolled into the anode plates for Mg-air battery and higher-power seawater activated battery. The discharge and corrosion behaviour of their cross- section surfaces (CS) and rolling surfaces (RS) is systematically studied and the results show that the RS consisting of (0001) crystallographic planes have lower corrosion rates and inhibit the self- discharge at 180 mA cm−2, whereas the CS with (112¯0) and (101¯0) planes provide higher anodic efficiencies at 10 mA cm−2 and possess stronger discharge activity. Furthermore, the dissolution mechanisms of different surfaces are also elucidated based on microstructure characterization and electrochemical response.