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Indexed by:期刊论文

Date of Publication:2021-01-10

Journal:MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION

Volume:71

Issue:11

Page Number:1812-1823

ISSN No.:0947-5117

Key Words:aluminum content; discharge potential; Mg-Al alloy anodes; utilization efficiency

Abstract:Al is one of the principal alloying elements for Mg anodes. In this study, a series of Mg-Al alloys has been evaluated as anode materials for optimizing the Al addition amount in Mg anodes with the intention of improving the discharge performance in aqueous batteries. The effect of Al content on the discharge potential and corrosion resistance of the Mg anode has been investigated through microstructure characterization, electrochemical measurements in a half-cell, discharge morphology analysis, and Mg-water battery tests. The results show that the Mg-1Al alloy possesses a larger corrosion resistance during discharge, with significant increase of the anode utilization efficiency at 1 and 5 mA/cm(2)compared with pure Mg. However, a further increase of Al content does not continuously improve the discharge performance of the Mg anode with the decline of utilization efficiency due to the influence of the precipitated phase. This study contributes to a better understanding about the effect of Al on anodic dissolution and corrosion kinetics of the Mg anode.