Anodic Dissolution Behavior in the Electrorefining of Al–Cu Alloys Using an EmImCl–AlCl₃ Ionic Liquid

To produce high-purity Al from Al–Cu alloys, the dissolution behaviors of various binary alloy anodes in EmImCl–AlCl 3 ionic liquid have been investigated at 323 K. In anodic polarization measurements, current density peaks were observed potentials approximately 0.3 and 0.8 V vs Al/Al(III) for Al–5.0%Cu casting alloy. constant potential electrolysis cold-rolled plate V, atoms matrix phase preferentially dissolved followed by formation 2 Cu surface species. The both occurred during 1.2 V. Moreover, a Cu-rich layer derived was formed on Additionally, co-deposited cathode which dissolved. dependence behavior Al−Cu alloys analyzed. By controlling potential, into electrolyte can be suppressed, thus considerably increasing purity electrorefined Al.