Characteristics of Anodic Dissolution for Al-Cu Alloys in EmImCl-AlCl 3 Ionic Liquid

• Published in: ECS transactions 2022-09, Vol.109 (14), p.55-64
• Main Authors: Nunomura, Junji, Matsushima, Hisayoshi, Kyo, Yoshihiko, Kojima, Yoichi, Ueda, Mikito
• Format: Article
• Language: English
• ISSN: 1938-5862; 1938-6737
• DOI: 10.1149/10914.0055ecst

To produce high-purity Al from Al–Cu alloys, the dissolution behaviors of various Al–Cu binary alloy anodes in EmImCl–AlCl 3 ionic liquid have been investigated at 323 K. In the constant potential electrolysis of the Al–5.0Cu casting alloy and cold-rolled plate at 0.3 V, Al atoms in the matrix phase were preferentially dissolved followed by the formation of Al 2 Cu surface species. The dissolution of both Al 2 Cu and Al in the alloy matrix occurred during electrolysis at 0.8 and 1.2 V. Moreover, a Cu-rich layer derived from Al 2 Cu was formed on the cold-rolled plate surface at a potential of 0.8 V and high electric charge densities. From the results, potential dependence of the anodic dissolution of the Al−Cu alloys in the ionic liquid was clarified.