A new method for practical electrodeposition of aluminium from ionic liquids

Abstract

Successful electrodeposition of aluminium from ionic liquids has been long achieved scientifically. Nevertheless, standard industrial procedures have not yet been established due to the difficulties associated with using closed system filled with inert gas for the electrodeposition process. This paper presents a new methodology in which electrodeposition of aluminium is conducted in air, after preparation of ionic liquids in a glove box and covering them by a nonwater-absorbable layer of particular organic compound. This compound is stable and shows no reaction with the ionic liquid. Using this newmethodology, functional aluminiumlayerswere successfully deposited from a first generation ionic liquid AlCl3/1-ethyl-3-methylimidazolium chloride - [EMIm]Cl - (60/40 mol%) on low carbon steel. Cyclic voltammetry (CV) measurements revealed that therewas no significant difference in electrochemical properties characteristic of Al deposition when conducted in open air. SEM/EDX assessments showed that uniform, dense and adherent Al layers were obtained. Adherence of Al to the steel substrate was improved via in-situ electrochemical etching.