Abstract:

Aluminum was successfully electrodeposited on stainless steel electrodes from aluminum chloride（AlCl₃）/triethylamine hydrochloride（Et₃NHCl）ionic liquids by constant current electrolysis under magnetic stirring conditions. The electrical conductivities of ionic liquids increased as the electrolyte temperature increased，agreeing with Arrhenius equation. The viscosities of ionic liquids decreased as the electrolyte temperature increased，with a linear relationship of lnμ and T^－1. The constant current deposition experiments showed that when the stirring speed was lower than 700 r/min，current efficiency and deposition rate increased as the speed increased，the surface morphology of the deposits became more smooth and denser，with fine particle sizes and uniform distribution. In addition，the electrodeposits obtained on stainless steel electrodes were dense，continuous，and well adherent，and the current efficiency was 78% at a current density of 22 mA/cm² for 90 min electrolysis at 70 ℃ under stirring speed of 700 r/min. The purity of aluminum electrodeposits on stainless steel electrodes was about 97%（w/w）.