Galvanostatic Pulse Plating of Cu-Al Alloy from the Lewis Acidic Aluminum Chloride-1-Ethyl- 3-methylimidazolium Chloride Melt

摘要

The electrodeposition of certain transition metal-aluminum alloys, notably Ag-Al, Co-Al, Cu-Al, Fe-Al, and Ni-Al, from the Lewis acidic composition of chloroaluminate molten salts such as AlCl3-1-emyl-3-methylirnidazolium chloride (AlCl3-EtMeImCl) falls under Brenner's classification of induced co-deposition, i.e., aluminum is co-deposited with the transition metal at potentials more cathodic than the potential at which bulk aluminum is normally electrodeposited. Lewis acidic chloroaluminate molten salts constitute a reservoir of the reducible chloroaluminate ions; in the case of the AlCl3-EtMeImCl and related organic salt-based systems, the major reducible species is Al2Cl7.