Electrodeposition of aluminum on magnesium alloy in aluminum chloride (AlCl3)-1-ethyl-3-methylimidazolium chloride (EMIC) ionic liquid and its corrosion behavior

A dense and adhesive A1 layer was successfully electrodeposited on a Mg alloy in aluminum chloride- l-ethyl-3-methylimidazolium chloride ionic liquid. The corrosion resistance of the uncoated and AI-coated samples was evaluated by electrochemical impedance spectroscopy and potentiodynamic polarization measurements in 3.5 wt% NaCl solution. It was confirmed that the protective A1 layer significantly reduces the corrosion rate of the Mg alloy. However, the deposition potential was a crucial factor that governed the structure and therefore the protection capability of the Al layer. (C) 2007 Elsevier B.V. All rights reserved.