Electrodeposition of Al-Mo alloys from the lewis acidic aluminum chloride-1-ethyl-3-methylimidazolium chloride molten salt

• Published in: Journal of the Electrochemical Society Vol. 151; no. 6; pp. C379 - C384
• Main Authors: TSUDA, Tetsuya, HUSSEY, Charles L, STAFFORD, Gery R
• Format: Journal Article
• Language: English
• Published: Pennington, NJ Electrochemical Society 2004
• Subjects: Cross-disciplinary physics: materials science; rheology; Electrodeposition, electroplating; Exact sciences and technology; Materials science; Methods of deposition of films and coatings; film growth and epitaxy; Physics; Corrosion resistance; Scanning electron microscopy; Aluminium base alloys; Corrosion potential; Electrodeposition; Lattice parameters; Fused salt electrolyte; Surface structure
• ISSN: 0013-4651; 1945-7111
• DOI: 10.1149/1.1704611

The electrodeposition of aluminum-molybdenum alloys was examined at copper rotating disk and wire substrates in the Lewis acidic 66.7-33.3 mol % aluminum chloride-1-ethyl-3-methylimidazolium chloride molten salt containing Mo(II) in the form of dissolved (Mo6Cl8)Cl4. The molybdenum content of the electrodeposits depended on the electrode rotation rate, Mo(II) concentration, and bath temperature. It was possible to produce nonequilibrium alloys containing up to 11 atom % Mo. These alloy deposits were compact and chloride-free. Al-Mo alloys containing more than 8 atom % Mo exhibited a chloride corrosion pitting potential of approximately +800 mV against pure aluminum. The corrosion resistance of this alloy is superior to that of all the aluminum-transition metal alloys that have been electrodeposited to date from chloroaluminate molten salts.