The Electrodeposition of an Aluminum‐Manganese Metallic Glass from Molten Salts

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Abstract
The electrodeposition of binary aluminum‐manganese alloys from chloroaluminate molten salts is reported. The manganese content of the electrodeposit varies from 7 to 30 w/o and is dependent upon deposition potential and the relative concentrations of and Mn++ in the melt. At small cathodic overpotentials the deposition process, with respect to alloy composition, is kinetically controlled. At larger cathodic overpotentials, it becomes mass transport limited in Mn++and then . The most uniform and brightest deposits are obtained at a constant potential of −0.3V with respect to an aluminum wire in the same electrolyte. The potential dependence of alloy composition allows one to create homogeneous, graded and modulated structures from a single electrolyte. The structure of the as‐deposited alloy appears to be that of a metallic glass above 27 w/o manganese and a mixture of glass and supersaturated aluminum below 27 w/o. Heating to 400°C converts the deposit containing less than 26 w/o Mn to a mixture of the orthorhombic intermetallic and aluminum. The ability to electrodeposit intermetallic compounds on a near atomic scale presents interesting possibilities for high temperature alloys.

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