Electrodeposition of Al–Mo–Ti Ternary Alloys in the Lewis Acidic Aluminum Chloride–1-Ethyl-3-methylimidazolium Chloride Room-Temperature Ionic Liquid

Abstract

The electrodeposition of Al–Mo–Ti ternary alloys was examined in the Lewis acidic 66.7–33.3% mole fraction aluminum chloride–1-ethyl-3-methylimidazolium chloride room-temperature ionic liquid containing and . The Mo content in the alloys varied with the applied current density and the concentration ratio. The Ti content was small and constant at atomic fraction (a/o) and was independent of the deposition conditions. All the electrodeposited Al–Mo–Ti alloys were dense and compact and adhered well to the copper substrate. The deposit surface morphology depended on the applied current density and the Mo content of the alloys, as reported previously for the amorphous binary Al–Mo alloys. However, no amorphous glass phase could be detected in the Al–Mo–Ti ternary alloy samples; this behavior may be related to the presence of Ti. In summary, the addition of a small amount of Ti to the binary Al–Mo alloys resulted in a ternary alloy with a substantially improved chloride-induced pitting corrosion resistance compared to the related Al–Mo alloy.