Interfacial processes occurring at polycrystalline gold in acidic 1-ethyl-3-methytimidazolium chloroaluminate melts at room temperature, at potentials more positive than aluminum bulk deposition, include both Al underpotential deposition and the formation of Al/Au alleys. This information complements that reported in the literature for Al electrodeposition on Au in AlCl3/NaCl melts at temperatures of 200 degrees C and higher. Cyclic voltammetry and chronopotentiometry suggest that at least two alloys farm, and there is fast phase transformation between these intermetallic compounds at room temperature in the aluminum underpotential region. This transformation with thin gold films was slower than that in bulk gold electrodes.