The surface corrosion of five types of precious dental alloys containing Au, AS and Cu caused by 1.0% Compound iodine glycerin in artificial saliva was studied by cyclic voltammetry and specular reflection spectroscopy. Electrooxidation of the alloy electrodes started at about -0.1 V rs SCE. The presence of iodine on the anodically polarized alloy was confirmed by XPS. The rest potential of the alloys in contact with artificial saliva containing 1.0% Compound iodine glycerin was more positive than -0.1 V, where CuI and/or AgI were formed.