The Ag-Cu-RE（Ce） amorphous films were prepared on surface of die casting aluminum alloy by high vacuum ion beam sputtering method to improve its surface roughness.SEM（scanning electron microscope） and AFM（atomic force microscope） were employed to observe the surface morphology of the films.The results reveal that the film surface exhibits uniform and smooth

which can prevent the pitting corrosion from aluminum alloy.Electrochemical measurements show that the corrosion potential of the films is significantly higher than that of the aluminum substrate.In the corrosion tests

the amorphous films can desirably protect the aluminum substrate as a result of absence of exfoliation

significantly improving the corrosion resistance of aluminum alloy.