Golden composite coating prepared by physical vapor deposition method and preparation process thereof

The golden composite coating comprises a base material, a bottom layer, a buffer layer, a wear-resistant layer, a color layer and a protective layer are sequentially deposited on the surface of the base material from inside to outside, the bottom layer is a Ti metal layer, the buffer layer is a Ti and Si mixed layer, the wear-resistant layer is a composite layer formed by TiN and SiN, the color layer is a TiCN layer, and the protective layer is TiO. The prepared buffer layer enhances the bonding strength in the composite coating, the wear-resistant layer improves the bonding force and wear resistance of a film layer, the color layer has strong acid resistance and alkali resistance, and the protective layer is a protective film layer with high compactness, so that discoloration corrosion is effectively prevented; therefore, the preparation process is novel in design, simple in structure, high in hardness and high in corrosion resistance, the MIM part is provided with the color-changing-resistant golden film la