Surface modification process for stainless steel

The method for modifying the surface of rustless steel belongs to the metal surface processing technique. The method comprises the steps of: pre-processing a rustless steel product through a normal method and then taking the rustless steel product as an anode to carry out anode polarization treatment, wherein the treatment process is to process the surface of the rustless steel by adding citrate and nitrate additive into electrolyte solution of citric acid and boric acid and controlling the current concentration and the polarization time. The corrosion resistance of the rustless steel product processed through the method is greatly improved while the self physical properties such as the surface color, the lustrousness, the strength, the electricity conductivity, the heat conductivity and the like are not changed. The method has simple technique and equipment and convenient operation, and is easy to industrialize.