(1) Chemical oxidation coloring method: the color of the film is formed by chemical oxidation in a specific solution, including dichromate method, mixed sodium salt method, vulcanization method, acid oxidation method and Alkaline Oxidation. Generally, "Inco method" (INCO) is used more, but if you want to ensure the same color of a batch of products, you must use the reference electrode to control.
(2) Electrochemical coloring method: the color of the film is formed by electrochemical oxidation in a specific solution.
(3) Chemical method of ion deposition oxide coloring method: the stainless steel workpiece is placed in a vacuum coating machine for vacuum evaporation plating. For example: titanium-plated watch cases and watch straps are generally golden yellow. This method is suitable for high-volume product processing. Because of large investment and high cost, small batch products are not cost-effective.
(4) High-temperature oxidation coloring method: in a specific solution, the workpiece is immersed in a certain process parameter, so that the workpiece forms a certain thickness of oxide film and presents various colors.
(5) Vapor-phase pyrolysis coloring method: it is more complicated and less used in industry.
