Surface coloring: Stainless steel coloring not only gives various colors to stainless steel products, increases the variety of colors of the products, but also improves the wear resistance and corrosion resistance of the products. Stainless steel coloring methods are as follows:
(1) Chemical Oxidation Coloring: The color of a film formed by chemical oxidation in a specific solution includes the dichromate method, the mixed sodium salt method, the sulfurization method, the acid oxidation method, and the alkaline oxidation method. In general, INCO is used more often, but in order to ensure that the color of a batch of products is consistent, reference electrodes must be used for control.
(2) Electrochemical Oxidation Coloring: It is the color of the film formed by electrochemical oxidation in a specific solution.
(3) 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, watch bands, are generally golden yellow. This method is suitable for processing large quantities of products. Because of the large investment and high cost, small-volume products are uneconomical.
(4) High-temperature oxidation coloring method: In a specific molten salt, the immersed workpiece is kept at a certain process parameter, so that the workpiece forms a certain thickness of oxide film, and presents various colors.
(5) Gas phase pyrolysis coloring method: It is more complicated and less applied in industry.
Description: Which method is used for stainless steel surface treatment depends on the product structure, material, and different surface requirements.