Surface coloring treatment The coloring of stainless steel not only imparts various colors to stainless steel products, increases the variety of products, but also improves the wear resistance and corrosion resistance of the products.
There are several coloring methods for stainless steel:
1. Chemical oxidation coloring method;
2. Electrochemical oxidation coloring method;
3. Ion deposition oxide coloring method;
4. High temperature oxidation coloring method;
5. Gas phase cracking coloring method.
A brief overview of the various methods is as follows:
1. The chemical oxidation coloring method is to form the color of the film through chemical oxidation in a specific solution. There are dichromate method, mixed sodium salt method, sulfurization method, acid oxidation method and alkaline oxidation method. In general, "INCO" (INCO) is used more, but if you want to ensure the color of a batch of products are consistent, you must use a reference electrode to control.
2. The electrochemical coloring method is to form the color of the film through electrochemical oxidation in a specific solution. 3. The chemical method of ion deposition oxide coloring method is to place the stainless steel workpiece in a vacuum coating machine for vacuum evaporation plating. For example: titanium-plated watch cases and watch bands are generally golden yellow. This method is suitable for mass product processing. Because of the large investment and high cost, small batch products are not economical.
4. High-temperature oxidation coloring method is to immerse the workpiece in a specific molten salt to maintain a certain process parameter, so that the workpiece forms a certain thickness of oxide film, and presents a variety of different colors. 5. Gas-phase pyrolysis coloring method The gas-phase pyrolysis coloring method is more complicated and less applied in industry. Fourth, the choice of treatment method Which method to choose for the surface treatment of stainless steel, according to the product structure, material, and different requirements on the surface, select the appropriate method for treatment.