There are many coloring methods for BS1387 EN10255 Hot dipped Galvanized steel pipe, the common ones are electrochemical oxygen dyeing, chemical oxidation dyeing, ion deposition oxidation dyeing, etc. The following is a brief introduction:
1. Electrochemical oxidation coloring method: It is a common method for coloring the surface of stainless steel pipes by generating a color film by electrochemical oxidation in a specific solution.
2. Chemical oxidation coloring: It is a color formed by chemical oxidation in a specific solution. It is composed of dichromic acid method, sodium salt mixture method, vulcanization method, acid oxidation method and alkaline oxidation method. Usually more "Inco method" (INCO) is used, but to ensure the same color of a batch of products, it must be controlled with a reference electrode.
3. Ion deposition oxidation coloring method: that is, placing the stainless steel workpiece on a vacuum coating machine for vacuum evaporation coating. For example, the case and strap are titanium-plated, generally golden yellow. This method is suitable for mass production processing. Due to the large investment and high cost, small batches of products are not cost-effective.
4. High temperature oxidation coloring: In a specific molten salt, the workpiece is immersed in certain process parameters, so that the workpiece forms an oxide film of a certain thickness, and at the same time presents various colors.