The high-temperature coloring method is a kind of chemical coloring method, which is divided into two types. One is to use the tempering method to oxidize the surface of the
stainless steel plate into golden yellow at a certain high temperature in the air. The second is to obtain a black film by oxidation in a molten bath of dichromate.
The low temperature coloring method can be divided into chemical coloring method and electrochemical coloring method. Among them, the chemical coloring method has an alkaline chemical coloring method and an acidic chemical coloring method.
The alkaline chemical coloring method is to color the stainless steel plate in an aqueous solution containing sodium hydroxide, an oxidizing agent and a reducing agent. The oxide film on the stainless steel surface does not need to be removed before coloring, and the oxide film is regrown on the naturally grown oxide film. Another alkaline chemical method is the vulcanization method. After the surface of the stainless steel plate is activated, it is then immersed in a solution containing sodium hydroxide and sulfide to vulcanize to form a black and beautiful vulcanized film, but the corrosion resistance is poor. .
The acid chemical coloring method is mainly some improvements made on the basis of the Inko method. The coloring base fluids are chromic acid and sulfuric acid. According to the method of applying electrical signals, it can be divided into current method and potential method. The advantage of the electrochemical coloring method is that the controllability and reproducibility of the color are very good. It is less affected by the surface condition of the stainless steel plate, and the processing temperature will be relatively low. Some processes can also be carried out at room temperature. smaller.
The organic matter coating and coloring method is a process of coating and coloring the surface of the stainless steel plate, which is coated on the stainless steel plate with transparent or opaque coloring paint. In the past, the use was limited due to the poor sealing of stainless steel plates and coatings. Until the 1980s, with the improvement of coating technology, the coating of coiled plates became a reality, so coated stainless steel plates, like colored galvanized iron plates and colored aluminum alloy plates, were widely used in building materials and other aspects. The important factors for coating stainless steel plate are the selection of the original stainless steel plate, the pretreatment method to ensure the adhesion, the selection of the coating with high corrosion resistance, and the correct coating and baking of the coating.
Enamel or cloisonné staining on stainless steel plate. Enamel or cloisonné on stainless steel can produce a smooth, glossy, patterned, colored hard surface similar to glass, but the problem of adhesion between the coating and stainless steel requires a high level of technology to solve. So it is mainly used for handicrafts.
The coloring method of non-ferrous metal plating is to plate non-ferrous metals on stainless steel plates, such as gold plating, black chrome plating, copper plating and other methods of coloring, especially continuous copper plating, which is widely used in industry.
