Stainless steel has good corrosion resistance and mechanical properties. Although its production has a long history, in my country, stainless steel has only recently entered people's daily life with the rapid improvement of living standards. In addition to medical utensils and tableware, stainless steel materials are also widely used in kitchen utensils, stationery and other daily necessities. Another area that is increasingly using stainless steel is the decoration industry.
Many large shopping malls and restaurants use stainless steel stair handrails, stainless steel clad columns, stainless steel elevator doors and car interior walls, and so on. The decorative techniques have also developed from simple polishing to mirror polishing and embossing. Due to the inherent excellent corrosion resistance of stainless steel, it is often used without any coating, and its bare metal is used directly. In this way, we only see its true color - silver and white, which can sometimes feel a little monotonous. Thus, colored stainless steel came into being.
Surface coloring treatment: Stainless steel coloring not only gives stainless steel products various colors, increases the variety of products, but also improves the wear resistance and corrosion resistance of products. Stainless steel coloring methods are as follows:
(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) Chemical oxidation coloring method: It is the color of the film formed by chemical oxidation in a specific solution, including dichromate method, mixed sodium salt method, vulcanization method, acid oxidation method and alkaline oxidation method. Generally, "INCO" (INCO) is used more, but if you want to ensure the same color and luster of a batch of products, you must use a reference electrode to control.
(2) Electrochemical coloring method: It is the color of the film 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 coating. For example: titanium-plated watch cases and watch straps are generally golden yellow. This method is suitable for high-volume product processing. Because of the large investment and high cost, small batch products are not cost-effective.
(4) High temperature oxidation coloring method: In a specific molten salt, 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) Gas-phase cracking coloring method: It is more complicated and less used in industry.
