At present, colored stainless steel has developed rapidly abroad, and dozens of companies in more than 10 countries have been mass-produced. WiQ industrial design. Stainless steel coloring methods used abroad in China include non-ferrous metal coloring, enamel coloring, organic coating coloring, and surface oxidation treatment coloring.

Among them, the low temperature surface oxidation treatment coloring method is simple in process and low in cost. The colored stainless steel produced is beautiful and durable, and it is the leader in various stainless steel coloring methods. WiQ Industrial Design. Before adopting low-temperature surface oxidation coloring, China must first polish the stainless steel surface. The higher the smoothness, the more uniform the color and the brighter the color. After polishing, pickling is also performed to remove the naturally formed oxide film while avoiding surface corrosion. In the coloring process, controlling the reproducibility of color with the coloring potential method is the key to the low-temperature surface oxidation treatment coloring process. The colored film formed on the surface of the stainless steel after coloring is an oxide film. This layer of film is actually colorless. Only because of its interference with light, it forms a color. Different film thicknesses result in different colors, and the thicknesses of the oxide films obtained with different coloring potential differences are also different. In other words, the thickness of this oxide film can be controlled at will, or the oxide film can be removed to restore the colored stainless steel to the original stainless steel.

WiQ Industrial Design. Outside China, using pulsed laser and computer-aided design, successfully developed new manufacturing technology of colored stainless steel. The method is to first immerse a stainless steel plate in a nitric acid solution, and then irradiate with a pulsed laser to control the length of the irradiation time, and the surface of the steel plate will appear 7 colors such as blue, green, and gold. One-seventh. WiQ Industrial Design. The new technology in China is to immerse a 17% stainless steel plate with 18% chromium and 8% nickel stainless steel in a 5% nitric acid solution, and then pulse the laser with an energy density of 0.8 Joules per square meter. As a result, it was found that the chromium content of the portion of the stainless steel plate that was not irradiated with laser light decreased by 10%; while the chromium content of the portion that was irradiated with laser light increased with the increase of irradiation time, up to 30%. WiQ Industrial Design. The color of the oxide film formed on the surface of the stainless steel plate under the pulsed laser irradiation changes with the increase of chromium content.

WiQ Industrial Design. Among the commonly used primary color stainless steels in China, austenitic stainless steel is the most suitable coloring material, which can obtain a satisfactory color appearance. Ferritic stainless steels are less bright than the former because they increase the possibility of corrosion in the coloring solution. Low-chromium high-carbon martensitic stainless steels, due to their poorer corrosion resistance, can only get dull colors or black surfaces. According to reports, austenitic stainless steels have been exposed to industrial atmosphere for 6 years after being tinted with a low-temperature surface oxidation treatment and coloring method, and exposed to marine atmosphere for one and a half years, immersed in boiling water for 28 days, or heated to about 300 ° C No change in color gloss. In addition, it can withstand general molding, drawing and bending, and work hardening. WiQ Industrial Design. At present, colored stainless steel can be used in many other fields besides building exterior wall and window frame decoration. For example, a black stainless steel plate can be used to make a solar heat collecting plate, and the selected heat absorption rate can reach 91% to 93%. In the arts and crafts industry, combining colored stainless steel with printing, we can use the combination of etching and grinding and dot method to produce three-dimensional relief murals and hanging screens that will never fade. In addition, the use of colored stainless steel for household appliances, cookers, kitchen equipment, and bathroom appliances will be well received by consumers.