Commonly used stainless steel surface treatment technology has the following several treatment methods: 1. 2. Surface mirror gloss treatment; 3. Surface coloring treatment.
A. Surface whitening treatment: during the processing of stainless steel, it will be rolled up, bound, welded or heated by fire on artificial surface to produce black oxide skin. This kind of hard gray black oxide coating is mainly composed of NiCr2O4 and NiF EO4 components. Previously, hydrofluoric acid and nitric acid were generally used for strong corrosion removal. However, this method costs a lot, pollutes the environment, is harmful to human body, and is corrosive, so it is gradually eliminated. At present, there are mainly two treatment methods for scale oxide:
Sand blasting (shot) method: the main method is to spray glass beads, remove the surface of the black oxide.
Chemical method: use a kind of pollution-free pickling passivation paste and room temperature non-toxic cleaning solution with inorganic additives for leaching. So as to achieve the purpose of stainless steel whitening treatment. After treatment, it basically looks like a matte color. This approach is more suitable for large and complex products.
B. Mirror gloss treatment of stainless steel: mechanical polishing, chemical polishing, electrochemical polishing and other methods can be used to achieve mirror gloss according to the complexity of stainless steel products and different requirements of users. The advantages and disadvantages of these three methods are as follows:
C. Surface coloring: Stainless steel coloring not only endowing stainless steel products with various colors and varieties, but also improving their wear resistance and corrosion resistance.
Stainless steel has unique strength, high wear resistance, superior anti-corrosion performance and not easy to rust and other good characteristics. Therefore, it is widely used in chemical industry, food machinery, mechanical and electrical industry, environmental protection industry, household appliances industry and home decoration, fine decoration industry, giving people a magnificent and noble feeling.
The application development prospect of stainless steel will be more and more extensive, but the application development of stainless steel largely determines its surface treatment technology development degree.
