Commonly used stainless steel surface treatment technology has the following processing methods: 1. surface whitening treatment; 2. surface mirror bright treatment; 3. surface coloring treatment.
A. surface whitening treatment: stainless steel in the process, after winding, edge welding, or by artificial surface fire heating treatment, resulting in black oxide skin. The hard black oxide is mainly two components of EO4 NiCr2O4 and NiF, before using hydrofluoric acid and nitric acid corrosion removal method. But this method costs a lot, pollutes the environment, is harmful to the human body, and has a great corrosion, and is gradually eliminated. There are two main methods for the treatment of oxide coating at present:
Sand blasting (pill): the main method is to spray the micro glass beads to remove the black surface of the oxide skin.
Method: the chemical liquid with inorganic additives using a pollution-free pickling passivation cream and non-toxic cleaning solution at room temperature. So as to achieve the purpose of whitening stainless steel color. This method is suitable for large and complex products.
The surface of B. stainless steel mirror bright processing method: according to the complexity and the requirements of different users of stainless steel products can be used in mechanical polishing, chemical polishing, electrochemical polishing method to achieve specular gloss. The advantages and disadvantages of the three methods are as follows:
C. surface treatment: stainless steel coloring, not only gives stainless steel products of various colors, increase the variety of products, but also improve product wear resistance and corrosion resistance.
Stainless steel has a unique strength, high wear resistance, superior corrosion resistance and not easy to rust and other fine features. It is widely used in the chemical industry, food machinery, mechanical and electrical industry, environmental protection industry, household appliances industry and home decoration, decoration industry, to give people a sense of magnificent and noble.
The application prospect of stainless steel will be wider and wider, but the development of stainless steel will largely determine the extent of its surface treatment technology development.