Stainless steel pickling passivation is a commonly used surface treatment method to remove oxide film, rust and impurities on the surface of stainless steel to improve the corrosion resistance and appearance quality of stainless steel. The surface of stainless steel after pickling and passivation will show a special appearance effect, and this article will introduce the effect of stainless steel after pickling and passivation.
First, the principle of pickling passivation.
The principle of pickling passivation of stainless steel is to use the pickling liquid to have a chemical reaction with the surface of stainless steel to dissolve and remove the oxide film and impurities on the surface, and at the same time make the surface of stainless steel form a dense oxide film to improve the corrosion resistance of stainless steel. Commonly used pickling solutions include nitric acid, sulfuric acid, hydrochloric acid, etc., and different pickling solutions and treatment processes are selected according to different treatment requirements.
Second, the effect of pickling passivation.
1.Removal of oxide film and impurities.
During the production and transportation of stainless steel, the surface is susceptible to oxidation and pollution, forming a layer of oxide film and impurities. Pickling passivation treatment can effectively remove this layer of oxide film and impurities, so that the surface of stainless steel can restore its original luster and texture.
2.Improved corrosion resistance.
After pickling and passivation, a dense oxide film will be formed on the surface of stainless steel, which can effectively prevent air and moisture from contacting the stainless steel matrix, thereby improving the corrosion resistance of stainless steel. The corrosion resistance of stainless steel after pickling and passivation can be significantly improved.
3.Improve the quality of appearance.
Pickling passivation treatment can remove scratches, spots and other defects on the surface of stainless steel, making the surface of stainless steel smoother and smoother, presenting a bright and beautiful appearance. This can not only improve the quality of the product, but also enhance the visual impact of the product.
4.Improves adhesion and weldability.
Pickling passivation improves the adhesion and weldability of stainless steel surfaces, making it easier to paint and weld. This is of great significance for stainless steel products that need to be surface coated and welded.
3. Precautions for pickling passivation.
1.The selection of pickling solution and the formulation of treatment process should be selected and treated according to the material, surface condition and treatment requirements of stainless steel.
2.In the process of pickling passivation, the concentration, temperature and treatment time of the pickling solution should be strictly controlled to avoid excessive corrosion and surface roughness.
3.After pickling and passivation, it is thoroughly cleaned and dried to prevent residues from affecting the surface.