What are the methods for polishing stainless steel flanges
Apr. 12, 2021
The chemical polishing of stainless steel flange is that the surface of the flange is bright and smooth through regular dissolution. In the chemical polishing process, the passive oxide film and the oxide film are continuously formed on the surface of the large-scale stainless steel flange of steel, and the former is stronger than the latter. Due to the microscopic inconsistency of the surface of the large stainless steel flange, the surface microscopic convex parts are preferentially dissolved, and the dissolution rate is greater than the dissolution rate of the concave parts; and the dissolution of the film and the formation of the film always proceed at the same time, but the rate is different. The surface roughness of the steel large stainless steel flange can be leveled, and the flange can obtain a smooth and bright surface. Polishing can fill surface pores, scratches and other surface defects, thereby improving fatigue resistance and corrosion resistance.
Electrochemical polishing is also called electrolytic polishing. Electrolytic polishing uses the large stainless steel flange to be polished as the anode and the insoluble metal as the cathode. The two poles are immersed in the electrolytic cell at the same time, and direct current is applied to produce selective anode dissolution, thereby increasing the brightness of the surface of the large stainless steel flange. Mirror effect. Environment-friendly electro-polishing liquid formulations 1 and 2 do not use chromic anhydride and use less phosphoric acid. This formulation reduces pollution emissions. The formula does not use phosphoric acid and chromic anhydride at all, which solves the environmental problem of wastewater discharge. It is a new type of pollution-free and environmentally friendly electrochemical polishing agent. The process flow such as the process conditions is basically the same as the original one, and the polishing effect is also Basically the same, to ensure the polishing quality. During the production process, the surface of stainless steel is prone to some black oxide scale or microscopic inequality, which affects its use value. Only its reprocessing such as mechanical polishing, chemical polishing and electrochemical polishing can improve its own value, so the following process may be recommended to obtain better results.