Chemical polishing of large stainless steel flanges is done by regular dissolving to smooth the flange surface.In the process of chemical polishing, the surface of large stainless steel flange forms passivated oxide film and oxide film, the former is stronger than the latter.
 

Due to the micro-inconsistency of the surface of large stainless steel flanges, the surface of the convex part is preferentially dissolved, the dissolution rate is higher than the concave part, and the film dissolution and film formation are always carried out at the same time, but the rate is different.So that large stainless steel flange surface smooth, bright.Polishing can fill pores, scratches and other surface defects, so as to improve the fatigue and corrosion resistance.
 

Electrochemical polishing is also called electropolishing.Electrolytic polishing takes large stainless steel flange as anode and insoluble metal as cathode.Both poles are immersed in the electrolytic cell at the same time, the direct current produces selective anodic dissolution, thus improving the surface brightness of the large stainless steel flange, achieving mirror effect.Eco-friendly electropolishing fluid formulations 1 and 2 do not require chromic anhydride, use less phosphoric acid, and reduce pollution emissions.