Polishing Methods for Duplex Steel Flanges

Release time：

2022-06-08 15:48

1. The polishing methods of dual-phase steel flanges are manual, mechanical, chemical and electrochemical. The corrosion resistance and decoration of the flange can be improved by polishing. The existing stainless steel electropolishing solution still uses phosphoric acid and chromic anhydride. During the polishing and cleaning process, some chromium and phosphorus will be discharged into the waste water. pollution of the environment.

2. A passive film will be formed on the surface of the dual-phase steel flange, and the oxide film will begin to dissolve. Because the surface of the dual-phase steel flange is microscopically inconsistent, the microconvex part on the surface dissolves preferentially, and the dissolution rate will be greater than that of the concave part. The film dissolves and forms at almost the same time, but its speed is different. As a result, the surface roughness of the duplex steel flange is reduced, resulting in a smooth, shiny surface.

3. By polishing, some surface defects such as surface pores and scratches can be filled, thereby improving fatigue resistance and related corrosion resistance. The yield strength of duplex steel flanges is more than double that of austenitic stainless steel, and it has sufficient plasticity and toughness for this forming, as well as excellent resistance to stress corrosion cracking, especially in chloride ion environments.

Duplex Steel Flanges,polishing

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