Strong corrosion resistance and process requirements of FFU centrifugal fan impeller

- Sep 25, 2018 -

The corrosion wear of the FFU centrifugal fan impeller is mainly caused by corrosion and stress corrosion caused by corrosive gases in the fan conveying medium. In the operation, due to the difference of the transport medium, the types of corrosion caused during the operation are also different, coating or spraying the anti-corrosion layer on the surface of the impeller and improving the surface quality of the impeller to solve the problem of corrosion and wear.

The FFU centrifugal fan impeller is suitable for use as a general low-speed fan anti-corrosion impeller material. In the case of a medium containing corrosive gas such as CO2 and smoke, Cr13 type stainless steel is mainly used, but stress corrosion is required, and a fan impeller with high corrosion resistance and high rotation speed is widely used, such as 0Cr17Ni4Cu4Nb and FV520B. Wait.

To some extent, the FFU centrifugal fan impeller avoids grain boundary corrosion and grain boundary defects due to its ideal amorphous structure and alloy properties of the coating. The Ni-P alloy coating with HRC 50-70 hardness is corrosion-resistant and wear-resistant. Damage to hydrochloric acid, sulfuric acid, phosphoric acid and caustic soda. The surface of the fan impeller is coated with amorphous nickel-phosphorus (Ni-P) alloy as a good corrosion resistance process.

FFU centrifugal fan impeller has good processability, good corrosion resistance in most oxidizing media and some reducing media, and other methods of corrosion resistance of fan impeller, such as rubber anticorrosive coating, epoxy resin Coatings, etc. There are many methods for the wear and anti-corrosion of the fan impeller. Due to the different working conditions of the fan operating system and the impeller manufacturing process, the wear-resistant and anti-corrosion methods of the fan impeller are also different.