Anticorrosion measures for impeller

Release time:

2022-04-27

The corrosion and wear of the fan impeller are mainly caused by the corrosion and stress corrosion caused by the corrosive gas contained in the conveying medium of the fan. The types of impeller corrosion caused by different conveying media are also different.

quality impeller

To prevent the occurrence of corrosion and impeller corrosion and wear, the following measures are usually adopted: choose stainless steel with strong corrosion resistance as the impeller material; coat or spray the anti-corrosion layer on the surface of the impeller and improve the surface quality of the impeller to solve the problem of corrosion and wear.

Impeller's corrosion and wear-resistant materials:
Austenitic stainless steel has low yield strength and is not suitable for manufacturing impellers with high rotational speed. It is suitable for general low-speed fan anti-corrosion impeller materials.
Cr13 stainless steel is mainly used in the medium containing CO2 and other corrosive gases and smog, but stress corrosion should be paid attention to, and the fan impeller that requires strong corrosion resistance and high speed is widely used martensitic precipitation stainless steel.

Coating of impeller corrosion-resistant layer:
Amorphous nickel-phosphorus (Ni-P) alloy plating is a relatively successful surface anti-corrosion coating method. Due to the ideal amorphous structure and the alloy properties of the coating, grain boundary corrosion and grain boundary defects are avoided. The Ni-P alloy coating with a coating hardness of HRC50-70 is resistant to corrosion, wear, and resistance to hydrochloric acid, sulfuric acid, phosphoric acid, and caustic soda. of strong corrosion resistance.
The surface of the fan impeller is coated with amorphous nickel-phosphorus (Ni-P) alloy as a good corrosion-resistant process method.

Spraying of impeller corrosion-resistant layer:
The corrosion resistance spraying of the fan impeller includes surface thermal spraying and plasma spraying. The spraying materials include nickel and nickel alloy wire, powder; stainless steel wire, powder, etc. Nickel and nickel alloy spray coatings have good corrosion resistance to hydrosulfuric acid, phosphoric acid, hydrogen cyanide, hydrofluoric acid, acetic acid, ferrous sulfate solution, dry gas, etc., but are resistant to hydrochloric acid, nitric acid, potassium acetate, sulfurous acid, and other media, the corrosion resistance is not good.

Austenitic stainless steel in stainless steel is used for thermal spraying more, has good manufacturability, and has good corrosion resistance in most oxidizing media and some reducing media.

There are other methods for the corrosion resistance of fan impellers, such as rubber anti-corrosion coatings, epoxy resin coatings, etc. There are many wear-resistant and anti-corrosion methods for fan impellers, which are limited by different operating conditions of the fan operating system and impeller manufacturing process methods.

Through the above introduction and analysis of the anticorrosion measures for impeller, hope it helps you.

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