Backward Curved Centrifugal Fan Impeller Wheel Anti Corrosion Coating

Backward Curved Impeller Wheel Epoxy Resin Coating Austenitic Stainless Steel Transport Media Anti-Corrosion Coating

Open impeller, front half open impeller, back half open impeller, closed impeller.

Open impeller has only blades and part of the back cover plate or no back cover plate;
Semi-open impeller is composed of blades and rear cover plate;
The closed impeller is composed of front and rear cover plates and blades.

The semi-open and open impeller in the vane impeller is easy to cast and can transport the medium containing certain solid particles, but because the solid particles wear the flow channel, the working efficiency of the pump will be reduced.

The closed impeller has high operation efficiency, can run smoothly for a long time, and the axial thrust of the pump is small, but the closed impeller is not easy to transport the sewage medium containing large particles or long fibers.

The corrosion and wear of fan impeller is mainly caused by corrosion and stress corrosion caused by corrosive gas in the fan conveying medium. The types of corrosion caused by different transport media are also different. In order to prevent corrosion and impeller corrosion and wear, the following measures are usually adopted: stainless steel with strong corrosion resistance is used as impeller material; Coating or spraying anti-corrosion layer on the surface of the impeller and improving the surface quality of the impeller to solve the corrosion and wear problem.
Fan impeller corrosion resistance spraying has surface thermal spraying and plasma spraying, etc. Spraying materials are nickel and nickel alloy wire, powder; Stainless steel wire, powder, etc. Nickel and nickel alloy spray coating to hydrogen sulfuric acid, phosphoric acid, hydrogen cyanide acid, hydrofluoric acid, acetic acid, ferrous sulfate solution and dry gas and other media, corrosion resistance is better, but to hydrochloric acid, nitric acid, potassium acetate, sulfite and other media, corrosion resistance is not good.
Austenitic stainless steel in stainless steel is used for thermal spraying more, such as 1Cr18Ni9Ti, has good processability, and has good corrosion resistance in most oxidizing media and some reducing media.
There are other methods of fan impeller corrosion resistance, such as rubber anti-corrosion coating, epoxy resin coating and so on. There are many wear resistance and anticorrosion methods of fan impeller. Due to the different working conditions of the fan operation system and the different manufacturing process methods of the impeller, the wear resistance and anticorrosion methods of the fan impeller are also different among enterprises.
Austenitic stainless steel (such as 1Cr18Ni9Ti) has low yield strength and is not suitable for the manufacture of high speed impeller, which is suitable for general low-speed fan anti-corrosion impeller material. In the medium containing CO2 and other corrosive gases and smoke, Cr13 stainless steel is mainly used, but attention should be paid to stress corrosion, and fan impellers requiring strong corrosion resistance and high speed are widely used martensite precipitation stainless steel, such as 0Cr17Ni4Cu4Nb and FV520B.

Key Features 

• Product as drawing.
• Customized
• Diameter :400-3500mm. 
• Material:Carton steel Q345, Staliness steel, Aluminium.Cast iron, bronze, stainless steel, manganese bronze, Monel, INCONEL, and non-metallic materials.Non-metallic material composition: PPS plastic, phenolic resin and so on
• Special Treatment: Wear-resisting processing, Surfacing welding processing.