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Anti corrosion measures of impeller

Date:Nov 17,2016

The corrosive wear of fan impeller is mainly caused by corrosive gases in the air transport medium. Different types of corrosion caused by different transport media are also different. In order to prevent corrosion and corrosion wear of the impeller, usually adopt the following measures: selection of corrosion resistance strong stainless steel impeller material; in the impeller surface coating or spray coating and improve the surface quality of the impeller in order to solve the problem of corrosion and wear.

Corrosion resistant wear resistant material

The low yield strength of austenitic stainless steel (such as 1Cr18Ni9Ti), which is not suitable for the high speed impeller, is suitable for the general low speed wind turbine corrosion protection. The main use of Cr13 stainless steel with corrosive gases and smoke in the medium containing CO2, but should pay attention to stress corrosion, fan impeller and high corrosion resistance and high speed is the widespread use of martensitic precipitation stainless steel, such as 0Cr17Ni4Cu4Nb and FV520B etc..

The anti-corrosion layer coating

Amorphous nickel - phosphorus alloy (Ni-P) is a kind of anti-corrosive coating method in recent years, more successful. The structure and properties of amorphous alloy coatings ideal, avoid intergranular corrosion and grain boundary defects, hardness is HRC50 ~ Ni-P 70 alloy coating corrosion resistance, wear resistance and of hydrochloric acid, sulfuric acid, phosphoric acid and caustic corrosion resistance.

Fan impeller surface coating of amorphous nickel - phosphorus alloy (Ni-P) is a good method for resistance of corrosion process, our company has successfully used in fan Ma'anshan Steel Corp and Wuhan Iron and Steel Corporation, the effect is good.

Spray coating on the corrosion resistance layer of impeller

Fan impeller corrosion resistance of spray coating and plasma spray coating, etc.. The spraying material is nickel and nickel alloy wire, powder, stainless steel wire, powder, etc.. Nickel and nickel alloy spraying layer on hydrogen sulfate, phosphoric acid, hydrofluoric acid, hydrogen cyanide, acetic acid, ferrous sulfate solution and dry gas, good corrosion resistance, but of hydrochloric acid, nitric acid, acetic acid, potassium sulfite medium, the corrosion resistance is not good.

Austenitic stainless steel used for thermal spraying more, such as 1Cr18Ni9Ti, has a good process, in most of the oxidation of the medium and some of the reduction of the medium has better corrosion resistance. My company in Yunnan Tin Industry Company fan impeller surface thermal spray 1Cr18Ni9Ti, the application effect is good.

Fan impeller corrosion resistance there are some other methods, such as rubber anti-corrosion coatings, epoxy resin coatings, etc.. My company to the centrifugal fan impeller with the Chesterton company's 897 surface with the composite material to do some corrosion resistance test, the effect is good. Fan impeller wear and corrosion protection methods are more, the fan operating system conditions and the impeller manufacturing process of different restrictions, the wind turbine impeller wear and corrosion methods of various enterprises also have differences.

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