How are stainless steel fans corrosion resistant?

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【Brief Description】Centrifugal fan manufacturer found in the purchase of stainless steel fan is to choose according to their own business situation whether they need to have anti-corrosion function or acid and alkali resistance, clear procurement goals, the purchase of stainless steel fan can be used for a longer period of time, more efficient.

　　Centrifugal fan manufacturer found in the purchase of stainless steel fan is to choose according to their own business situation whether they need to have anti-corrosion function or acid and alkali resistance, clear procurement goals, the purchase of stainless steel fan can be used for a longer period of time, more efficient.

　　Some enterprise customers choose anti-corrosion function of stainless steel fan, because the fan conveying medium contains corrosive gases due to its corrosion and stress corrosion will lead to fan impeller corrosion and wear. And because of the different conveying medium, caused by the type of corrosion is not different. In order to prevent the occurrence of corrosion and impeller corrosion and wear, centrifugal fan manufacturers usually use the following measures:

Corrosion and wear-resistant materials
　　Austenitic stainless steel (such as 1Cr18Ni9Ti) yield strength is low, not suitable for manufacturing high speed impeller, applicable as a general low-speed fan corrosion-resistant impeller materials. In the medium containing CO2 and other corrosive gases and fumes with Cr13 type stainless steel, but should pay attention to stress corrosion, and the requirements of corrosion resistance of high speed fan impeller is widely used martensitic precipitated stainless steel, such as 0Cr17Ni4Cu4Nb and FV520B.

Impeller corrosion-resistant layer coating
　　Amorphous plating nickel - phosphorus (Ni-P) alloy is a more successful surface corrosion coating method. Due to the ideal amorphous structure and the alloy properties of the coating, to avoid grain boundary corrosion and grain boundary defects, plating hardness of HRC50 ~ 70 Ni-P alloy plating corrosion resistance, wear resistance and corrosion resistance to hydrochloric acid, sulfuric acid, phosphoric acid and caustic soda.

　　Fan impeller surface coating amorphous plating nickel-phosphorus (Ni-P) alloy as a good corrosion-resistant process.

Impeller corrosion-resistant layer spraying
　　Fan impeller corrosion resistant spraying surface thermal spraying and plasma spraying. Spraying materials are nickel and nickel alloy wire, powder; stainless steel wire, powder and so on. Nickel and nickel alloy spray layer of hydrosulfuric acid, phosphoric acid, hydrogen cyanide, hydrofluoric acid, acetic acid, ferrous sulfate solution and dry gas and other media, corrosion resistance is better, but for hydrochloric acid, nitric acid, potassium acetate, sulfurous acid and other media, corrosion resistance is not good.

　　Stainless steel in the austenitic stainless steel used for thermal spraying more, such as 1Cr18Ni9Ti, has a good process, in most of the oxidizing media and some reducing media have good corrosion resistance.

　　Of course, centrifugal fan manufacturer said fan impeller corrosion resistance there are some other methods, such as rubber anti-corrosion coatings, epoxy resin coatings and so on. Fan impeller wear-resistant and corrosion-resistant methods more, by fan operating system conditions and impeller manufacturing process method of different limitations, fan impeller wear-resistant and corrosion-resistant methods of each enterprise also has differences.