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Knowledge about selection of corrosion resistant centrifugal pump

Number of clicks:8022018-07-31 09:27:29 source: Shenzhou City Yueda Pump Industry Co.,Ltd.Industrial and mining slurry pumps, swirler and fittings, pump parts, rubber parts, polyurethane parts production, sales;

     Corrosion can be divided into two categories: wet corrosion and dry corrosion. Wet corrosion refers to the corrosion of metal materials in the presence of water, while dry corrosion refers to the corrosion in dry gas without liquid water. Wet corrosion is the most common cause in the chemical production of the atmosphere, and the damage caused by dry corrosion at high temperature can not be ignored.

     Below for some commonly used chemical media to talk about corrosion resistant centrifugal pump selection points:
     1. sulfuric acid as one of the strong corrosive medium, sulfuric acid is an important industrial raw material widely used. The corrosion of sulfuric acid with different concentrations and temperatures has a greater corrosion resistance to the concentrated sulphuric acid carbon steel and cast iron with a concentration above 80 and less than 80 C, but it is not suitable for high speed flow sulfuric acid as a pump valve. The common stainless steel, such as 3040Cr18Ni9 and 3160Cr18Ni12Mo2Ti, is also limited to the sulphuric acid medium. Therefore, the pump valves for transporting sulphuric acid are usually made of high silicon cast iron and difficult to process. High alloy stainless steel 20 alloy is made, but it is difficult to process and is expensive, so it is not good for people. The fluoroplastic alloy has a very good resistance to sulphuric acid. It is the patent material of the Shanghai Institute of organic chemistry of the Chinese Academy of Sciences. The patent technology introduced by our company in 1985 was first developed and produced by the Chinese Academy of Sciences. It has been proved that there is no chemical medium and the reaction to be produced by the Chinese Academy of Sciences at present. Therefore, the fluorine pump F46 is used. It is a more economical choice. The products of three Chang company are IHF type fluoroplastic chemical pump, FSB type fluoroplastic centrifugal pump, IGF type fluorine lining pump, PF type corrosion resistant centrifugal pump, CQB-F type fluoroplastic magnetic pump and so on.

     2. Hydrochloric acid medium is not resistant to hydrochloric acid corrosion of most metal materials, including various stainless steel materials containing molybdenum and ferrosilicon can only be used for hydrochloric acid below 50 C and 30 C. In contrast to metal materials, most non-metallic materials have good corrosion resistance to hydrochloric acid, so lining rubber pumps and plastic pumps, such as engineering plastics and fluoroplastics, are the best choice for hydrochloric acid delivery. Three Chang company applies fluorine plastic chemical pump series.The corrosion resistance of 

      3. nitric acid is most widely used in nitric acid. The most widely used nitric acid centrifugal pump has good corrosion resistance to all the nitric acid at normal temperature. It is worth mentioning that the corrosion resistance of stainless steel containing molybdenum, such as 316, 316L, is not better than ordinary stainless steel, such as 304, 321 sometimes. Not even as good as it is. For high temperature nitric acid, fluoroplastic alloy is usually used. The products of three Chang company are IHF type fluoroplastic chemical pump, FSB type fluoroplastic centrifugal pump, IGF type fluorine lining pump, PF type corrosion resistant centrifugal pump, CQB-F type fluoroplastic magnetic pump and so on.

     4. acetic acid is one of the most corrosive substances in organic acids. Ordinary steel will seriously corrode stainless steel in all concentrations and temperatures of acetic acid. 316 stainless steel is excellent for acetic acid and can be applied to high temperature and dilute acetic acid steam. High alloy stainless steel magnetic pump or fluoroplastic chemical pump, such as CQB type stainless steel magnetic pump, CQ type magnetic drive pump, stainless steel pipe centrifugal pump, stainless steel chemical pump, can be selected for high temperature and high concentration acetic acid or other corrosive medium.
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