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Chemical pump materials can be selected according to the different media they choose to transport different materials, so that when the pump to avoid the transmission of unwanted damage, as well as major accidents. The following is the chemical pump material selection points: Chemical pump material selection 1, sulfuric acid as one of the strong corrosive media is a very broad use of important industrial raw materials. Different concentrations and temperatures of sulfuric acid on the corrosion of materials vary greatly, for the concentration of more than 80%, the temperature is less than 80 ℃ of concentrated sulfuric acid, carbon steel and cast iron has good corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid, Not suitable for pump valve material; common stainless steel such as 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti) sulfuric acid medium is also limited use. Therefore, the delivery of sulfuric acid pump valve is usually made of high silicon cast iron (casting and machining difficult), high alloy stainless steel (No. 20 alloy), fluorine plastic has good resistance to sulfuric acid using fluorine pump (F46) is a more Economic choice. Companies applicable products are fluoride plastic chemical centrifugal pumps, FP FS series of plastic corrosion-resistant pumps, CQB-F-type fluorine plastic magnetic drive pumps. 2, hydrochloric acid solution Most of the metal materials are not resistant to hydrochloric acid corrosion (including a variety of stainless steel) molybdenum high ferrosilicon can only be used for 50 ℃, 30% hydrochloric acid. Contrary to metallic materials, most non-metallic materials have good corrosion resistance to hydrochloric acid, so lined rubber pumps and plastic pumps (such as polypropylene, fluoroplastic, etc.) are the best choice for the delivery of hydrochloric acid. 3, nitric acid Most metals are mostly corrosive in nitric acid corrosion damage, stainless steel is the most widely used nitric acid material, all concentrations of nitric acid at room temperature have good corrosion resistance It is worth mentioning that the stainless steel containing molybdenum (such as 316 , 316L) of nitric acid corrosion resistance, not only not superior to ordinary stainless steel (such as 304,321) sometimes even worse, and for high temperature nitric acid is usually used titanium and titanium alloy materials. 4, acetic acid It is one of the most corrosive substances in organic acids, ordinary steel in all concentrations and temperatures of acetic acid will be severely corrosive, stainless steel is an excellent acid-resistant materials, molybdenum 316 stainless steel can also be suitable for high temperature and Dilute acetic acid steam. For high temperature and high concentration of acetic acid or other corrosive media containing harsh requirements such as the choice of high-alloy stainless steel pump or fluorine plastic pump. 5, alkali (sodium hydroxide) Steel is widely used below 80 ℃, 30% concentration of sodium hydroxide solution, there are many factories at 100 ℃, 75% below the ordinary steel is still used, although the corrosion increases but the economy is good. Ordinary stainless steel corrosion resistance of lye compared with cast iron has no obvious advantages as long as the medium allows a small amount of iron mixed with stainless steel is not recommended. For high temperature alkaline use of titanium and titanium alloy or high alloy stainless steel, the company generally cast iron pump can be used for low temperature lye at room temperature special requirements can be used when all kinds of stainless steel pump or fluorine plastic pump. 6, ammonia (ammonia hydroxide) most of the metal and non-metallic liquid ammonia and ammonia (ammonia hydroxide) in the corrosion are mild copper and copper alloy should not be used, most of the company's products are suitable for ammonia and ammonia transport. 7, salt water (sea water) Ordinary steel in sodium chloride solution and seawater, salt water corrosion rate is not too high generally need to use paint protection; all kinds of stainless steel also has a low uniform corrosion rate but may be due to chloride ions caused by local corrosion usually 316 stainless steel is better, the company has 316 various types of chemical pump material configuration. 8, alcohols, ketones, esters, ethers common alcohol medium with methanol, ethanol, ethylene glycol, propanol and other ketones have acetone, butanone and so on, esters of various methyl ester media, B Esters, ethers medium ether, ether, butyl ether, etc., they are basically no corrosive common materials are applicable, the specific choice should be based on the media properties and related requirements to make a reasonable choice. Also of note is the ketone , Esters, ethers Soluble in a wide range of rubbers Avoid mistakes when choosing a seal. Read more: China Building Water Exhibition Pump Valve Tube Fittings Exhibition Water Expo Xiamen Maritime Exhibition Internet + Forum Yiwu Expo Industry Interconnection (Xiamen) Technology Co., Ltd. Asia Pump Network Editor: He Duanhui (QQ / WeChat:) http://beng.liuti.cn/ (service hotline:)