Corrosion-resistant chemical pump material selection
October 11 22:07:51, 2023
Erosion has always been one of the most troublesome hazards of chemical equipment, a slight mistake, ranging from damage to equipment, heavy cause accidents and even lead to disaster. According to the statistics, about 60% of the destruction of chemical equipment is caused by corrosion, so when choosing the corrosion-resistant chemical pump, we must pay attention to the scientificity of material selection first. Corrosion-resistant chemical pump material 1. Sulfuric acid as one of the strong corrosive medium, sulfuric acid is an important use of a wide range of 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 processing difficult), high alloy stainless steel (No. 20 alloy) manufacturing, but its processing is difficult and expensive, so people are not optimistic. Fluoroplastics alloy has very good resistance to sulfuric acid. It is the patented material of Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences. Our company introduced the patented technology in 1985 and the earliest use it to develop and produce corrosion-resistant chemical pump. After the experiment of the Chinese Academy of Sciences, There is no chemical medium to react with it, so using a fluorine-based pump (F46) is a more economical option. Company products are: IHF lining fluoride pump, FSB strong corrosion-resistant centrifugal pump, CQB fluorine plastic magnetic pump. 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. In contrast to metallic materials, the vast majority of non-metallic materials have good corrosion resistance to hydrochloric acid, so lined rubber pumps and plastic pumps (such as engineering plastics, fluoroplastics, etc.) are the best choice for the delivery of hydrochloric acid. Company products are: IHF lining pump, UHB corrosion-resistant centrifugal pumps, CQ engineering plastic magnetic pump (or fluorine plastic magnetic pump) and so on. 3. Nitric acid Most metals are mostly corrosive in nitric acid corrosion damage, stainless steel is the most widely used nitric acid-resistant materials, all concentrations of nitric acid at room temperature have good corrosion resistance, it is worth mentioning that the molybdenum-containing stainless steel (such as 316,316 L) corrosion resistance to nitric acid is not only not superior to ordinary stainless steel (such as 304,321), and sometimes even worse. For high temperature nitric acid, usually using fluorine plastic alloy material. Company products are: IH chemical pump, CQ stainless steel magnetic pump, ZCQ self-priming magnetic pump, CQB fluorine plastic alloy magnetic pump, FSB fluorine alloy centrifugal pumps. 4. Acetic acid It is one of the most corrosive substances in organic acids. Ordinary steel will be seriously corroded in all concentrations and temperatures of acetic acid. Stainless steel is an excellent acetic acid-resistant material. Molybdenum-containing 316 stainless steel is also 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, the choice of high-alloy stainless steel or fluorine plastic pump. Such as CQB magnetic pump, CQ stainless steel magnetic pump. 5. Alkali (sodium hydroxide) generally corrosive is not very strong, but the general alkaline solution will have a crystal, so the optional configuration of graphite 169 mechanical seal FSB-type fluoride alloy centrifugal pump 6. ammonia (ammonia hydroxide) Most Corrosion of metals and non-metals in liquid ammonia and aqueous ammonia (ammonia hydroxide) is minimal and only copper and copper alloys should not be used. Most of the company's products for ammonia and ammonia transport. Such as engineering plastic magnetic pump, FSB from the pump better 7. Saltwater (sea water) Ordinary steel in sodium chloride solution and seawater, salt water corrosion rate is not too high, the general need to use paint protection; all kinds of stainless steel also have very low uniform corrosion Rate, but may cause localized corrosion due to chloride ions, usually 316 stainless steel is better. Various types of chemical pumps have 316 material configuration 8. alcohols, ketones, esters, ethers common alcohol medium with methanol, ethanol, ethylene glycol, propanol, ketones, acetone, butanone, etc. , Ester medium has a variety of methyl ester, ethyl ester, ethers medium ether, ether, butyl ether, their corrosive is not strong, so can use ordinary stainless steel, the specific selection should be based on the properties of the media And related requirements to make a reasonable choice. It is also noteworthy that ketones, esters, ethers are soluble in a wide range of rubbers. There are many other media that can be used to avoid mistakes when selecting sealants. In short, the materials should not be arbitrarily and blindly selected. Related information or learn from the mature experience. Further reading: Motor IFAT China's top ten brands Guangzhou Exhibition building water pump manufacturers ranking ptc Show article belongs to Internet industry (Xiamen) Co., Ltd. All are welcome to reprint, please indicate the source and author of: Asian pumps Network Editor : Lindj (QQ / WeChat:) Starting: http://beng.liuti.cn/ (Service Hotline:)
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