Corrosion has always been one of the most headaches of chemical pump equipment. If it is slightly inadvertent, it will damage the equipment, and it will cause accidents and even cause disasters. According to the statistics, about 60% of the damage of chemical pump equipment is caused by corrosion. In the selection of chemical pumps, we must first pay attention to the scientific nature of material selection. Corrosion has always been one of the most headaches of chemical pump equipment. If it is slightly inadvertent, it will damage the equipment, and it will cause accidents and even cause disasters. According to the statistics, chemical pump About 60% of equipment damage is caused by corrosion. Therefore, in the selection of chemical pumps, we must first pay attention to the scientific nature of material selection. There is usually a misunderstanding that stainless steel "target=_blank> stainless steel is a "universal material", no matter what medium and The environmental conditions are all stainless steel "target=_blank> stainless steel pump This is very dangerous. Here are some points for the selection of some common chemical pump media:
1. Sulfuric acid as one of the strong corrosive media is an important industrial raw material with a wide range of uses. The sulfuric acid of different concentrations and temperatures has a great difference in corrosion of materials. For concentrated sulfuric acid and carbon steel with a concentration above 80% and a temperature less than 80 °C. Cast iron has good corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid, not suitable for pump valve materials; ordinary stainless steel "target=_blank> stainless steel such as 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti) is also limited in use of sulfuric acid medium Therefore, the pump valve for conveying sulfuric acid is usually made of high-silicon cast iron (difficult to cast and process) and high-alloy stainless steel "target=_blank> stainless steel (20 alloy). Fluoroplastics have better sulfuric acid resistance and are lined with fluorine pump ( F46) is a more economical choice. The company's products include fluorine plastic chemical centrifugal pump, FP FS series plastic corrosion-resistant pump, CQB-F type fluorine plastic magnetic drive pump.
2, hydrochloric acid, most of the metal materials are not resistant to hydrochloric acid corrosion (including various stainless steel) "target=_blank> stainless steel material) molybdenum high silicon iron can also be used only 50 ° C, 30% hydrochloric acid. The opposite of metal materials Non-metallic materials have good corrosion resistance to hydrochloric acid, so rubber pumps and plastic pumps (such as polypropylene, fluoroplastics, etc.) are the best choice for transporting hydrochloric acid.
3. The general metal of nitric acid is mostly corroded and destroyed in nitric acid. Stainless steel "target=_blank> stainless steel is the most widely used nitric acid resistant material. It has good corrosion resistance to all concentrations of nitric acid at normal temperature. It is worth mentioning that it is included. Molybdenum stainless steel "target=_blank> stainless steel (such as 316, 316L) is not only better than ordinary stainless steel for corrosion resistance. "Target=_blank> stainless steel (such as 304, 321) is sometimes even worse. For high temperature nitric acid, titanium is usually used. And titanium alloy materials.
4. Acetic acid It is one of the most corrosive substances in organic acids. Ordinary steel will be seriously corroded in acetic acid of all concentrations and temperatures. Stainless steel "target=_blank> stainless steel is an excellent acetic acid resistant material, 316 stainless steel containing molybdenum. " target=_blank>Stainless steel can also be used for high temperature and dilute acetic acid vapor. For high temperature and high concentration of acetic acid or other corrosive media, high alloy stainless steel "target=_blank> stainless steel pump or fluoroplastic pump can be used.
5. Alkali (sodium hydroxide) steel is widely used in sodium hydroxide solution below 30 °C and 30% concentration. Many factories still use ordinary steel at 100 ° C and below 75%, although the corrosion is increased but the economy is good. Stainless steel "target=_blank> stainless steel has no obvious advantage to lye corrosion resistance compared with cast iron. As long as a small amount of iron is allowed in the medium, stainless steel "target=_blank> stainless steel is not recommended. For high-temperature lye, titanium and titanium are used. Alloy or high-alloy stainless steel "target=_blank> stainless steel. The company's general cast iron pump can be used for special requirements of low temperature alkaline liquid at room temperature. All kinds of stainless steel "target=_blank> stainless steel pump or fluoroplastic pump.
6. Ammonia (ammonium hydroxide) Most metals and non-metals are slightly corrosive in liquid ammonia and ammonia (ammonium hydroxide). Only copper and copper alloys should not be used. Most of the products are suitable for the transportation of ammonia and ammonia.
7. Salt water (seawater) ordinary steel in the sodium chloride solution and seawater, salt water corrosion rate is not too high generally need to use paint protection; all kinds of stainless steel "target=_blank> stainless steel also has a very low uniform corrosion rate but may be due to chloride ions The local corrosion is usually caused by 316 stainless steel "target=_blank> stainless steel. The company's various chemical pumps have 316 material configuration.
Article from: http://NewsDetail250T1.html China Hardware Business Network http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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