According to relevant statistics, about 60% of chemical process pump damage is caused by corrosion, so in chemical process pump selection, we must first pay attention to the scientific material selection. There is often a misunderstanding that stainless steel is a "universal material," no matter what the media and environmental conditions are held stainless steel pump, which is very dangerous.
1) Sulfuric acid, one of the most corrosive media, is a very important industrial raw material for a wide range of uses. 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 Process pump, not suitable for chemical process pump material; ordinary stainless steel, such as 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti) sulfuric acid medium is also limited use.
Therefore, the delivery of sulfuric acid chemical process pump usually uses high silicon cast iron (casting and processing difficult), high alloy stainless steel (20 alloy) manufacturing. Fluorine plastic has better resistance to sulfuric acid, the fluorine-fluorine chemical process pump (F46) is a more economical choice.
2) Hydrochloric acid Most metal materials are not resistant to hydrochloric acid corrosion (including a variety of stainless steel materials), 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 chemical process pumps (such as polypropylene, fluoroplastic, etc.) are the best choice for the delivery of hydrochloric acid.
3) Nitric acid Most metals are mostly corroded in nitric acid, stainless steel is the most widely used nitric acid-resistant chemical process pump material, all concentrations of nitric acid at room temperature have good corrosion resistance, it is worth mentioning that the molybdenum Stainless steel (such as 316,316 L) nitric acid corrosion resistance is not only not superior to ordinary stainless steel (such as 304,321), sometimes even worse. For high-temperature nitric acid chemical process pump, usually titanium 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 all concentrations and temperatures of acetic acid. Stainless steel is an excellent acetic acid-resistant chemical process pump material. Molybdenum 316 stainless steel is also suitable At high temperature and dilute acetic acid steam. For high temperature and high concentration of acetic acid or other corrosive media and other harsh requirements, the choice of high-alloy stainless steel chemical process pump or fluorine plastic chemical process pump.
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