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Resistance to high temperature corrosion resistant pump medium feature selection

by:J&T     2020-07-24
Characteristics of the high-temperature corrosion-resistant pump medium selection: according to different medium, need to choose different resistance to high temperature corrosion resistant pump model.

1, acid media as one of strong corrosive medium, sulfuric acid is an important industrial raw material is very versatile. Corrosion of different concentration and temperature of sulfuric acid on the material difference is bigger, the concentration is above 80%, the temperature is less than 80 ℃ concentrated sulfuric acid, carbon steel and cast iron has good corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid, is not used as a water pump valve materials; Ordinary stainless steel such as 304 ( 0Cr18Ni9) , 316 ( 0Cr18Ni12Mo2Ti) Also limited use in sulfuric acid medium. So transport of sulfuric acid pump valve usually use high silicon cast iron ( Casting and machining is difficult) , high alloy stainless steel, 20 alloy) Manufacturing, but the processing difficulty and expensive, so don't be valued by people. Fluoroplastic alloy has very good acid resistance, it is the patent of Chinese Academy of Sciences, Shanghai institute of organic chemistry, materials, my company in 1985 the introduction of patented technology, with its earliest development and production of anti-corrosion chemical pumps, the Chinese Academy of Sciences experiments prove that has yet to have a kind of chemical medium and can respond, so the lining fluoride pump ( F46) Is a kind of more economical choice.

2, hydrochloric acid medium most don't hydrochloric acid corrosion resistant metal materials ( Including all kinds of stainless steel materials) , also can only be used for high molybdenum ferrosilicon 50 ℃ and below 30% hydrochloric acid. And metal materials contrary, the vast majority of non-metallic materials of hydrochloric acid have good corrosion resistance, so the lining rubber and plastic pump ( Such as engineering plastics, fluorine plastic, etc. ) Is the best choice of transportation hydrochloride. 3, nitric acid

general metal corrosion and damage, mostly in nitric acid was quickly stainless steel corrosion resistant centrifugal pump is the most widely used nitric acid resistance of the centrifugal pump, the room temperature all the concentration of nitric acid have good corrosion resistance, it is worth mentioning the molybdenum stainless steel ( Such as 316, 316 l) For nitric acid corrosion resistance not only no better than ordinary stainless steel ( Such as 304, 321) And sometimes not. For the high-temperature nitric acid, usually with fluoroplastic alloy materials.

4.

it is organic acid in the acetic acid corrosive one of the strongest material, ordinary steel in all concentration and temperature of severe corrosion of acetic acid, acetic acid proof material is stainless steel, 316 stainless steel containing molybdenum can also apply to high temperature and dilute acetic acid steam. For high temperature and high concentration of acetic acid or contain other corrosive medium such as strict requirements, can choose high alloy stainless steel or fluorine plastic chemical pump such as CQB magnetic pump type stainless steel magnetic pump, CQ magnetic drive pump, stainless steel pipeline centrifugal pump, stainless steel chemical pump.

5, alkali ( Sodium hydroxide) General corrosion resistance is not strong, but generally alkali solution can produce crystallization.

6, ammonia ( Ammonia hydroxide) Most metals and non-metallic liquid ammonia and ammonia ( Ammonia hydroxide) The corrosion is very slight, only copper and copper alloy should not be used.


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