Vacuum pump is widely used in chemical industry

As for the vacuum pump in the chemical industry, for its sulfuric acid, it is also an important industrial raw material with a wide range of uses. In terms of different concentrations and temperatures of sulfuric acid, the corrosion of vacuum pump materials is poor. In terms of its concentration, it will be more than 80%. In terms of its temperature, it will be less than 80 ℃.

Carbon steel and cast iron vacuum pumps actually have better corrosion resistance. In this respect, they are not suitable for high-speed flow of sulfuric acid, In this respect, it is not suitable for pump valve materials. Because of this, the pump valve conveying sulfuric acid is generally made of high silicon cast iron and its high alloy stainless steel (No. 20 alloy).

The acetic acid in the vacuum pump is actually one of the more corrosive substances in the organic acid. In terms of ordinary steel, in terms of all concentrations and temperatures of acetic acid, it will have a serious corrosion. In addition, in terms of stainless steel, it is actually a relatively excellent acetic acid resistant material, which will be in the 316 stainless steel containing molybdenum Rust steel is actually suitable for high temperature and dilute acetic acid steam.

When hydrochloric acid is contained in the medium of vacuum pump, for most metal materials, it is not resistant to hydrochloric acid corrosion. Moreover, for its molybdenum containing high silicon iron, it is only used for hydrochloric acid below 50 ℃ and 30%.

As far as the medium of vacuum pump is concerned, it actually has the opposite phenomenon with metal materials. As far as most non-metal materials are concerned, they have good corrosion resistance to hydrochloric acid. Because of this, the lining rubber pump and plastic pump (such as polypropylene, fluoroplastics, etc.) of vacuum pump are actually a good choice for conveying hydrochloric acid.