1. Sulfuric acid:
As one of the strong corrosive medium, usually stainless steel, such as 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti) on the use of sulfuric acid medium is limited. So the delivery of sulfuric acid valve is usually high silicon cast iron (forging and machining difficult), high alloy stainless steel (alloy 20) production. Fluorine plastic has good resistance to sulfuric acid function, the use of fluorine pump (F46) is a more economical choice. Sulfuric acid is a very widely used industrial raw material. Not the same thing as corrosion of sulphuric acid concentration and temperature on the data quite different, a concentration above 80%, the temperature is less than 80 DEG C of concentrated sulfuric acid, carbon steel and cast iron has good corrosion resistance. But it is not suitable for high speed of sulfuric acid, valve does not apply;
2. Hydrochloric acid:
Most metal materials can't resist hydrochloric acid corrosion (contains a variety of stainless steel), containing high molybdenum ferrosilicon also can only be used to 50 DEG C, below 30% hydrochloric acid. Contrary to metal materials, the vast majority of non metal materials have good corrosion resistance to hydrochloric acid, so the lining of rubber pumps and plastic pumps (such as polypropylene, fluorine plastic, etc.) is the best choice for the delivery of hydrochloric acid.
3. Nitrate:
Usually most metal in nitric acid is agile damage or corrosion, stainless steel is used most widely resistance data of nitrate and the nitrate concentration under normal temperature have good corrosion resistance, it is worth mentioning is containing molybdenum stainless steel (such as 316316 L) of nitric acid corrosion resistance is not only no better than are usually made of stainless steel (eg 304321), and sometimes even better. On the high temperature nitric acid, usually titanium and titanium alloy materials.
4. Acetic acid:
It is one of the organic acids in the most corrosive substances, usually iron and steel in the acetic acid concentration and temperature will serious corrosion, stainless steel is an excellent acid resistant materials, 316 stainless steel containing molybdenum can also apply to high temperature and dilute acetic acid vapor. High alloy stainless steel or fluorine plastic pump can be used for high temperature and high concentration of acetic acid or other corrosive medium.
