Corrosion is one of the hazards of chemical equipment headaches. A slight carelessness can damage the equipment, or cause an accident or even a disaster. According to relevant statistics, about 60% of the damage of chemical equipment is caused by corrosion. Therefore, the scientific nature of the material selection should be paid attention to when selecting the chemical valve.
Key points of material selection:
1. Sulfuric acid is an important industrial raw material with a very wide range of uses. Sulfuric acid of different concentrations and temperatures has great differences in the corrosion of materials. Carbon steel and cast iron have better corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid and is not suitable for use. The material of the pump valve. Therefore, pump valves for sulphuric acid are usually made of high-silicon cast iron and high-alloy stainless steel.
2. Most metal materials are not resistant to hydrochloric acid corrosion. Contrary to metal materials, most non-metal materials have good corrosion resistance to hydrochloric acid. Therefore, rubber valves and plastic valves lined with hydrochloric acid are the best choices for transporting hydrochloric acid.
3. Nitric acid, most metals are rapidly corroded and destroyed in nitric acid. Stainless steel is the most widely used nitric acid resistant material. It has good corrosion resistance to all concentrations of nitric acid at room temperature. For high temperature nitric acid, titanium and titanium are usually used. Alloy materials.
4. Acetic acid is one of the most corrosive substances in organic acids. Ordinary steel will be severely corroded in acetic acid at all concentrations and temperatures. Stainless steel is an excellent acetic acid resistant material, which is harsh for high temperature and high concentration acetic acid or other corrosive media. When required, high-alloy stainless steel valves or fluoroplastic valves can be selected.
Post time: Nov-27-2021