Electrochemical corrosion corrodes metals in various forms, which not only acts between two metals, but also produces potential differences due to the poor solubility of the solution, the poor solubility of oxygen, and the slight difference in the internal structure of the metal, which aggravates the corrosion. Some metals themselves are not corrosion-resistant, but after it is corroded, it can produce a very good protective film, that is, a passivation film, which can prevent the corrosion of the medium. It can be seen that to achieve the purpose of anti-corrosion of metal valves, one is to eliminate electrochemical corrosion; Second, when electrochemical corrosion cannot be eliminated; To be able to produce a passivation film on the metal surface; The third is to select non-metallic materials without electrochemical corrosion instead of metal materials. Several antiseptic methods are described below.

1. Select corrosion resistant materials according to the medium

2. Using non-metallic materials

3. Painting

4. Add corrosion inhibitor

5. Electrochemical protection

6. Metal surface treatment

7. Thermal spraying

8. Control of corrosive environments

9. Improve processing technology and valve structure