Valve corrosion speed can be divided into six

Valve corrosion speed can be divided into six :

1. Full corrosion resistance: corrosion speed is lower than 0.001 mm/year

2. Extreme corrosion resistance: corrosion speed 0.001 to 0.01 mm/year;

3. Corrosion resistance: corrosion speed from 0.01 to 0.1 mm/year

4. Corrosion resistance: corrosion rate from 0.1 to 1.0 mm/year

5. Poor corrosion resistance: corrosion speed from 1.0 to 10 mm/year;

6. Corrosion resistance: corrosion speed is greater than 10 mm/year