1. The experimental results show that the higher the content of molybdenum or manganese, the stronger the ability to resist pitting corrosion;

2. Control the pH, chloride concentration and temperature of the liquid in contact with stainless steel;

3. Cathodic and anodic protection. Take these two protective measures at the same time;

4. Try to use stainless steel of better quality, such as 316 or 316L.