1. The surface of the cabinet will be attached to many pollutants, including dust and oil, which will undergo chemical changes with acid, alkali and salt, and then transform into corrosive medium. The stainless steel parts cabinet will rust in contact with carbon steel parts, leading to electrochemical corrosion due to corrosive medium.
2. The scratch caused by the contact between the cabinet and the carbon steel parts and the scratch caused by the passivation film reduce the protection ability of the stainless steel, and react with the chemical medium, causing chemical corrosion and rust. In addition, when cutting, easy to rust media will adhere to the corrosive street, and electrochemical corrosion will occur.
3. After welding, there are many defects in many parts, including chemical defects, such as coarse crystal, segregation, and physical defects, such as crack penetration and bite edge.
4. When cleaning, if pickling passivation is not cleaned, and residual liquid remains on the cabinet, it will also cause corrosion of stainless steel parts, which is a kind of chemical corrosion.