1. The surface of stainless steel accumulates dust containing other metal elements or attachments of dissimilar metal particles. In humid air, the condensed water between the attachments and stainless steel connects the two to form a micro battery, which initiates an electrochemical reaction. , The protective film is damaged, which is called electrochemical corrosion.
2. Organic juice (such as melon, vegetable, noodle soup, sputum, etc.) adheres to the surface of stainless steel. In the presence of water and oxygen, it forms organic acid, which will corrode the metal surface for a long time.
3. The surface of stainless steel adheres to acid, alkali, and salt substances (such as alkali water and lime water spray test on the decoration wall) to cause local corrosion.
4. In polluted air (atmosphere containing a lot of sulfides, oxides, and hydrogen oxides), contact with condensed water will form sulfuric acid, nitric acid, and acetic acid liquid spots, causing chemical corrosion.