1. The surface of stainless steel adheres to the organic juice (such as melon, vegetable, noodle soup, sputum, etc.), which forms organic acid in the presence of water and oxygen, and the organic acid will corrode the metal surface for a long time.

2. In polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide, and nitrogen oxide), it will form sulfuric acid, nitric acid, and acetic acid liquid spots in contact with condensed water, causing chemical corrosion.

3. The surface of stainless steel has accumulated dust containing other metal elements or attachments of foreign metal particles. In humid air, the condensed water between the attachments and stainless steel connects the two into a micro battery, which initiates an electrochemical reaction. , The protective film is damaged, which is called electrochemical corrosion.

4. The surface of stainless steel adheres to acid, alkali, and salt substances (such as alkaline water and lime water splashing on the decoration wall), causing local corrosion.