Analysis of corrosion reasons for stainless steel plates 1 Dust containing other metal elements or attachments of dissimilar metal particles accumulate on the surface of stainless steel. In humid air, the attachment and the condensate between the attachment and stainless steel form a micro battery, triggering an electrochemical reaction and damaging the protective film, which is called electrochemical corrosion. 2. The surface of stainless steel adheres to organic juices (such as melons, vegetables, noodle soup, phlegm, etc.), which form organic acids in the presence of water and oxygen. Over time, organic acids corrode the metal surface. 3. The surface of stainless steel adheres to substances containing acids, alkalis, and salts (such as alkaline water and lime water splashing during wall decoration), causing local corrosion. 4. In polluted air (such as atmospheres containing large amounts of sulfides, carbon oxides, and nitrogen oxides), when encountering condensed water, sulfuric acid, nitric acid, and acetic acid droplets form, causing chemical corrosion. The above situations can cause damage to the protective film on the surface of stainless steel, leading to corrosion.