Causes of damage to the protective film on the surface of the stainless steel plate

Causes of the destruction of the protective film on the surface of the stainless steel sheet 1. There are dusts containing other metal elements or attachments of dissimilar metal particles on the surface of the stainless steel. In the humid air, the condensation water between the attachments and the stainless steel will cause the The battery is connected into a micro-battery, which triggers an electrochemical reaction, and the protective film is damaged, which is called electrochemical corrosion. 2. Organic juices (such as vegetables, noodle soup, sputum, etc.) adhere to the surface of stainless steel. In the presence of water and oxygen, organic acids are formed, and organic acids will corrode the metal surface for a long time. 3. The surface of stainless steel adheres to substances containing acids, alkalis and salts (such as alkali water and lime water splashing from decoration walls), causing local corrosion. 4. In the polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide, nitrogen oxide), when encountering condensed water, it will form sulfuric acid, nitric acid, and acetic acid liquid spots, causing chemical corrosion. The above conditions can cause damage to the protective film on the stainless steel surface and cause rust.

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