Stainless steel wire screen under what situation will rust?
stainless steel wire screen is formed on the surface of a thin, strong and stable chromium-rich oxide film (protective film), to prevent the continued penetration of oxygen atoms, continue to oxidize, and get the ability to resist corrosion.Once for some reason, the film is continuously destroyed, air or liquid oxygen atoms will continue to infiltrate or the iron atoms in the metal will continue to separate out to form loose iron oxides, and the metal surface will be continuously rusted. This type of surface film is subject to destruction in many forms, and is commonly seen in daily life as follows:
1. The stainless steel wire screen surface contains deposits of dust or other dissimilar metal particles containing other metal elements. In humid air, the condensate between the deposit and the stainless steel wire screen is connected into a micro battery to initiate the electrochemical reaction. The protective film is damaged, which is called electrochemical corrosion.
2. The surface of stainless steel wire screen adheres to organic matter juices (such as vegetables, noodles, soups, etc.). In the presence of water and oxygen, organic acids are formed, and organic acids attack metal surfaces for a long time.
3. The surface of the stainless steel wire screen adheres to acids, alkalis, and salts (such as alkaline water and lime water splashing on the wall), causing localized corrosion.
4. In contaminated air (such as an atmosphere containing a large amount of sulfides, carbon oxides, and nitrogen oxides), condensed water is formed and sulfuric acid, nitric acid, and acetic acid liquids are formed, causing chemical corrosion.
The above conditions can cause the destruction of the stainless steel wire screen surface protective film to cause corrosion. Therefore, in order to ensure that the metal surface is permanently bright and not rusted, we must perform cleaning, passivation and other treatments on the surface.
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