Stainless steel hinges will also rust? This problem is believed that many friends will not believe that everyone will feel that "stainless steel is not rust, rust is not stainless steel, steel may be a problem." In fact, the stainless steel hinge is formed on its surface by a very thin and 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. However, if for some reason the film is continuously destroyed, oxygen atoms in the air or liquid will continuously infiltrate or the iron atoms in the metal will continue to separate out, forming loose iron oxides, and the metal surface will be continuously rusted. Common situations in daily life can be divided into the following types:
1. The surface of the stainless steel hinge is affixed with acids, alkalis, and salts (such as alkali water and lime water splashing on the wall), causing localized corrosion.
2. The surface of the stainless steel hinge adheres organic juice (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. In contaminated air (such as an atmosphere containing a large amount of sulfides, carbon oxides, and nitrogen oxides), condensation occurs, and sulfuric acid, nitric acid, and acetic acid liquids are formed, causing chemical corrosion.
4. On the surface of the stainless steel hinge, deposits of dust or other metal particles containing other metal elements accumulate on the surface. In moist air, condensation water between the deposits and the stainless steel is connected into a micro battery, causing electrochemistry. Reaction, the protective film is destroyed, known as electrochemical corrosion.
Pinghu Tendency Hardware Co., Ltd
Add: No.158, Suijian Road, Suilun Industry Park,Pinghu City, Zhejiang Province, CHINA