Stainless steel wire mesh is also rusty
Why does stainless steel rust? Under normal circumstances, stainless steel will not rust. However, if the environment is improperly used or maintained, or the environment in which the stainless steel is located is too harsh, the stainless steel may be rusted.
The stainless steel wire mesh is a very thin and strong and stable chromium-rich oxide film (protective film) formed on the surface to prevent the oxygen atoms from continuing to infiltrate and continue to oxidize, thereby obtaining the ability to resist rust. Once for some reason, the film is continually destroyed, oxygen atoms in the air or liquid will continue to infiltrate or iron atoms in the metal will continue to separate out, forming loose iron oxide, and the metal surface will be continuously rusted.
There are many forms of such surface film damage, and the following are common in daily life:
1. The surface of the stainless steel screen contains dust or other metal particles attached to other metal elements. In the humid air, the condensed water between the attached material and the stainless steel connects the two into a micro battery, causing electricity. In the chemical reaction, the protective film is destroyed, which is called electrochemical corrosion.
2. The surface of the stainless steel mesh adheres to the organic juice (such as melon, noodle soup, glutinous rice, etc.), and in the case of water and oxygen, it constitutes an organic acid, and the organic acid corrodes the metal surface for a long time.
3. The surface of the stainless steel mesh adheres to acid, alkali and salt substances (such as alkali water and stone water splashing on the wall), causing local corrosion.
4. In polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide, nitrogen oxide), in the case of condensed water, sulfuric acid, nitric acid, acetic acid liquid point is formed, causing chemical corrosion.
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