Stainless steel has the ability to resist atmospheric oxidation, ie corrosion resistance. However, the degree of corrosion resistance varies with the chemical composition of the steel itself, the processing state, the conditions of use, and the type of environmental medium. For example, 304 steel has absolutely excellent rust resistance in a dry and clean atmosphere, but it is moved to the coastal area and rusts quickly in sea fog with a large amount of salt: 316 steel performs well. Therefore, it is not any kind of stainless steel that is resistant to corrosion and rust in any environment.
Stainless steel wire screen is a layer of extremely 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. For some reason, the film has been continuously destroyed. The oxygen atoms in the air or liquid will continue to infiltrate or the iron atoms in the metal will continuously precipitate ions, forming loose iron oxide, and the metal surface will be continuously corroded. .
There are many forms of such surface film damage, and the following are common in daily life:
(1) The surface of stainless steel contains deposits of dust or dissimilar metal particles containing other metal elements. In humid air, the condensed water between the attached material and the stainless steel connects the two into a micro-battery, which causes electro chemistry. The reaction, the protective film is destroyed, called electro chemical corrosion
(2) the surface of the stainless steel adheres to the organic juice (such as melon, noodle soup, glutinous rice, etc.), in the case of water and oxygen, constitutes an organic acid, and for a long time, the organic acid Corrosion of metal surfaces.
(3) The surface of stainless steel adheres to acid, alkali and salt substances (such as alkali water and lime water sprayed on the wall), causing local corrosion
(4) in polluted air (such as containing a large amount of sulfide carbon oxide) , the atmosphere of nitrogen oxides, in the case of condensed water, the formation of sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion.
All of the above can cause the corrosion of the stainless steel surface protective film to cause rust, so in order to ensure that the metal surface is long and bright,
We recommend the following points when dealing with stainless steel wire screen raw materials or stainless steel products:
1. The stainless steel surface must be cleaned and polished frequently to remove deposits and eliminate external factors that cause corrosion.
2. Use 316 for beaches
3. Some stainless steel chemical components on the market cannot conform to stainless steel, and 316 is resistant to seawater corrosion. Corresponding national standards do not meet the requirements of 304 material, so it will also cause rust.
This requires users to carefully select products from reputable manufacturers. MAISHI WIRE MESH MANUFACTURE GROUP has done stainless steel wire screen business for over 30 years, and we do honest business. Welcome to contact us!
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