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Stainless steel

2017-11-10 10:31 by qunkun
Stainless steel is a great invention in the steel industry. Stainless steel products have also been popularized to various households. Their corrosion resistance has won the favor of consumers. Especially after 80 and 90, they are even more addicted to it. Recently, some customers said the use of stainless steel wire mesh products appear rusty, so people suspect that there is a problem with stainless steel, is a fake and shoddy products. In fact, stainless steel is not not rust, and corrosion resistance is relatively stronger, so in fact the use of stainless steel mesh or need some maintenance and repair. So even though a small part is a poor quality product, most of them are still acceptable, but people lack a good understanding of stainless steel.

Stainless steel is a kind of iron as the main raw material of the alloy, its corrosion resistance mainly comes from the alloy of chromium. The chromium element forms a very thin, solid, dense, chromium-rich oxide film (protective film) on the stainless steel surface that successfully blocks the infiltration of oxygen molecules and thus provides stainless steel with corrosion resistance. However, if this film continues to be damaged, the oxygen in the air or liquid will continuously infiltrate or the iron atoms in the metal are continuously exposed to form loose iron oxide, and the metal surface will continue to be eroded. There are many forms of destruction of stainless steel surface film, common in everyday life there are several:

1. Stainless steel surface with deposits of other metal elements containing dust or heterogeneous metal particles attached to the humid air, the condensate between the attachment and stainless steel, the two connected into a micro-cell, triggering the electrochemical reaction , The protective film is damaged, called electrochemical corrosion.
2. Stainless steel surface adhesion of organic juice (such as vegetables, noodles soup, sputum, etc.), in the presence of water and oxygen, the formation of organic acids, organic acids for a long time on the metal surface corrosion.
3. Stainless steel surface adhesion contains acid, alkali, salts (such as the renovation of the wall of alkali water, lime splashing), causing local corrosion.
4. In polluted air (such as a large amount of sulfide, carbon dioxide, nitrogen oxides in the atmosphere), the case of condensate, the formation of sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion.

All of the above conditions can cause the destruction of the protective film on the surface of the stainless steel to cause corrosion. Therefore, the stainless steel is not completely rust-free. To keep the metal surface permanently bright, it must be cleaned, passivated and so on. Therefore, if the majority of customers using stainless steel wire mesh products or to be slightly concerned about the use of the environment and the use of such stainless steel mesh will be able to long-term use.

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