When the stainless steel tube surface appear brown rust (point) when people are surprised: "the stainless steel does not rust, rust is stainless steel, steel may be a problem". Actually, this is a one-sided view of the error of the lack of understanding of stainless steel. Stainless steel will rust under certain conditions.
Stainless steel has the ability to resist atmospheric oxidation - that is, stainless steel, and also has the ability to corrode in the medium containing acids, alkalis and salts - that is, corrosion resistance. But its corrosion resistance is the size of steel with its own chemical composition, increase mutual status, conditions of use and environmental changes in the type of media. Such as the 304 steel pipe, in the dry clean atmosphere, have absolutely excellent anti-corrosion ability, but it will be moved to the beach area, with large amounts of sea salt fog, will rust quickly; and the good performance of 316 steel pipe. Therefore, not any kind of stainless steel, can in any environment corrosion, no rust.
Stainless steel is a very thin layer formed on the surface and the stability of the fine solid chromium rich oxide film (protective film), to prevent the infiltration of oxygen atoms, to oxidation, and the ability to obtain anti-corrosion. Once there are some reasons, this film was constantly destroyed, air or liquid oxygen in the original will continue to infiltrate or metal atoms of iron to keep out from the loose formation of iron oxide, gold is also surface by constantly corrosion. Many of the surface damage in the form of daily living in see are as follows:
1. stainless steel surface deposited dust or heterogeneous metal particles containing other metal elements of the attachment, in the humid air, condensed water and adhesion between the stainless steel, the two together into a micro battery, causing the electrochemical reaction, the film has been destroyed, called electro chemical corrosion.
2. stainless steel surface adhesion of organic juice (such as vegetables, soup, sputum), oxygen in the water under the circumstances, a long time, organic acid, organic acid on the surface of metal corrosion.
3. stainless steel surface adhesion contains acid, alkali, salt substances (such as decoration wall caustic soda, lime water splash), causing local corrosion.
4. in the polluted air (such as a large amount of sulfide, carbon monoxide, nitrogen oxides in the atmosphere), when the condensation water is formed, sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion.
The above conditions can cause damage to the stainless steel surface protection film and lead to corrosion. So, in order to make sure that the metal surface is permanently bright and not corroded, we recommend that the metal surface be permanently polished:
1., it is necessary to clean the surface of decorative stainless steel, remove attachments, and eliminate the external factors that cause modification.
2. coastal area to use 316 stainless steel, 316 material can resist seawater corrosion.
3. some stainless steel tubes in the market can not meet the corresponding national standards, and can not meet the requirements of 304 material. It can also cause rust
Enterprise public no
