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When the stainless steel surface appears brown rust (points), people great surprise: that "Stainless steel will not rust, rust is not stainless steel, the steel may be a problem." In fact, this is a lack of understanding of the stainless steel one-sided view of the error. Under certain conditions, the stainless steel will rust.

Stainless steel has the ability to resist the atmospheric oxidation of a stainless steel that is, while also having the ability to corrosion in acid, alkali, salt corrosion medium that.

But its size is corrosion resistance of steel itself with its chemical composition, mutual status, conditions of use and environmental media type change. Materials such as 304, in a clean dry atmosphere is absolutely excellent corrosion resistance, but move it to the waterfront area in the sea mist contains a lot of salt, will soon rust. Therefore, not any kind of stainless steel, corrosion resistant at all times, not rusty.

Stainless steel is a very thin layer formed on the surface by its fine and robust stabilized chromium-rich oxide film (pellicle), to prevent the infiltration of oxygen atom continues, continuing

Obtained by oxidation of the corrosion resistance. Once there is some reason, such a film being continuously damaged, air or liquid and will continue to infiltrate oxygen atom or a metal atom of iron was isolated out continuously, to form a loose iron oxide, the metal surface will be constant rust.

This takes many forms damaged surface film, everyday common are the following categories:

A stainless steel surface deposit savings contain dust or other metallic elements heterogeneous metal granule attachments, in the humid air, condensate and stainless steel fixtures between the two together into a micro-cell, causing the electro chemical reaction protective film is damaged, call it that electro chemical corrosion.

2, stainless steel surface adhesion of organic matter juice (such as vegetables, soup sputum, etc.), in the case of water oxygen to form organic acids, organic acids long is the formation of corrosion of metal surfaces.

3, stainless steel surface adhesion containing acid, alkali, salts (such as wall decoration alkaline, lime spray test) cause localized corrosion.

4, the polluted air (containing large amounts of sulfide, oxide, hydrogen peroxide atmosphere), the case of the condensate, to form sulfuric acid, nitric acid, acetic acid solution point, causing chemical corrosion. Above may damage the stainless steel surface protection film, causing corrosion. Therefore, in order to ensure a permanent bright metal surface, not rusty, we recommend:

① must often decorative stainless steel surface cleaning scrub, remove the attachments, eliminate corrosion caused by external factors.

② now have a 201 and 202 stainless steel materials in the coastal areas prone to rust on the market, suitable for use in the absence of industrial air pollution and corrosive environments.

③ waterfront areas should use 304 stainless steel, 304 resistant to seawater corrosion.

(Refer from Foshan Ocean stainless steel CO.,LTD-http://www.fsoceansteel.com/)