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Does stainlesssteel rust?
2017-03-22 00:00

Does stainlesssteel rust?

When thestainless steel surface appears brown rust (point) when people were surprised:that "stainless steel is not rusty, rust is not stainless steel, and maybe a steel problem." Infact, this is a lack of understanding of stainless steel a one-sided errorview. Stainlesssteel under certain conditions will be rusty.

Stainlesssteel has the ability to resist atmospheric oxidation --- that is, stainlesssteel, but also in the acid, alkali, salt medium is the ability to corrosion -that is, corrosion resistance. But its corrosionresistance is the size of its steel chemical composition, processing status,conditions of use and environmental media type and change. Suchas 304 stainless steel, in the dry and clean atmosphere, there is absolutelyexcellent anti-corrosion ability, but it moved to the beach area, with a largeamount of salt in the sea fog, will soon rust; and 316 stainless steelperformance good. Therefore, not anykind of stainless steel, in any environment can be resistant to corrosion, norust.

Stainlesssteel is the surface of the formation of a thin layer of thin and strong andstable stable chromium oxide film (protective film), to prevent the continuedinfiltration of oxygen atoms, continue to oxidize, and get the ability toresist corrosion. Oncefor some reason, the film has been constantly destroyed, the air or liquidoxygen atoms will continue to infiltrate or metal iron atoms continue toprecipitate out to form loose iron oxide, metal surface will continue to rust. This surface film isdamaged in the form of many, more common in daily life are the following:

stainlesssteel surface containing other metal elements containing dust or heterogeneousmetal particles attached to the moisture in the air, between the attachment andthe condensation between stainless steel, the two together into a micro-battery, triggering the electrochemicalreaction, Protective film is damaged,called electrochemical corrosion. For example, after therenovation of the new house, the water pipe there is metal debris, deposited inthe sink surface is very easy to cause rust.
stainless steel surface adhesion of organic juice(such as melons, soup, sputum, etc.), in the case of water and oxygen,constitute organic acids, long time the organic acid will produce corrosion onthe metal surface.
stainlesssteel surface adhesion containingacid, alkali, salt substances (such as decorative walls of alkaline water, limewater splash), causing local corrosion. More typical is thedecoration, the workers use the sink, there is no timely cleaning of the sink,causing acid and alkali material corrosion surface.
incontaminated air (such as containing a lot of sulfide, carbon oxides, nitrogenoxide atmosphere), in case of condensate, the formation of sulfuric acid,nitric acid, acetic acid liquid point, causing chemical corrosion.

The above can cause damage tothe surface of the stainless steel protective film caused by corrosion. So, to ensure that themetal surface is permanently bright and not corroded, we recommend:

1,must always clean the surface of stainless steel scrub, remove attachments, toeliminate the external factors that cause corrosion.

2,the market some of the chemical composition of stainless steel can not meet thecorresponding national standards, it will also cause rust, which requires usersto seriously choose a reputable manufacturers of products.