Does stainless steel rust?

So stainless steel is only to rust this phenomenon has the effect of preventing, but not completely prevent, stainless steel will rust under certain conditions. Stainless steel has the ability to resist atmospheric oxidation (that is, rust), but also has the ability to resist corrosion in the medium containing acid, alkali, salt (that is, corrosion resistance). However, its corrosion resistance varies with its chemical composition, mutual state, service conditions and environmental media types. Such as 304 steel pipe, in the dry and clean atmosphere, there is absolutely excellent corrosion resistance, but it will be moved to the coastal area, in the sea fog containing a lot of salt, will soon rust; And 316 steel pipe is good performance. Therefore, not any kind of stainless steel, in any environment can withstand corrosion, not rust. Stainless steel is formed by its surface of a layer of very thin and solid fine stable chromium oxide film (protective film), to prevent oxygen atoms continue to penetrate, continue to oxidize, and obtain the ability to resist corrosion. Once for some reason, this film is continuously damaged, oxygen in the air or liquid will continue to infiltrate or iron atoms in the metal is constantly removed, forming loose iron oxide, metal surface is also subjected to continuous corrosion. This surface film is damaged in many forms, common in daily life are as follows: 1, stainless steel surface deposited with dust or different metal particles containing other metal elements attachment, in the humid air, the condensate between the attachment and stainless steel, the two connected into a micro battery, triggered an electrochemical reaction, the protective film is damaged, called electrochemical corrosion; 2, stainless steel surface adhesion organic juice (such as melon and vegetables, soup, sputum, etc.), in the case of water and oxygen, organic acid, organic acid corrosion on the metal surface for a long time; 3, stainless steel surface adhesion contains acid, alkali, salt substances (such as decoration of the wall of alkali water, stone ash water splash), cause local corrosion; 4, in the polluted air (such as containing a large number of sulfide, carbon oxide, nitrogen oxide atmosphere), encounter condensed water, the formation of sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion. The above situation can cause the damage of stainless steel surface protective film to cause corrosion. Therefore, in order to ensure that the metal surface is permanently bright and not corroded, we suggest: 1, we must often clean the surface of decorative stainless steel, remove attachments, eliminate external factors causing modification; 2, the seaside area to use 316 stainless steel, 316 material can resist seawater corrosion; 3, some stainless steel tube chemical composition on the market can not meet the corresponding national standards, can not meet the requirements of 304 material. Therefore, it will also cause rust, which requires users to carefully choose the products of reputable manufacturers.

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