304 stainless steel capillary is not easy to rust, and the composition of stainless steel has a greater relationship. In addition to iron, the composition of stainless steel also includes chromium, nickel, aluminum, silicon, etc. The chromium content of ordinary stainless steel is usually not less than 12%, even as high as 18%. After adding chromium and other elements to steel, the properties of steel can be changed.

For example,The molecular structure of the 304 stainless steel capillary is more uniform, and it is easier to form a dense oxide protective film on the surface of the steel, thereby greatly improving the corrosion resistance of stainless steel. Therefore, the 304 stainless steel capillary can resist the corrosion of fire, water, acid, alkali and various solutions, and will not rust. Scientists have found that the more uniform the internal structure of steel, the closer the connection between the various components, and the more difficult it is for corrosive agents to invade. In addition, the oxide protective film adheres to the surface and does not rust easily.

So why sometimes304 stainless steel capillaries rust? In fact, this is a misunderstanding of the lack of understanding of 304 stainless steel capillaries. It also rusts in some cases.

304 stainless steel capillary has the ability to resist atmospheric oxidation, that is, it does not rust, and it also has the ability to corrode in acid, alkali and salt-containing media, that is, corrosion resistance. However, the size of its corrosion resistance varies with the chemical composition of the steel itself, the state of mutual addition, the conditions of use and the type of environmental medium. 304 steel pipes have excellent anti-corrosion properties in a dry and clean environment, but when they are moved to coastal areas, they will rust in the sea fog due to the large amount of salt. Therefore, it is not stainless steel that will not rust in any environment.

304 stainless steel capillaries rely on a thin and strong, dense and stable chromium-rich oxide film formed on their surface to prevent oxygen atoms from continuing to penetrate and continue to oxidize, thereby obtaining corrosion resistance. Once for some reason, the film is continuously destroyed, the oxygen atoms in the air or liquid will continue to penetrate, or the iron atoms in the metal will continue to separate out to form loose iron oxide, then the 304 stainless steel capillary will rust. There are many forms of damage to this surface film, and it is also common in daily life.