Stainless steel 304, 316 quick connector
点击数：7862016-03-22 11:03:55 来源: Hebei Naiwo Fluid Technology Co.,Ltd
Stainless steel depends mainly on chromium, nickel, if you can achieve a higher standard, this material will be better stainless steel.
Here are some of the reasons why stainless steel and rust.
Stainless steel is not easy to rust and stainless steel composition has a great relationship. In addition to the composition of stainless steel, iron, chromium, nickel, aluminum, silicon, etc.. General of the chromium containing stainless steel is generally not less than 12%, or even higher to 18%. Steel added elements such as chromium, can change the performance of the steel, such as the molecular structure of steel more uniform on the surface of the steel is more easily to form a layer of dense oxide protective film, thereby greatly improving the ability of corrosion-resistant stainless steel. Therefore, stainless steel can resist fire, water, acid, alkali and a variety of solutions to its corrosion, no rust. The scientists found that the internal structure of the steel is more uniform, various components more closely linked to the corrosion of the more difficult the invasion, also attached to the surface with a layer of oxide film, like iron and steel to wear armor, was not naturally easy to rust.
Why is stainless steel rust? 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". In fact, this is a one-sided understanding 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, rust, but also has the ability to corrosion in acid, alkali, salt medium - 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 atoms will continue to infiltrate or metal atoms of iron to keep out from the loose formation of iron oxide, the metal surface will be continuously corroded. This kind of surface film is destroyed in the form of a lot of daily life, there are several:
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 containing acid, alkali and salts (such as wall decoration, soda lime water splash), caused by local corrosion.
4 in the polluted air (such as containing a large number of sulfide, carbon monoxide, nitrogen oxides of the atmosphere), in case of condensation water, the formation of sulfuric acid, nitric acid, acetic acid solution, causing chemical corrosion.