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    Stainless steel quick coupling difference bettwen 304 and 316

    2019-03-28 15:26:54 Aike Hydraulic Quick Coupling Read

    Stainless steel quick coupling difference bettwen 304 and 316 


    Why does stainless steel quick coupling rust? When the stainless steel tube surface appears brown rust spot (point), people feel surprised: think that "stainless steel is not rusty, rust is not real stainless steel, may be steel problems". In fact, this is a one-sided view of the lack of understanding of stainless steel. Stainless steel connector will rust under certain conditions. Stainless steel has the ability to resist atmospheric oxidation, that is, rust, but also in the medium containing acid, alkali, salt is the ability of corrosion resistance, that is. However, the corrosion resistance of steel varies with its chemical composition, additive state, service condition and medium type. Such as 304 steel pipe, in the dry and clean atmosphere, has absolutely excellent corrosion resistance, but it will be moved to the coastal areas, containing a large amount of salt in the sea fog, will soon rust;  While the 316 steel pipe performed well. Therefore, not every stainless steel can resist corrosion in any case, and won't rust. surface to form a very thin and solid thin stable rich chromium oxide film (protective film), prevent oxygen atoms continue to infiltrate, oxidation, and obtain the ability to resist corrosion. If, for some reason, the film is subjected to continuous corrosion, the oxygen particles in the air or liquid will continuously infiltrate or the iron atoms in the metal will continuously separate out to form loose iron oxide, and the surface of the metal will be constantly rusted. There're a lot of forms for this kind of surface film is, The mostly we see in our daily life as the followings: 

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    (1) The deposited on the surface of the stainless steel contain other metals attached or heterogeneous metal particles of dust of the content, in the humid air, attachments and stainless steel, the condensed water between them will link them together as a micro battery, triggers the electrochemical reaction, membran, that is so called the electrochemical corrosion. 


    (2). Stainless steel surface adhesion organic juice (such as melon and vegetable, noodle soup, phlegm, etc.), in the case of water oxygen, constitute organic acid, organic acid and it'll corrosion on the metal surface for a long time.


    (3). The stainless steel surface adhesion contains acid, alkali, salt substances (such as decoration of the wall of alkaline water, stone ash water spray), causing local corrosion. 


    (4). In the polluted air (such as the atmosphere containing a large number of sulfides, carbon oxides and nitrogen oxides), the condensation water will form sulfuric acid, nitric acid and acetic acid solution points, causing chemical corrosion.


    Stainless steel quick coupling is not easy to rust and stainless steel components have a great relationship. The composition of stainless steel in addition to iron, there are chromium, nickel, aluminum, silicon and so on. The average stainless steel contains no less than 12% chromium, and even 18% chromium. When chromium and other elements are added to the steel, the properties of the steel can be changed. For example, the structure of the steel is more uniform, and a layer of Stainless steel is not easy to rust and stainless steel components have a great relationship. The composition of stainless steel in addition to iron, there are chromium, nickel, aluminum, silicon and so on. The average stainless steel contains no less than 12% chromium, and even 18% chromium. When chromium and other elements are added to the steel, the properties of the steel can be changed. For example, the structure of the steel is more uniform, and a layer of dense oxide film is more easily generated on the surface of the steel, thus greatly improving the corrosion resistance of the stainless steel. So stainless steel can resist fire, water, acid, alkali and various solutions to its corrosion, not rust. Scientists have found that the more uniform the internal structure of steel, the more closely the various components are connected and the more difficult it is for corrosion to invade. In addition, a layer of oxide film is attached to the surface, just like armor for steel, so it is not easy to rust. oxide film is more easily generated on the surface of the steel, thus greatly improving the corrosion resistance of the stainless steel.

    So stainless steel quick coupling can resist fire, water, acid, alkali and various solutions to its corrosion, not rust. Scientists have found that the more uniform the internal structure of steel, the more closely the various components are connected and the more difficult it is for corrosion to invade. In addition, a layer of oxide film is attached to the surface, just like armor for steel, so it is not easy to rust.



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