PASSIVATED STAINLESS STEEL TUBE IS IMPORTANT MEMBRANOUS

Stainless steel is extremely thin and sturdy fine and stable chromium-rich oxide film formed on the surface protective film against and prevent the continued infiltration of oxygen atoms, to oxidation, to obtain resistance to corrosion. Once there is some reason, this film was a continual disturbance, air or liquid oxygen atoms will continue to infiltrate or metal from the iron atoms constantly analyze it, to form a loose iron oxide, metal surface rust will continue to suffer.

This form of stainless steel tube surface film damaged many of everyday life in common are stainless steel surface accumulating the attachments contain other metal elements or heterogeneous metal particles of dust in the humid air, and stainless steel fixtures between condensate, the two together into a micro-battery, causing the electrochemical reaction protective film is damaged, known that the electrochemical corrosion. Stainless steel tube surface adhesion of organic juice such as vegetables, soup, sputum, etc., in the case of water oxygen to form organic acids, organic acids long is the corrosion of the metal surface. Stainless steel tube surface adhesion containing acid, alkali, salts such as wall decoration alkaline, lime splash, causing localized corrosion. Pollution in air, such as containing a large amount of sulfide, carbon monoxide, nitrogen oxide atmosphere, the case of condensed water to form sulfuric acid, nitric acid, acetic acid solution point, caused by chemical corrosion.

Stainless steel tube so as to have more other pipes irreplaceable advantages, Engineering will be more and more use will become increasingly popular, a good prospect. With the implementation of China’s reform and opening up policy, the rapid growth of the national economy to get urban housing, public buildings and the construction of a large number of tourist facilities, hot water supply and domestic water supply put forward new demands. In particular water quality issue, there is growing attention, is also rising. Stainless steel is an austenitic chromium-nickel stainless steel with good oxidation resistance, corrosion resistance, because a higher percentage of chromium and nickel have so much better creep strength at high temperature continuous operation, it has a good temperature resistance . Stainless steel due to the nickel Ni, chromium Cr content, with good resistance to oxidation, corrosion, acid and salty, high temperature performance, high temperature electric furnace steel dedicated to the manufacture of tubes and other occasions, austenitic stainless steel in the increased carbon content, Because of its solid solution strengthening effect of the strength is improved, the chemical composition of austenitic stainless steel properties are chromium, nickel-based add molybdenum, tungsten, niobium and titanium and other elements, because of its organization as a face-centered cubic structure, which at high temperatures under a high strength and creep strength at low melting solid oxide thin skin aging parts, usually lavender, the scale of such parts is relatively easy to deal with.

After parts by stainless steel pickling passivation pickling, the surface of the oxide scale has been basically in addition to clean and does not corrode parts, parts surface without leaving gray hanging directly subsequent passivation process. Parts after pickling passivation process in air poor corrosion resistance, such as exposure to air, the parts of the surface rust. To enhance the corrosion resistance of parts, the parts must generate a dense surface, good corrosion resistance of passive film, in order to achieve the purpose of corrosion resistance.