When the surface of the stainless steel appears brown rust (dot), people are very surprised: "Stainless steel will not rust, rust is not stainless steel, it may be a problem with steel." In fact, this is a lack of understanding of stainless steel A one-sided wrong view. Stainless steel will also rust under certain conditions. \x0d stainless steel has the ability to resist atmospheric oxidation, that is, stainless, and also has corrosion resistance in medium containing acid, alkali and salt. The ability is corrosion resistance. However, the corrosion resistance is related to the chemical composition of the steel itself, the mutual state, the conditions of use and the type of environmental medium. For example, 304 material, in the dry and clean atmosphere, is absolutely excellent. Corrosion resistance, but moving it to the coastal area, in the sea fog containing a lot of salt, it will soon rust. Therefore, not any kind of stainless steel, can resist corrosion at any time, no rust. X0d stainless steel is a very thin and strong and stable chromium-rich oxide film (protective film) formed on the surface to prevent oxygen atoms from continuing to infiltrate and continue to oxidize, and obtain corrosion resistance. For some reason This film Under constant damage, air or liquid neutralizing oxygen atoms will continue to infiltrate or the iron atoms in the metal will continuously separate out, forming loose iron oxide, and the metal surface will be continuously rusted. This surface film is destroyed. Many \x0d rust causes are often seen in the following daily life: \x0d1, stainless steel surface storage of dust containing other metal elements or attachment of heterogeneous metal particles, in humid air, between the attached matter and the stainless steel Condensed water, the two are connected into a micro-battery, causing an electrochemical reaction, the protective film is destroyed, which is called electrochemical corrosion. \x0d2, the surface of the stainless steel is adhered to organic juice (such as melon, noodle soup, etc.) In the case of water and oxygen, the organic acid is formed, and the organic acid is corroded on the metal surface for a long time. The surface of the stainless steel adheres to the acid, alkali and salt substances (such as the alkali water and lime water spray on the wall). Cause local corrosion. \x0d4, in polluted air (the atmosphere containing a large amount of sulfides, oxides, hydrogen oxide), in the case of condensed water, \x0d forms sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion. Any situation above x0d can cause damage to the stainless steel surface protective film and cause corrosion. Therefore, in order to ensure that the metal surface is permanently bright and not rusted, we recommend that: \x0d1 must always clean and scrub the decorative stainless steel surface to remove the attachment and eliminate External factors causing corrosion. \x0d2 There is a kind of stainless steel of 201 and 202 material on the market which is easy to rust in the coastal area. It is suitable for use in the environment without industrial pollution and air corrosion. \x0d3 beach area should use 304 stainless steel, 304 material Can resist seawater corrosion. \x0d buy some oxalic acid: look at the place where the toilet supplies are sold in the supermarket, or go to the building materials store to sell the gypsum powder. oxalic acid can completely reduce the rust, make the rust into ferrous oxalate, with water A flush as bright as new, and the oxalic acid treated surface metal has been passivated and is not easily rusted.