Speaking of stainless steel valves, we are the most direct intuition that stainless steel valves will never rust, will think if we buy stainless steel valve rusty, it must be the problem of stainless steel. In actual fact, stainless steel will rust under certain conditions. Stainless steel has the ability to resist atmospheric oxidation, that is, stainless steel, but also has acid, alkali, salt medium corrosion resistance, that is, corrosion resistance. However, the size of the corrosion resistance of stainless steel with the chemical composition of the steel itself, the environmental conditions and the type of media used to change. Such as stainless steel 304 valves, in a dry and clean atmosphere, there is absolutely excellent resistance to corrosion, but to move it to the beach area, in the sea fog containing a lot of salt, it will soon rust, 316 valves Is good. Therefore, not any kind of stainless steel, in any environment can be corrosion-resistant, non-rusting. Why stainless steel valves rust it? Let us analyze the next reason, the surface of the stainless steel valve is a very thin and solid dense dense chromium-rich oxide film to prevent oxygen atoms continue to infiltrate, oxidation, access to corrosion resistance. Once the film has been destroyed by some factor, air or liquid oxygen atoms will continue to infiltrate or continuous separation of iron atoms in the metal, and then the formation of loose iron oxide, the metal surface will also continue to rust. Therefore, stainless steel will rust. What is the reason for the destruction of the stainless steel surface film it, the following we illustrate: 1, electrochemical corrosion. Stainless steel valve surface containing deposits of other metal elements of dust or heterogeneous metal particles in the humid air, the condensate between the attachment and stainless steel, the two connected into a micro-cell, triggering the electrochemical reaction, Protective film damaged. 2, stainless steel valve surface adhesion of organic juice, in the case of water oxygen, organic acids, organic acids for a long time on the metal surface corrosion. 3, stainless steel valve surface adhesion contains acid, alkali, salts, will cause local corrosion. 4, in polluted air (such as containing a large number of sulfide, carbon dioxide, nitrogen oxides in the atmosphere), the case of condensate, the formation of sulfuric acid, nitric acid, acetic acid point, causing chemical corrosion. The above conditions can cause damage to the stainless steel surface protective film rust. In order to avoid rusting stainless steel, please note the following: 1, stainless steel valve surface often clean scrub, remove attachments, eliminate the rust caused by external factors. 2, the sea area to use 316,316 L stainless steel, 316,316 L material can resist seawater corrosion. 3, some stainless steel valves on the market chemical composition can not meet the appropriate national standards, up to 304 material requirements, it will also cause rust, which requires the user to carefully choose a reputable manufacturers of products.
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