A lot of people are in used chromatic stainless steel, after using 3, 4 years, material surface can appear rust, drop paint to wait, and the stainless steel that major consumer place USES does not have this kind of circumstance to happen not only, and more beautiful than before using;Have investigation report to show, in the report was used to 200 stainless steel made a simple interview, discovery appears rusting, drop lacquer circumstance besides a few part is product quality problem, the phenomenon such as occurrence rust, drop lacquer because of be short of to stainless steel material maintenance the rest.
There will be a question here, stainless steel performance is so good, why will there be such a situation?
People in the industry know, the surface of stainless steel has a very thin, strong and stable rich chromium oxide film, stainless steel is rust, on this layer of oxide film prevent oxygen atoms infiltration oxidation reaction and lead to rust;If this layer of protective film appears damaged condition, nature also cannot achieve the function such as rustproof.
1. Stainless steel is located in a humid environment, in the case of water and oxygen, the formation of organic acids on the surface of stainless steel erosion damage.
2. When installing stainless steel products, they will be mechanically damaged by the installation tools and thus damage the surface protective film.For example, when installing stainless steel bolts in the outdoor curtain wall project, the wrench will cause mechanical damage to the place where the bolt head comes into contact. After rain water washing, the stainless steel bolt head will appear slight rust.
3. There are dust impurities or metal particles on the surface of stainless steel, which is prone to electrochemical reaction with stainless steel in humid air, accelerating the corrosion of stainless steel.
4 stainless steel surface contact with acid, alkali, salt and other substances vulnerable to chemical reaction corrosion.For example, the curtain wall fasteners in coastal cities are generally 316 stainless steel products (more corrosion resistant than 304 stainless steel), because the high salt in the air in coastal cities is easy to cause corrosion of stainless steel.
Above is the color of stainless steel rust, paint off the real cause of quality problems
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Post time: Jan-19-2019