Technical question: why does the metal expansion joint have corrosion resistance?
According to some common problems, Shanghai Dongfeng Pneumatic Butterfly Valve Group Co., Ltd. will solve the corrosion resistance of metal expansion joints. Here are some introductions, hoping to help you.
After the metal reacts with oxygen in the atmosphere, an oxide film will form on the surface. The iron oxide formed on ordinary carbon steel continues to be oxidized, so that the corrosion continues to expand and eventually forms holes. Paint or oxidation resistant metals (such as zinc, nickel and chromium) can be used for electroplating to ensure the surface of carbon steel, but, as is known, this protection is only a film. If the protective layer is damaged, the steel below will start to rust. The corrosion resistance of stainless steel hose depends on the chromium content. When the chromium content reaches 10.5%, the atmospheric corrosion resistance of steel increases significantly, but when the chromium content is higher, although the corrosion resistance can still be improved, it is not obvious. The reason is that when the steel is alloyed with chromium, the type of surface oxide is changed to be similar to the surface oxide formed on pure chromium metal. This tightly adhered chromium rich oxide protects the surface from further oxidation. This kind of oxide layer is thin, through which the natural luster of the stainless steel surface can be seen, making the stainless steel have Surface. Moreover, if the surface layer is damaged, the exposed steel surface will react with the atmosphere to repair itself, and form this "passive film" again to continue to play a protective role. Shanghai Dongfeng Pump Valve Factory will solve some common problems about why metal hoses are corrosion resistant. Here are some introductions, hoping to help you.
Pneumatic butterfly valve: a ball valve made of the compressibility of air in a closed container. Compared with ordinary ball valves, it has significant advantages: relatively slow speed, little dynamic force change (generally within 1:1.2), and easy control; The disadvantage is that the volume is smaller than the screw ball valve, the cost is high, and the service life is relatively short.