Metals can react with oxygen in the atmosphere to form oxide film on the surface. Iron oxide formed on common carbon steel will continue to oxidize, which will expand the corrosion and eventually form holes. This can be done by electroplating paints or oxidizing-resistant metals to protect the surface of carbon steel, but the protective layer is only a thin film. If the protective layer is damaged, the steel www.zhutiezhamen.net.cnwww.buxiugangwanguan.cnwww.penwuganzaojii.cnwww.gangchensu.cn
www.chenban.net.cnwww.taocichenban.cnbelow begins to rust again. Whether the stainless steel pipe is corroded or not depends on the chromium content in the steel. When the chromium content in the steel reaches 12%, a passive and dense chromium-rich oxide is formed on the surface of the stainless steel pipe to protect the surface, which can prevent further oxidation. This kind of oxide layer is very thin, through which the natural luster of steel surface can be seen, so that stainless steel has a unique surface. If the chromium film is destroyed, the chromium in the steel and oxygen in the atmosphere will regenerate the passive film and continue to play a protective role. In some special circumstances, stainless steel will also appear some local corrosion and failure, but unlike carbon steel, stainless steel will not appear uniform corrosion and failure, so the corrosion margin for stainless steel pipes is meaningless.