Causes Of Corrosion Of Metal Hoses And Treatment Methods

When the metal and oxygen in the atmosphere react, an oxide film is formed on the surface. The iron oxide formed on ordinary carbon steel continues to oxidize, allowing rust to expand and eventually form holes. Paint or oxidation-resistant metals (e.g. zinc, nickel and chromium) can be used for electroplating to ensure carbon steel surfaces, but, as is known, this protection is only a thin film.

If the protective layer is destroyed, the steel below begins to rust. The corrosion resistance of metal hoses depends on the content of chromium, when the amount of chromium added to 10.5%, the resistance of steel to atmospheric corrosion increased significantly, but when the chromium content is higher, although it can still improve corrosion resistance, but not obvious. The reason is that when the steel is alloyed with chromium, the type of surface oxide is changed to form a surface oxide similar to that formed on pure chromium metal.

This tightly glued chromium-rich oxide protects the surface from further oxidation. This oxide layer is extremely thin, through which the natural luster of the stainless steel surface can be seen, so that stainless steel has a unique surface. Moreover, if the surface is damaged, the exposed steel surface will be self-repaired with the atmospheric reaction, re-forming this  "passivation film ", continue to play a protective role