Corrosion Causes Of Hose

Causes of corrosion

Oxide films are formed on the surface of metals after they react with oxygen in the atmosphere. The iron oxide formed on common carbon steel continues to be oxidized, which enlarges the corrosion and eventually forms holes. Carbon steel can be electroplated with paint or oxidation-resistant metals (e.g., zinc, nickel and chromium), but as is known, this protection is only a thin film. If the protective layer is damaged, the steel below begins to rust.

The corrosion resistance of stainless steel hose depends on the content of chromium. When the content of chromium is 10.5%, the atmospheric corrosion resistance of steel increases significantly, but when the content of chromium is higher, although the corrosion resistance can still be improved, it is not obvious. The reason is that when chromium is used to alloying steel, the type of surface oxide is changed to a surface oxide similar to that formed on pure chromium metal. This tightly adhered chromium-rich oxide protects the surface from further oxidation. This kind of oxide layer is very thin, through which the natural gloss of 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 repair itself with the atmospheric reaction, and the passive film will be re-formed, which will continue to play a protective role.