Oct 18, 2020
Metal and oxygen in the atmosphere in the oxide film formed on the surface. In continuation of iron oxide is formed on oxidation of ordinary carbon steel, corrosion continued to expand, eventually forming holes. You can use paint or oxidation of metal (for example, zinc, chromium and nickel) plating to ensure the surface of carbon steel, but as you know it, this protection is only a film. If the protective layer is damaged, the following steel begins to rust.
Corrosion resistance of stainless steel hose depends on chromium content, when chromium is added to 10. 5%, significantly increased resistance to atmospheric corrosion of steel, but higher chromium content, although you may still increase corrosion resistance, but not obvious. Because when alloyed with chromium on steel, changed into similar to the type of surface oxide formed on the surface of pure chromium metal oxides. This tight adhesion of chromium-rich oxide surface, preventing further oxidation. This kind of very thin oxide layer, through which you can see the natural shine of the stainless steel surface, stainless steel has a unique surface. And if the damaged surface, exposed steel surfaces and the atmospheric response to repair itself, forms the "passivation", continues to play a protective role.