Stainless steel corrosion resistance

The corrosion resistance of stainless steel depends on chrome, but because of the chromium is one part of the steel, so the protection method is not the same. 5%, atmospheric corrosion resistance of steel increased significantly, but the chromium content is higher, although still can improve the corrosion resistance, but not obvious. Reason is that with chromium alloying of steel processing, change the type of surface oxide became similar to that of pure chromium oxide is formed on the metal surface. This tight adhesion of the surface of the rich chromium oxide protection, to prevent further oxidation. This kind of extremely thin oxide layer, you can see on the surface of the steel through natural luster, make the surface of the stainless steel has a unique. And, if damaged surface, exposed by the steel surface and atmospheric response to repair itself, to form the oxide 'passivation membrane, continue to protection. More than 5%. Commonly used alloying elements except chromium and nickel, molybdenum, titanium, niobium, copper, nitrogen, etc. , in order to meet the requirements of various applications on the microstructure and mechanical properties of stainless steel.