Stainless steel surface finish, higher ductility, toughness and mechanical strength, acid and alkaline gases, solutions and other media corrosion. It is not easy to rusty steel, but not definitely not rust. The corrosion resistance of stainless steel depends mainly on its alloy composition (chromium, nickel, titanium, silicon, aluminum, etc.) and the internal organizational structure, play a major role in the chromium. Chromium has a high chemical stability, passive film formed on the surface of the steel, the metal with the outside world to isolate and protect steel from oxidation and increase the corrosion resistance of steel. After the destruction of the passive film, the corrosion resistance on the decline.