Introduction to stainless steel
Generally speaking, stainless steel is not easy to rust steel, in fact, some stainless steel, both stainless steel and acid resistance (corrosion resistance).
The rust resistance and corrosion resistance of stainless steel are due to the formation of chromium rich oxide film (passivation film) on the surface of stainless steel. This film can isolate the metal from the external medium, prevent the metal from further corrosion, and have the ability of self-healing. Once damaged, the chromium in the steel and the oxygen in the medium will regenerate the passive film and continue to play a protective role.
This rust resistance and corrosion resistance are relative. The results show that the corrosion resistance of steel increases with the increase of chromium water content in the weak medium such as atmosphere, water and nitric acid. When the chromium content reaches a certain percentage, the corrosion resistance of steel changes suddenly, that is, from easy to rust to not easy to rust, from non corrosion to corrosion resistance. Stainless steel stainless steel, but also related to the use of the environment, different environments, to use different chromium content of stainless steel.