What are the factors affecting stainless steel
The decisive role of chromium in stainless steel: there is only one element that determines the property of stainless steel, that is, chromium. Each type of stainless steel contains a certain amount of chromium. So far, there is no chromium free stainless steel. The fundamental reason why chromium has become the main element that determines the performance of stainless steel is that the addition of chromium as an alloy element in steel promotes the development of internal contradiction movement in favor of resisting corrosion damage. This change can be explained from the following aspects:
① Chromium increases the electrode potential of iron-based solid solution
② Chromium absorbs electrons from iron and passivates it
Passivation is a phenomenon that the corrosion resistance of metals and alloys is improved because the anodic reaction is prevented. There are many theories of metal and alloy passivation, including thin film theory, adsorption theory and electron arrangement theory.