Rusting:
It is the reaction of iron with air (oxygen) and water to form rust (hydrated iron(III) oxide). Rusting is a redox process. Many a times, this rusting needs to be prevented, and for that some methods have been devised, for example, rusting can be prevented by painting, coating with oil or grease, metal planting or electroplating, and also by sacrificial protection.
Stainless steel is an example of an alloy of iron that has been made specifically resistant to corrosion.