Corrosion is a process in which metals deteriorate due to chemical reaction with moisture ,air and chemicals.Rusting of iron is a major example of corrosion.Iron corrodes in presence of moisure and air.
Rancidity The process of oxidation of fats and oils which can be noticed by a change in colour, smell, and taste is known as rancidity. Example: When butter is kept in the open atmosphere than its smell and taste change which results in rancidity.