RPGMemes

This is not true. Oxidation is a broad type of chemical reaction involving the loss of electrons. Rust is a type of oxidation, much as a square is a type of rectangle. Oxidation can occur on the surface level (tarnishing of some metals, passivation of aluminum) or throughout (combustion). Rust actually only occurs on the surface as well, but the iron oxide is less dense than the metal and it increases the available area of the surface exposed to oxygen.