Electrochemical degradation of iron-based metals causes rust to form. This disintegration results from oxidation, the process by which molecules on the iron's surface interact with oxygen in the air to form a new molecule known as Fe2O3 or iron oxide. Rust is that iron oxide. The pure iron oxidizes less quickly. If you look closely at an old iron engine block, you'll notice that the rust has just slightly penetrated the metal's surface. Make sure that you get the best Car Paint Auckland.