Painting the metal surface is a method of protecting the metal from oxidation. The phenomenon of corrosion around us refers to the damage, degradation or deterioration of the properties of various materials under the action of the environment (a combination of chemical, electrochemical and several physical factors). And spray painting on metal surface is a very important means of metal corrosion protection. Good paint coating protection layer to maintain continuous integrity, good combination, can become a barrier to inhibit the invasion of corrosive media.