How Metals Are Painted with Powder Coat Automatically?

Powder coating on metal is a process of protecting metal from rusting. When a piece of metal comes into contact with air and moisture, it starts changing its color. It is due to a chemical reaction that takes place on the surface of the metal. Visit here :- http://www.imfaceplate.com/powdercoatings12/how-metals-are-painted-with-powder-coat-automatically