Nano coating is the application of nanotechnology in engineering, he is form a dense layer of nano coating on the surface of the object of the new type of spraying technology. The undercoat layer contains a high hardness, high corrosion resistance of nanomaterials can provide a variety of color and gloss, is an environmentally friendly, economical, durable surface treatment. Nano-coating is not a sacrificial coating does not provide a sacrificial surface scratches may cause erosion of the raw materials, but its excellent acid, salt and alkaline, high hardness, high stability, to a certain extent, can replace the plating process. Common surface treatment than more excellent performance, according to demand, in a certain number of cases, can be painted in different colors.