Nanotechnology is a cutting-edge, interdisciplinary emerging science that gradually developed in the late 1980s and early 1990s. Its rapid development will become the mainstream of scientific and technological development in the 21st century. It is not only a driving force for the development of emerging fields such as information technology and biotechnology, but also provides new opportunities for the development of coatings due to its unique physical, chemical and biological properties.


 Nano coatings are generally composed of nano materials and organic coatings. More strictly speaking, they should be called nano composite coatings. Nanocomposite coatings must meet two conditions: first, at least one material has a size between 1 and 100 nm, and second, the nanophase significantly improves the coating's performance or adds new functions. Both are indispensable. Broadly speaking, nano-coating materials include two types: metallic nano-coating materials and inorganic nano-coating materials. Metallic nano-coating materials mainly refer to materials containing nanocrystalline phases, while inorganic nano-coating materials are obtained by melting and sintering nanoparticles. The nano coatings usually referred to are all organic nano composite coatings. At present, the nanoparticles used in coatings are mainly some metal oxides (such as TiO, FeO, ZnO, etc.), nano metal powders (such as nano Co, Ti, Cr, Nd, Mo, etc.), inorganic salts (such as CaCO3 ) and layered silicates.