Coating technology is widely used in machinery, electronics, optics, aerospace, chemical, textile and food industries and other departments. The use of high-tech means can not only deposit all kinds of metals and alloys, but also deposit a variety of compounds, not only deposited on the metal substrate, but also in ceramics, diamonds, glass and even non-metallic plastic deposition, it is no exaggeration to say, Coating technology has penetrated into all areas of the national economy