Before the optical pvd coating machine process is started, the vacuum material should be cleaned to remove contaminants from the surface of the workpiece or system material; the surface cleaning treatment of vacuum parts is also very necessary, because the gas and vapor source caused by the contaminants when the machine is activated later will be The vacuum system cannot reach the required degree of vacuum, and at the same time, the strength and sealing performance of the vacuum components are also connected. In this way, the film coated by the pvd coating machine will not meet the standard in the later stage. Vacuum plating materials are most susceptible to contamination when exposed to air. There are many sources of contamination. The initial contamination is usually part of the formation process of the surface itself. Adsorption phenomena, chemical reactions, leaching and drying processes, mechanical treatments, and diffusion and segregation processes all contribute to increased surface contamination of various components.

 So what are the types of contaminants on the surface of the more common vacuum materials:
       1. Water-based products: hand sweat during operation, water vapor during blowing, saliva, etc.;
       2. Acids, alkalis and salts: residual substances during cleaning, hand sweat, minerals in water, etc.;
       3. Surface oxide: the surface oxide formed by the material being placed in the air for a long time or placed in the humid air;
       Fourth, polishing residues and dust and other organic matter in the ambient air.
       Five: Grease: lubricants, cutting fluids, vacuum greases, etc. contaminated during processing, assembly, and operation;
 
       Before the optical pvd coating machine uses the coating material to coat, a simple surface cleaning of the coating material can prolong the service life of the coating machine, which is an indispensable link that cannot be reduced. Because various contaminants not only make the vacuum system unable to obtain the required vacuum degree, but also affect the strength and sealing performance of the vacuum parts connection. The cleaning work in place in the early stage can reduce a lot of trouble and avoid the occurrence of many small problems, which has a very positive effect on the work efficiency and the coating quality of the optical pvd coating machine. It can greatly improve the working stability of all the walls and other component surfaces in the vacuum system under various working conditions, and the cleaning process directly determines