We often have online customers to consult us online, what is the cause of the white fog in the film when the glass workpiece is coated by the vacuum coating machine, because I have tried many methods and can't solve it, so I seek help online. For a professional vacuum coating technical engineer, the white fog is formed in the film, and they can quickly use the elimination aspect to find the reason. Therefore, it is very advantageous to have strong professional ability and technology. So what are the reasons for the formation of white fog in the membrane?

1. The substrate is dirty, and the residue of the previous project is attached
      2. Corrosion and pollution of lens surface
      3. The mismatch between the film material and the film material, and between the film material and the substrate.
      4. Insufficient oxygenation of oxides.
      5. The first layer of zirconia film material may produce white halo phenomenon on some substrates
      6. The substrate is polluted by moisture before entering the cover (after cleaning)
      7. Poor cleaning or wiping, cleaning marks, wiping marks
      8. The vacuum chamber is dirty and the water vapor is too heavy
      9. High humidity

      There is white fog in the film on the glass of the workpiece coated by the vacuum coating machine. Ideas for improvement: the problem of the substrate itself may be the main problem, and the coating should try to make up for it. The biggest possibility of the coating itself is the matching problem of the film material.
      Improve strategy:
      1. Improve the film system, the first layer does not need zirconia.
      2. Minimize the opening time of the vacuum chamber, and do the cleaning and coating preparation work of the vacuum chamber in the shortest time between the hood and the hood.
      3. After replacing the guard plate and cleaning the vacuum chamber, it is better to vacuum and bake the vacuum chamber. The replaced guard plate and other vacuum chamber components must be dry and clean.
      4. Improve the environment
      5. Properly protect the lens on the umbrella before entering the cover from pollution.
      6. Improve cleaning and wiping effect.
      7. Improve film matching (consider Al2O3 for the first layer)
      8. Improve membrane oxygenation and evaporation rate (reduce)
      9. Speed up the process of pre-engineering. The protection of the processed smooth surface is strengthened in the previous project.
      10. The polished surface must be cleaned immediately, and there should be no polishing powder or other impurities attached to it.