Evaporation vacuum coating machine do aluminum plating why yellow and black?
1, aluminum source contains too many impurities, the general purity should be 9999 or 99999 or more.
2, coating machine vacuum is not up to standard, should reach 10 -7 times pa.
3, coating articles cleaning is not complete, the surface residual cleaning agent and water and so on.
4, coating surface temperature is unreasonable, the temperature is too high or too low.
5. The electric potential setting of coated articles is unreasonable.
6, vacuum diffusion pump should be changed oil.
7, adjust the temperature of the evaporation source, not too low or too high.
8. If the electron beam evaporates, the electron beam bombardment position should be adjusted.