Vacuum metallizing process

Details Vacuum metallizing process Vacuum metallizing process

1978-03-16

1980-01-15

Newsome, John H.

Coating processes

Electrical product produced

Welding electrode

427250, 427404, 427407C, B05D 306

Patent

active

041839757

ABSTRACT:
This invention is directed to a vacuum metallizing process and, particularly, to an improved process for applying thin chromium coatings to the surface of both rigid and flexible plastic articles. The method includes securing a high purity chromium bar between spaced electrodes, mounting the articles to be coated in proximity to the bar, passing an electric current directly through the bar sufficient to evaporate chromium from the surface thereof, and condensing the evaporated metal on the surface of the plastic articles. The method is carried out at a subatmospheric pressure in the range of 2 to 5.times.10.sup.-5 mm Hg. Articles made in accordance with the method disclosed possess an adherent bright, reflective chromium film of a thickness in the range of about 800 to 1000 A.

REFERENCES:
patent: 2422609 (1947-06-01), Auwarter
patent: 2793143 (1957-05-01), Kohring
patent: 2891880 (1959-06-01), Nakken
patent: 2904452 (1959-09-01), Reichelt
patent: 2962393 (1960-11-01), Ruckelshaus
patent: 3992477 (1976-11-01), Dickie et al.
patent: 4016305 (1977-04-01), Wakabayashi et al.

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