Process for obtaining a range of colors of the visible spectrum

Details Process for obtaining a range of colors of the visible spectrum Process for obtaining a range of colors of the visible spectrum

1993-12-30

1996-04-23

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Forming multiple superposed electrolytic coatings

205105, 205121, 205324, C25D 1120, C25D 1122

Patent

active

055100155

ABSTRACT:
A process for obtaining a range of colors of the visible spectrum includes a first phase to form an anodic film, a second phase to modify a barrier film and a third phase to deposit metallic particles on the barrier film. During the formation of the anodic film, a thickness in excess of 0.3 .mu.m is obtained. The electrolytic modification of the barrier film is carried out in a low dissolving power electrolyte, applying a predetermined low voltage and a predetermined low current density. The third phase is carried out by an electrolytic deposition of metallic particles in order to increase internal reflections under the deposit. The average voltage applied in the electrolytic modification of the barrier film is below 5 volts of a complex alternating current, and the average density of the current applied is less than 200 mA/dm.sup.2 of the complex alternating current.

REFERENCES:
patent: 3850762 (1974-11-01), Smith
patent: 4414077 (1983-11-01), Yoshida et al.
patent: 4421610 (1983-12-01), Rodriguez
patent: 4808280 (1989-02-01), Hinoda
patent: 4869789 (1989-09-01), Kurze et al.
patent: 4968389 (1990-11-01), Satoh et al.

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