Chemistry: electrical and wave energy – Apparatus – Coating – forming or etching by sputtering
Patent
1989-06-05
1990-04-10
Niebling, John F.
Chemistry: electrical and wave energy
Apparatus
Coating, forming or etching by sputtering
204 42, 204228, C25D 1122, C25D 2112
Patent
active
049158015
ABSTRACT:
A process and circuitry for the electrolytic coloring of an anodized article of aluminum or aluminum alloy in a coloring bath containing at least one metal salt for coloring the article. The process comprises applying to the coloring bath a controllable, asymmetrical and substantially sinusoidal a.c. voltage of substantially constant frequency. The sinusoidal a.c. voltage is obtained from a voltage source supplying a symmetrical sinusoidal a.c. voltage and at least one of the two current paths is divided into two parallel main lines and fed to electrical components whereby the amplitude level of the positive half wave and the amplitude level of the negative half wave and the ratio of the amplitude level of the positive half wave to the amplitude level of the negative half wave of the a.c. voltage applied to the coloring bath are made variable and adjustable independently of one another, adjusting the positive half wave and the negative half wave to the desired values, and recombining the main lines to form the a.c. voltage applied to the coloring bath.
REFERENCES:
patent: 3704209 (1972-11-01), Patrie
patent: 4316780 (1982-02-01), Yoshida et al.
Brodalla Dieter
Costello James W.
Huppertz Werner
Munk Karl-Heinz
Wagner Georg
Grandmaison Real J.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Leader William T.
Niebling John F.
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