Chemistry: electrical and wave energy – Processes and products
Patent
1988-01-13
1990-02-27
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
204 29, 204 371, 204 381, 204 40, C25D 538, C25D 510
Patent
active
049043528
ABSTRACT:
A process for the electrodeposition of a multilayered coating on an article formed of titanium or titanium alloy comprises the steps of: (i) cleaning the article by conventional means, such as by descaling, dry blasing, soaking, and rinsing, so as to remove oxides and other surface contaminants therefrom and expose the article's titanium substrate; (ii) immmersing the clean article in an agitated acid bath at room temperature to activate the surface thereof; (iii) immersing the thus activated article in an agitated aqueous nickel bath preferably comprising nickel chloride at room temperature and cathodically applying a relatively thin non-porous nickel base coat directly on the exposed titanium substrate to improve subsequent zinc adhesion thereto; and (iv) immersing the nickel-plated article in an agitated aqueous zinc bath preferably comprising zinc oxide, sodium cyanide, sodium hydroxide and sodium carbonate and electrodepositing a zinc layer of desired thickness over the nickel base coat.
The thus coated titanium article is thereafter preferably baked to provide hydrogen relief therefor. Where a bright surface finish is desired, the article is thereafter dipped for a short period in a brightening solution preferably comprising sodium cyanide. Alternatively, an extra measure of corrosion resistance is obtained, where desired, by supplementary chromate treatment of the article subsequent to the hydrogen relief-baking thereof.
REFERENCES:
patent: 3647647 (1972-03-01), Winfree
patent: 4092224 (1978-05-01), Eriksson et al.
patent: 4246324 (1981-01-01), de Nora et al.
patent: 4530742 (1985-07-01), Carlin et al.
patent: 4589969 (1986-05-01), Yurkov et al.
F. A. Lowenheim, Electroplating, McGraw-Hill Book Co., New York, 1978, pp. 59, 171-182, 224.
Leader William T.
Lyon Lyman R.
Microdot Inc.
Niebling John F.
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