Process for chromating metallic surfaces

Details Process for chromating metallic surfaces Process for chromating metallic surfaces

1977-04-29

1978-04-04

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

204 56R, C25D 502, C25D 1100, C25D 1138

Patent

active

040826201

ABSTRACT:
A process is described for cathodically depositing chromate films on metal surfaces. Metal surfaces of interest are copper, and copper alloy surfaces, nickel, and nickel alloy surfaces, and iron and iron alloy surfaces. Particular electrolytic conditions and solution compositions yield chromate films which are advantageous in many applications including protection of surfaces against corrosion and improved adhesive characteristics of metal surfaces toward various films including organic (paint, etc.) films. In addition, chromate films produced in accordance with the described procedure are advantageous as plating masks for electrolytic deposition of gold.

REFERENCES:
patent: 1750418 (1930-03-01), McFarland
patent: 1857929 (1932-05-01), McFarland
patent: 2028013 (1936-01-01), Reilly
patent: 3475295 (1969-10-01), Smith et al.
patent: 3518169 (1970-06-01), Oyama
patent: 3523067 (1970-08-01), Baird-Kerr et al.
patent: 3625844 (1971-12-01), McKean
patent: 3632389 (1972-01-01), Vazirani
patent: 3772165 (1973-11-01), Yamagishi
Metal Finishing, Sept. 1975, pp. 29-35.
Journal of Electrochemical Society, June 1973, vol. 120, No. 6, pp. 735-738.
Modern Electroplating, 2nd edition, 1963, F. W. Lowenheim, pp. 224-244.
Gold Plating Technology, by Frank Reid et al., 1974, pp. 21-52.

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