Electro-co-deposition of corrosion resistant nickel/zinc alloys

Details Electro-co-deposition of corrosion resistant nickel/zinc alloys Electro-co-deposition of corrosion resistant nickel/zinc alloys

1979-08-22

1981-08-04

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 38B, 204 40, 204 43Z, C25D 356, C25D 504, C25D 512

Patent

active

042820731

ABSTRACT:
Novel plating baths and the processes for plating therewith are disclosed which provide corrosion-resistant nickel/zinc alloy coatings containing 13-15 weight/% of nickel for iron or steel substrates. The novel baths have combined nickel and zinc contents in the range of 14 to 24 ounces of metal per gallon with the ratio of nickel to zinc maintained in the range 0.1:0.4. These baths permit satisfactory plating of the alloy to be achieved at current densities in the range 30 to 120 amperes per square foot. At alloy coating thicknesses in the range 0.00005 to 0.0005 inches, a salt spray corrosion resistance in excess of 0.5 hours per microinch is afforded. Additionally, by coating the substrate, before alloy plating, with a substantially pure nickel priming layer, the corrosion resistance rate can be effectively doubled. Apparatus for the continuous plating of the priming layer and the corrosion-resistant alloy layer is also described.

REFERENCES:
patent: 2419231 (1947-04-01), Schantz
patent: 3420754 (1969-01-01), Roehl
patent: 3558442 (1971-01-01), Roehl et al.
patent: 3691027 (1972-09-01), Hartford et al.
Dini et al., "Electrodeposition of Zinc-Nickel Alloy Coatings," Metal Finishing; Aug., 1979, pp. 31-33; Sep., 1979, pp. 53-57.

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