Metal article layered with a nickel-phosphorus alloy and a prote

Details Metal article layered with a nickel-phosphorus alloy and a prote Metal article layered with a nickel-phosphorus alloy and a prote

1983-05-03

1985-02-05

O'Keefe, Veronica

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428469, 428472, 428457, 428333, 428629, 428666, 428679, 428680, 428926, 428936, 126901, 148 315, C25D 304, B32B 900

Patent

active

044978774

ABSTRACT:
A metal article which covered with a nickel-phosphorus alloy and which is covered on its outer surface with a protective layer which comprises CrPO.sub.4, Cr(OH).sub.3 and may also comprise Cr.sub.2 (SO.sub.4).sub.3 and in which no nickel is present. The layer provides an excellent corrosion protection. In a particular embodiment the layer is black, scratch-resistant in normal use, cannot be wiped off and is not sensitive to finger prints and is extremely suitable for decorative applications. The layers can be obtained electrolytically in a bath which comprises chromic acid and optionally reversed current in a given frequency range, a given range of current densities and a given range of ratios of cathodic to anodic pulse durations. In order to obtain the black layers the cathodic time duration is only a fraction of black layers the anodic time duration.

REFERENCES:
patent: 2769774 (1956-11-01), Loveland, Jr.
patent: 3088846 (1963-05-01), Lee
patent: 4055707 (1977-10-01), McDonald
Fan, J. C. C. et al., "Selective Black Absorbers Using Rf-Sputtered Cr.sub.2 O.sub.3 /Cr Cermet Films", App. Physics Letters, vol. 30, No. 10, pp. 511-513, (1977).
Wiederholt, The Chemical Surface Treatment of Metal Robert Draper Ltd., pp. 154, 155, 156, 158, 1965.

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