Provision of surface layers of copper or copper alloyed with zin

Details Provision of surface layers of copper or copper alloyed with zin Provision of surface layers of copper or copper alloyed with zin

1980-04-11

1981-06-09

Kendall, Ralph S.

Coating processes

Immersion or partial immersion

Metal base

427437, 106 123, 106 126, C23C 302

Patent

active

042725704

ABSTRACT:
A process for providing surface layers of copper or copper alloyed with zinc on die castings of zinc or zinc alloys comprises a step of immersing the castings in an agitated bath containing an aqueous vehicle, which has been adjusted to a pH of from 8 to 10, and to which cupric oxide has been added as a powder in an amount of approximately from 200 to 250 grams per liter of the agitated bath. Cuprous oxide may be substituted for cupric oxide. At a pH not exceeding 8.5, the surface layer tends to be copper alloyed with zinc. At a pH exceeding 8.5, the surface layer tends to be copper. At a pH of 9, the surface layer of copper tends to be very adherent. The pH is adjusted by addition of sodium hydroxide, potassium hydroxide, or ammonium hydroxide, preferably sodium hydroxide.

REFERENCES:
patent: 43557 (1864-07-01), Weil
patent: 3033703 (1962-05-01), Schneble et al.
patent: 3046159 (1962-07-01), Brookshire
patent: 3664933 (1972-05-01), Clauss
patent: 3716462 (1973-02-01), Jensen
patent: 4036651 (1977-07-01), Weiner
patent: 4199623 (1980-04-01), Nuzzi et al.
Lowenheim, Ed., Modern Electroplating, Wiley-Interscience (1974) 3rd Edition, pp. 613-615, 776, 605, 6, 7, 448-495.
Metals Handbook, vol. 2, (American Soc. for Metals, 8th Ed. 1964) pp. 458-460.

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