Chemistry: electrical and wave energy – Processes and products
Patent
1985-05-01
1986-01-21
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
C25D 356
Patent
active
045656118
ABSTRACT:
A process and compositions for the electrodeposition of hard, tarnish-resistant, white shining nickel- and cobalt-containing coatings using aqueous acidic baths containing metal ions and boric acid and also, as shine promotor, an aliphatic aldehyde and an aromatic carbonyl compound and, optionally, wetting agents, wherein aqueous solutions containing nickel, cobalt and chloride ions and boric acid and having a pH-value of from 3.6 to 4.8 and a nickel to cobalt ion ratio of from 8:1 to 20:1 are prepared, an aqueous solution of an aliphatic aldehyde and an aromatic, water-soluble carbonyl compound in a quantitative ratio of from 20:1 to 50:1 is added as shine promotor, layers containing nickel and cobalt are electrodeposited onto base material suitable for nickel plating at a temperature of from 50.degree. to 55.degree. C. and at a cathodic current density of up to 7 A.dm.sup.-2 using nickel and optionally, cobalt metal in a ratio by weight of from 5:1 to 10:1 as the anode material.
REFERENCES:
patent: 2026718 (1936-01-01), Weisberg et al.
patent: 3093557 (1963-06-01), Cope et al.
patent: 4069112 (1978-01-01), Harbulak
Nee Monika
Scharwaechter Klaus
Wagner Heinz
Gerhard Collardin GmbH
Greenfield Mark A.
Kaplan G. L.
Millson Jr. Henry E.
Szoke Ernest G.
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