Chemistry: electrical and wave energy – Processes and products
Patent
1975-09-26
1976-11-02
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
204 29, 204 38B, C25D 544
Patent
active
039896064
ABSTRACT:
An improved process for metal plating on aluminum wherein a zinc immersion coating is applied to the aluminum to dissolve undesirable oxides on the aluminum surface. The improvement comprises a controlled dissolution of the zinc layer followed by immediate plating of the surface with another metal such as nickel. The dissolution of the zinc surface is monitored by immersing the zinc-coated aluminum, together with a nickel electrode, in an electrolytic bath and monitoring the electrode potential difference between the electrodes. The subsequent metal plating step is commenced when the electrode potential difference between the electrodes falls about 100-200 millivolts below the initial electrode potential difference at the particular temperature and bath composition.
REFERENCES:
patent: 2142564 (1939-01-01), Korpiun
patent: 2662054 (1953-12-01), Passal
patent: 2739932 (1956-03-01), Forestek
patent: 2745799 (1956-05-01), Patrie
patent: 3493474 (1970-02-01), Weber
Aluminum Company of America
Kaplan G. L.
Taylor John P.
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