Process for pretreating strips and foils of aluminum or aluminum

Details Process for pretreating strips and foils of aluminum or aluminum Process for pretreating strips and foils of aluminum or aluminum

1986-03-10

1990-12-11

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 28, 204 58, C25D 906

Patent

active

049768271

ABSTRACT:
Prior to coating with lacquer or adhesive, or laminating with plastic, strips or foils of aluminum or aluminum alloys are pretreated in an electrolyte by electrochemical oxidation using alternating current. These strips or foils are passed through an aqueous electrolyte which is heated to 25.degree.-95.degree. C. and has a pH adjusted to 4.2-12.5. The electrolyte is silicate-free and contains 0.01-10 weight percent of an organic compound which forms a complex with aluminum. A current of 10-500 coulomb/dm.sup.2 is supplied to the workface of the strips or foils.

REFERENCES:
patent: 3243362 (1966-03-01), Manhart
patent: 3755116 (1973-08-01), Terai et al.
patent: 3824159 (1974-07-01), Wehrmann
patent: 3915811 (1975-10-01), Tremmel et al.
patent: 4014758 (1977-03-01), Kawai et al.

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