Process for pretreating strips and foils of aluminum or aluminum alloys
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United States of America Patent
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-
Dec 11, 1990
Issued Date -
N/A
app pub date -
Mar 10, 1986
filing date -
Mar 16, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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