Electrolytes for electrochemically treating metal plates

Details Electrolytes for electrochemically treating metal plates Electrolytes for electrochemically treating metal plates

1984-12-10

1986-03-25

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 321, 204 34, 204 383, 204 56R, 204 56M, 101454, 101456, 101459, C25D 544

Patent

active

045781567

ABSTRACT:
The invention provides an electrochemical process for applying a firmly bonded substantially insoluble metal oxide-organic complex on a metal surface by employing the metal as anode and a water-soluble polybasic organic acid plus a base as electrolyte. The polybasic acid may be a polyphosphonic acid, polyphosphoric and polycarboxyl acid, or polysulfonic acid and is advantageously polymeric. Polyvinyl phosphonic acid (PVPA) is a preferred electrolyte. Direct current is used. The insoluble metal oxide-organic complex formed is composed of anodic oxide combined with polyacid, which forms a protective layer on the metal of improved corrosion resistance. The metal oxide-organic complex is well-suited to bond light sensitive coatings thereto. The metal may be steel, aluminum or magnesium. The process is economical and the product novel. Sufficient base is added to give the electrolyte a pH in the range of from about 3 to about 10.

REFERENCES:
"The Surface Treatment of Al & Its Alloys", by S. Wernick et al., 3rd Ed., 1964, pp. 348, 365.

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