Chemistry: electrical and wave energy – Processes and products
Patent
1982-03-18
1983-08-16
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
204 38R, 204 56R, 204 58, 101459, C25D 1110, C25D 1124
Patent
active
043990215
ABSTRACT:
According to the invention there is provided an electrochemical process for applying a firmly bonded insoluble metal oxide-organic complex on a metal surface by employing the metal as anode and a water-soluble polybasic organic acid 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. Repetitive cycle pulsed 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.
REFERENCES:
patent: 2578400 (1951-12-01), Cohn
patent: 2918416 (1959-12-01), Taylor
patent: 3307951 (1967-03-01), Adams et al.
patent: 3857766 (1974-12-01), Woods
Gillich Thomas N.
Rozell William J.
Walls John E.
Wanat Stanley F.
American Hoechst Corporation
Andrews R. L.
Burnett Leo S.
Roberts Richard S.
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