Chemistry: electrical and wave energy – Processes and products
Patent
1982-09-27
1984-06-05
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
204 56R, 204 56M, 204 38A, 430278, 101454, 101456, 101459, 101458, C25D 1102, C25D 1108, C25D 1110
Patent
active
044526741
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. 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.
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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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