Chemistry: electrical and wave energy – Processes and products
Patent
1982-09-27
1984-05-15
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
204 32R, 204 32S, 204 38A, 204 56R, 204 56M, 430278, 101454, 101456, 101459, 101458, C25D 1102, C25D 1108, C25D 1110
Patent
active
044486472
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 poly basic organic acid as electrolyte together with a strong inorganic acid such as phosphoric acid or further admixed with another strong inorganic acid such as sulfuric. 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 or aluminum. 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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