Chemistry: electrical and wave energy – Processes and products
Patent
1982-03-18
1983-05-17
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
204 32R, 204 34, 204 38A, 204 56R, 204 56M, 204 58, 101459, C25D 1108, C25D 1110, C25D 1116, C25D 1118
Patent
active
043838979
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. Pulsed plating may optionally be employed. 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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patent: 3804731 (1974-04-01), Yanagida et al.
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patent: 3945895 (1976-03-01), Osuga et al.
patent: 4022670 (1977-05-01), Dean
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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