Electrochemically treated metal plates

Chemistry: electrical and wave energy – Processes and products

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Details

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.

REFERENCES:
patent: 2578400 (1951-12-01), Cohn
patent: 2918416 (1959-12-01), Taylor
patent: 3275537 (1966-09-01), Petin
patent: 3307951 (1967-03-01), Adams
patent: 3620939 (1971-11-01), Fruchtnicht
patent: 3756826 (1973-09-01), Zelley
patent: 3844908 (1974-10-01), Matsuo et al.
patent: 3857766 (1974-12-01), Woods
patent: 4153461 (1979-05-01), Berghauser

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