Electrocoating process for depositing a corrosion retardant laye

Details Electrocoating process for depositing a corrosion retardant laye Electrocoating process for depositing a corrosion retardant laye

1974-10-01

1976-05-04

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

C25D 1306, C25D 1318

Patent

active

039545881

ABSTRACT:
An improved electrocoating process in which a metal substrate is first coated with an anionic layer, for example, anions of an acidic material such as phosphoric acid or chromic acid are used, the anions combine with the metal to form a corrosion retardant layer and then the substrate is electrocoated with a cationic film-forming polymer and dried to form a continuous film.
An aqueous electrocoating composition of an acrylic cationic film-forming polymer reacted with an acid material also is a part of this invention.

REFERENCES:
patent: 3497440 (1970-02-01), Weigel
patent: 3882009 (1975-05-01), Wagener et al.

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