Coating processes – With post-treatment of coating or coating material – Coating material recirculation or regeneration
Patent
1977-12-30
1980-10-21
Smith, John D.
Coating processes
With post-treatment of coating or coating material
Coating material recirculation or regeneration
427352, 427435, B05D 140, B05D 118
Patent
active
042294924
ABSTRACT:
An autodepositing coating process wherein a coating bath containing an acidic aqueous coating composition comprising as essential ingredients: (1) an acid; (2) an oxidizing agent; and (3) an aqueous dispersion of coating forming resin particles and surfactant, which surfactant is subject to being slowly altered by the acidic oxidizing environment in the metal coating bath resulting in the buildup of reaction products in the bath, which bath is maintained in continuous coating forming operability by replenishing in a manner which prevents the deterioration of the coating quality of the bath. The coating composition and replenishing composition may also contain as an optional ingredient an aqueous dispersion of pigment and surfactant and may also contain non-essential ingredients, which non-essential ingredients may increase in concentration as the bath is operated until a deleterious effect is asserted on the coating formation. The coating quality of the replenished bath is maintained by the addition of an aqueous surfactant composition and by operating the replenished bath at an elevated redox potential or by removal of the altered surfactant.
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Industrial Finishing Magazine, Mar. 1977, pp. 39-43, Cathodic Electrocoating Tank.
Donovan Joseph C.
Hall Wilbur S.
Leister Harry M.
Amchem Products Inc.
Bueker Richard
Smith John D.
Szoke Ernest G.
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