Treatment of metal parts to provide rust-inhibiting coatings by phosphating and electrophoretically depositing a siccative organic coating
AssigneeR. O. Hull & Company, Inc.
InventorsRoger A. Kelly, Howard G. Pekar
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Abstract
A method of treating metal parts to provide durable and rust-inhibiting coatings is described. The application method can be used to treat single parts or bulk barrel processing of parts. The method comprises the steps of (a) phosphating the metal parts with an aqueous metal phosphating solution, (b) electrophoretically depositing a siccative organic coating on the phosphated metal parts, and (c) applying a corrosion inhibiting film of oil as a seal coat.
Claims21
A method of treating metal parts to provide a durable rust-inhibiting coating comprising the steps of
- (a) phosphating the metal parts with an aqueous metal phosphating solution,
- (b) electrophoretically depositing a siccative organic coating on the phosphated metal parts contained in a rotatable porous barrel, and
- (c) applying a corrosion inhibiting film of oil as a seal coat.
A method of producing an adherent and rust-inhibiting finish on metal parts selected from the group consisting of ferrous metal, zinc, aluminum and alloys thereof comprising the steps of
- (a) immersing the parts in an aqueous acidic zinc, lead, iron or manganese phosphating solution for a period of time and at a temperature sufficient to deposit an adherent phosphate coating on said metal parts,
- (b) rinsing the phosphate coated parts with an aqueous acidic solution containing hexavalent chromium,
- (c) immersing the phosphate coated metal parts contained in a rotatable porous barrel in an aqueous dispersion, emulsion or solution of a thermosetting resin and passing through said part, an electric current thereby electrodepositing resin particles on the phosphate-coated parts by electrophoresis to form a resin film,
- (d) curing the resin film by subjecting the parts to a temperature of from about 120.degree.-250.degree. C. for 5 to 30 minutes,
- (e) immersing the cured resin coated parts in oil to form a top seal coat of the oil, and
- (f) drying the oil-coated parts.
Dependencies are inferred from the claim text.