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Zinc phosphate conversion coatings

Patent ·
OSTI ID:870839
Zinc phosphate conversion coatings for producing metals which exhibit enhanced corrosion prevention characteristics are prepared by the addition of a transition-metal-compound promoter comprising a manganese, iron, cobalt, nickel, or copper compound and an electrolyte such as polyacrylic acid, polymethacrylic acid, polyitaconic acid and poly-L-glutamic acid to a phosphating solution. These coatings are further improved by the incorporation of Fe ions. Thermal treatment of zinc phosphate coatings to generate .alpha.-phase anhydrous zinc phosphate improves the corrosion prevention qualities of the resulting coated metal.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY
DOE Contract Number:
AC02-76CH00016
Assignee:
Associated Universities, Inc. (Washington, DC)
Patent Number(s):
US 5604040
OSTI ID:
870839
Country of Publication:
United States
Language:
English

References (11)

Effect of Alkali Metal Hydroxides on the Dissolution Behavior of a Zinc Phosphate Conversion Coating on Steel and Pertinence to Cathodic Delamination journal November 1987
Chemisorption mechanism and effect of polyacrylic acid on the improvement in bond durability of zinc phosphate-to-polymer adhesive joints journal February 1987
Advanced poly(acrylic)acid-modified zinc phosphate conversion coatings: use of cobalt and nickel cations journal February 1992
Cobalt and Nickel Cations as Corrosion Inhibitors for Galvanized Steel journal February 1981
Aspects of the adhesion and corrosion resistance of polyelectrolyte-chemisorbed zinc phosphate conversion coatings journal January 1988
Influence of the high temperature treatment of zinc phosphate conversion coatings on the corrosion protection of steel journal January 1991
Fundametal Characteristics of Zinc Phosphate Coating [リン酸亜鉛皮膜の基本的性質] journal January 1980
Corrosion protection of steel and bond durability at polyphenylene sulfide-to-anhydrous zinc phosphate interfaces journal July 1992
Nature of interfacial interaction mechanisms between polyacrylic acid macromolecules and oxide metal surfaces journal December 1984
Characteristics of Transition Metal-Adsorbed Anhydrous zinc Phosphate Coatings as Corrosion Barriers for Steels journal January 1991
Phenylene sulfide polymers. III. The synthesis of linear polyphenylene sulfide journal April 1962