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Zinc phosphate conversion coatings

United States Patent

5,604,040
February 18, 1997
View the Complete Patent at the US Patent & Trademark Office
Brookhaven National Laboratory - Visit the Office of Technology Commercialization and Partnerships Website
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.
Sugama; Toshifumi (Wading River, NY)
Associated Universities, Inc. (Washington, DC)
08/ 565,902
December 1, 1995
This invention was made with Government support under contract number DE-ACO2-76CH00016, between the U.S. Department of Energy and Associated Universities, Inc. The Government may have certain rights in the invention .