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AssigneeThe United States of America as represented by the United States Department of Energy
InventorsToshifumi Sugama, Lawrence E. Kukacka, Neal R. Carciello
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This invention relates to a precoat, laminate, and method for ductile coatings on steel and non-ferrous metals which comprises applying a zinc phosphating coating solution modified by a solid polyelectrolyte selected from polyacrylic acid (PAA), polymethacrylic acid (PMA), polyitaconic acid (PIA), and poly-L-glutamic acid. The contacting of the resin with the phosphating solution is made for a period of up to 20 hours at about 80.degree. C. The polyelectrolyte or the precoat is present in about 0.5-5.0% by weight of the total precoat composition and after application, the precoat base is dried for up to 5 hours at about 150.degree. C. to desiccate. Also, a laminate may be formed where polyurethane (PU) is applied as an elastomeric topcoating or polyfuran resin is applied as a glassy topcoating. It has been found that the use of PAA at a molecular weight of about 2.times.10.sup.5 gave improved ductility modulus effect.
A metal lamina consisting of a steel and non ferrous metal base and a precoat polymer layer consisting of a zinc phosphating layer modified by a polymer coating of about 20A-40A thickness of a polyelectrolyte selected from the group consisting of polyacrylic acid, polymethacrylic acid, polyitaconic acid, and poly-L-glutamic acid, said precoat polymer layer was applied from a zinc phosphate and polyelectrolyte composition wherein the polyelectrolyte is present in about 0.5-5% by weight and has a molecular weight of about 10,000-300,000.
A laminate consisting of a metal base, a precoat polymer layer consisting of a zinc phosphating layer modified by a polymer coating of about 20.ANG.-40.ANG. thickness of a polyelectrolyte selected from the group consisting of polyacrylic acid, polymethacrylic acid, polyitaconic acid, and poly-L-glutamic acid, and a polymeric top coating, said precoat polymer layer was applied from a zinc phosphate and polyelectrolyte composition wherein the polyelectrolyte is present in about 0.5-5% by weight and has a molecular weight of about 10,000-300,000.
A method of coating a steel or non-ferrous base which comprises contacting said base with a precoat consisting of an aqueous treating agent of a zinc phosphate solution modified by a polyelectrolyte having a molecular weight of about 10,000-300,000 and a concentration of about 0.5-5% by weight wherein the said polyelectrolyte is selected from polyacrylic acid, polymethacrylic acid, polyitaconic acid, and poly-L-glutamic acid wherein said contacting is made up to 20 hours at a temperature of 60.degree.-80.degree. C. and where said precoat base is dried for at least 15 minutes at about 150.degree. C. thereby producing a polyelectrolyte coating in a thickness of about 20.ANG.-40.ANG..
Dependencies are inferred from the claim text.