Metal treatment – Compositions – Heat treating
Patent
1985-11-05
1987-04-21
Silverberg, Sam
Metal treatment
Compositions
Heat treating
148400, C23C 2217
Patent
active
046593950
ABSTRACT:
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.
REFERENCES:
patent: 3169039 (1965-07-01), Herbst
patent: 3941562 (1976-03-01), Hollingshad
patent: 4052232 (1976-10-01), Brock et al.
patent: 4163702 (1979-08-01), Richert
patent: 4215035 (1980-07-01), Memering
patent: 4368139 (1983-01-01), Pollock
patent: 4427459 (1984-01-01), Goltz
Carciello Neal R.
Kukacka Lawrence E.
Sugama Toshifumi
Bogosian Margaret C.
Hightower Judson R.
Silverberg Sam
The United States of America as represented by the United States
Weinberger James W.
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