Metal treatment – Compositions – Heat treating
Patent
1974-09-27
1976-12-28
Kendall, Ralph S.
Metal treatment
Compositions
Heat treating
148 615Z, 106 14, 252389A, C23F 710
Patent
active
040000125
ABSTRACT:
The corrosion protecting action of iron phosphate or zinc phosphate coatings on mild steel is markedly raised by treating with solutions of .alpha.-aminophosphonic or -phosphonous acids or their water soluble salts. Compounds having more than one amino and more than one phosphonic or phosphonous acid groups are also suitable. Paint films on metal surfaces pretreated in this manner show a considerably better adhesion than on untreated surfaces.
REFERENCES:
patent: 3200004 (1965-08-01), Herbst et al.
patent: 3202534 (1965-08-01), Duch et al.
patent: 3483133 (1969-12-01), Hatch et al.
patent: 3634146 (1972-01-01), Wystrach et al.
B265,369, Jan. 1975, Harris et al., 106/14.
Burrows John
Hargreaves James Roger
Miles Peter
Ciba-Geigy Corporation
Kendall Ralph S.
Vanecek Charles W.
Wolfe, Jr. Charles R.
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