Passivating metal surfaces

Details Passivating metal surfaces Passivating metal surfaces

1976-03-15

1977-08-30

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 615R, 134 27, 134 41, 252394, 252389A, 21 27R, C23F 902

Patent

active

040452530

ABSTRACT:
A method for passivating acid-cleaned ferrous metal surfaces is disclosed. The method features the use of an aqueous passivating solution having a pH of greater than about 8, comprising a base, an oxygen containing gas, and one of hydrazine, an iron complexing agent and mixtures thereof, wherein the method comprises contacting an acid-cleaned ferrous metal surface with the passivating solution at temperatures up to about 400.degree. F or greater.

REFERENCES:
patent: 3067070 (1962-12-01), Loucks
patent: 3132975 (1964-05-01), Freud
patent: 3257160 (1966-06-01), Zimmermann et al.
patent: 3272738 (1966-09-01), Pitzer et al.
patent: 3415692 (1968-12-01), Armentano
patent: 3447965 (1969-06-01), Teumac
patent: 3460989 (1969-08-01), Rusch
patent: 3677827 (1972-07-01), Weaver
patent: 3783035 (1974-01-01), Elsenlohr et al.
patent: 3901651 (1975-08-01), Benner

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