Process for producing iron phosphate coatings at ambient tempera

Details Process for producing iron phosphate coatings at ambient tempera Process for producing iron phosphate coatings at ambient tempera

1980-03-24

1981-11-03

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 617, C23F 710

Patent

active

042984050

ABSTRACT:
This invention relates to a process and composition for producing an iron phosphate conversion coating on a ferrous metal surface at ambient temperatures of from about 50.degree. F. to about 100.degree. F. The ferrous metal surface is contacted with an aqueous acidic phosphating solution having a pH within the range of 3 to 6 and consisting essentially of orthophosphate ions at a concentration of at least about 2.0 grams per liter and an ambient temperature activator comprising nitrite ions at a concentration of at least 0.08 grams per liter.

REFERENCES:
patent: 2609308 (1952-09-01), Gibson
patent: 3127288 (1964-03-01), Hines et al.
patent: 3129123 (1964-04-01), Rodzewich
patent: 4140551 (1979-02-01), Jones

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