Metal treatment – Compositions – Heat treating
Patent
1973-11-21
1976-06-08
Kendall, Ralph S.
Metal treatment
Compositions
Heat treating
106 14, C23F 710
Patent
active
039619915
ABSTRACT:
A method for chemical treatment of the surface of an iron substrate which comprises (a) treating the surface with an aqueous solution containing phosphoric acid in a concentration of 0.5 to 80 weight/volume %, (b) subjecting the surface without water rinsing to treatment with an aqueous solution containing phosphoric acid with a substance capable of reacting with the phosphoric acid to give a water-soluble salt, which is hydrolyzed and/or reacted with the iron substrate to form a volatile base, and/or a substance capable of reacting with the phosphoric acid to give a water-soluble salt, which is hydrolyzed and/or reacted with the iron substrate to form a non-volatile base, the pH of the aqueous solution being 1 to 9, the total ion concentration being 0.2 to 8 weight/volume % and the concentration of the cation from the latter substance being not more than 0.5 weight/volume %, and (c) drying the surface without water rinsing.
REFERENCES:
patent: 2490062 (1949-12-01), Jernstedt
patent: 3460989 (1969-08-01), Rusch
patent: 3493440 (1970-02-01), Ashdown
patent: 3615912 (1971-10-01), DiHel et al.
Takagi Akio
Yoshida Yuichi
Kendall Ralph S.
Nippon Paint Co. Ltd.
Smith John D.
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