Process for the production of sprayed phosphate coats on iron an

Details Process for the production of sprayed phosphate coats on iron an Process for the production of sprayed phosphate coats on iron an

1975-04-02

1977-01-18

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 615Z, 106 14, 252389A, C23F 708

Patent

active

040037614

ABSTRACT:
In the process for applying a phosphate coating to a ferric surface which comprises spraying an aqueous acidic solution at a pH of 4.3 to 6.5 containing an orthophosphate salt of a cation selected from the group consisting of alkali metals and ammonium, in the presence of oxidizing agent or reducing agent accelerators onto said surface, the improvement consisting of adding to said aqueous acidic solution from 0.05 to 1 gm per liter of a short-chain alkylolamine having from 2 to 4 carbon atoms in each alkylol and from 0.01 to 1.5 gm per liter of at least one non-ionic surface-active wetting agent.

REFERENCES:
patent: 2250508 (1941-07-01), Thompson et al.
patent: 2657156 (1953-10-01), Hyams et al.
patent: 2744555 (1956-05-01), Nicholson et al.
patent: 2987428 (1961-06-01), Heller et al.
patent: 3166444 (1965-01-01), Ehren et al.
patent: 3368913 (1968-02-01), Zehr et al.
patent: 3484304 (1969-12-01), Beach
patent: 3660127 (1972-05-01), Aronberg
patent: 3764353 (1973-10-01), Shimiyu

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