Activator for use in phosphating processes

Details Activator for use in phosphating processes Activator for use in phosphating processes

1991-04-17

1992-11-03

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148262, C23C 2200

Patent

active

051605511

ABSTRACT:
The activating agent which is based on titanium(IV) phosphate and intended for use in the activation of metal surfaces before a zinc phosphating treatment contains one or more copper compounds and has a Ti:Cu weight ratio of 1:100 to 60:1 and optionally contains in addition at least one of the components consisting of condensed phosphate, silicate, complexing agent, water-soluble organic polymer, thickening agent, and surfactant. It is used to prepare aqueous activating baths for activating iron, steel, galvanized steel, zinc alloy-plated steel, aluminum-plated steel and aluminum before a zinc phosphating treatment, which baths contain 0.001 to 0.060 g/l Ti, 0.020 to 1.2 g/l orthophosphate (calculated as P.sub.2 O.sub.5), and 0.001 to 0.1 g/l Cu and so much alkali that the bath has a pH value of 7 to 11, preferably of 7.5 to 10.

REFERENCES:
patent: 2097211 (1937-10-01), Davis
patent: 2329065 (1943-09-01), Lum
patent: 3166444 (1965-01-01), Ehren
patent: 3813302 (1974-05-01), Morrison
patent: 5039362 (1991-08-01), Brands

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