Process for activating steel surface prior to phosphating treatm

Details Process for activating steel surface prior to phosphating treatm Process for activating steel surface prior to phosphating treatm

1984-08-06

1985-05-14

Silverberg, Sam

Metal treatment

Compositions

Heat treating

148 615Z, C23F 710

Patent

active

045170304

ABSTRACT:
This invention discloses a process for activating steel surface prior to phosphating treatment wherein the steel surface is cleaned, the cleaned steel surface is then treated with an aqueous activating solution containing titanium and pyrophosphate ion, and thereafter the steel surface is treated with a phosphating solution, characterized in that magnesium ion is included in said aqueous activating solution in order to suppress formation of an inactive film on said steel surface due to the presence of said pyrophosphate ion, and then said steel surface is treated with the resulting aqueous activating solution.

REFERENCES:
patent: 3741747 (1973-06-01), Hamilton
patent: 3864139 (1975-02-01), Heller
patent: 4152176 (1979-05-01), Guhder

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