Process for controlling zinc phosphate treating solutions

Details Process for controlling zinc phosphate treating solutions Process for controlling zinc phosphate treating solutions

1985-02-25

1986-09-16

Silverberg, Sam

Metal treatment

Compositions

Heat treating

C23C 2212

Patent

active

046120602

ABSTRACT:
A process for controlling the zinc or zinc and nickel content of a zinc phosphate conversion coating solution employs the addition of EDTA and titration with calcium ion using a calcium ion electrode. Preferably to a second sample is added EDTA and a thioglycolate and the same titration conducted to obtain the concentration of nickel ion for direct control purposes.

REFERENCES:
patent: 4182638 (1980-01-01), Cooke
patent: 4515643 (1985-05-01), Knaster

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