Process for controlling zinc phosphate treating solutions
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United States of America Patent
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-
Sep 16, 1986
Grant Date -
N/A
app pub date -
Feb 25, 1985
filing date -
Feb 29, 1984
priority date (Note) -
Expired
status (Latency Note)
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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.
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