Method of monitoring constituents in conversion coating baths
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United States of America Patent
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May 19, 1998
Grant Date -
N/A
app pub date -
Aug 1, 1996
filing date -
Aug 1, 1996
priority date (Note) -
Expired
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Abstract
A method for monitoring the constituents present in conversion coating bath solutions. The method involves using specific ac and dc voltammetry and using platinum or other noble metal working electrodes. First, a selected dc potential is applied to a working electrode which has been subjected to pretreatment and which is present as an in-tank sensor in the bath being analyzed. A constant ac signal is superimposed on the dc potential. The dc potential is then swept over a chosen range at a selected sweep rate. The various constituents in the bath are then monitored by measuring dc current and the ac current at one or more reference phase angles with respect to the constant ac signal between the working electrode and a reference electrode as the dc potential is varied. The resulting dc and ac spectra provide a useful measurement of the make-up of the constituents in the bath solutions.
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