Method of analyzing the complexing power of a pickling liquor
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United States of America Patent
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-
Feb 15, 1994
Grant Date -
N/A
app pub date -
Aug 1, 1991
filing date -
Aug 1, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method is provided for accurately determining the complexing capacity (or free HF concentration) of a pickling liquor. A sample of pickling liquor is obtained and an excess of ferric ion is added thereto to complex with all of the free HF in the sample. A back titration is performed to determine the residual free ferric ion. The difference between the amount of ferric ion added and that found by the titration is related to the free HF in the original sample. The method is useful in conjunction with an automated, on-line system which periodically monitors a pickling bath and makes any necessary adjustments thereto.
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