Process for maintaining the zinc content in zinc phosphate baths
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United States of America Patent
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Jul 1, 1986
Grant Date -
N/A
app pub date -
Jul 2, 1985
filing date -
Jul 27, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a process for maintaining a given zinc content in nickel-containing zinc phosphate baths, (a) nickel is precipitated in a bath sample by addition of dimethylglyoxime, a soluble copper complex compound is added and the liquid is then titrated against a copper-sensitive electrode, for determining the zinc content, with a volumetric solution containing a complexing agent for zinc and copper; (b) the automatic metering of zinc-containing supplementary concentrate is then regulated on the basis of the deviation, ascertained in this way, from the given zinc content (prescribed value).
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