Process for desludging phosphating baths and device for carrying out said process
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United States of America Patent
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Nov 6, 1990
Grant Date -
N/A
app pub date -
Dec 13, 1988
filing date -
Dec 16, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The development of sludge in phosphating baths is prevented by continuously diverting a partial volume of the baths into a separate device comprising three open chambers: an oxidation chamber where the solution is treated with an O.sub.2 -containing gas to oxidize the iron (II) of the solution of iron (III), which precipitates as phosphate; a conditioning chamber in which the iron (iii) phosphate precipitate formed in the oxidation chamber is agglomerated into a readily sedimented form; and a sedimentation chamber in which the sediment formed in the conditioning chamber is separated from the remaining liquid phosphating solution. This solution is then replenished with phosphate layer-forming components, and the replenished solution is subsequently recycled to the phosphating bath.
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