Letter 146

Do concentrations in phosphating baths decline with use?

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Phosphate concentrations in iron and zinc phosphate baths I am interested in the phosphate concentrations of iron and zinc phosphate baths. I am under the impression that the phosphorous is consumed so that there would be a range from a fresh bath to the time it is discarded. Am I right? Any help would be appreciated

Tom Mort -

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Dear Tom, The components of both Iron and Zinc Phosphate baths are consumed fairly evenly while processing. Chemical replenishment (ie Additions) replace the consumed components. In most cases Iron baths are discarded only to remove mud & particulate sludge, in most cases with proper filtration, Iron Phos. baths do not require dumping. Zinc Phosphate baths which contain soluble iron are discarded to remove High soluble iron contaminant and by-product sludge. Zinc phosphate baths that operate on the "Zero-Iron" side can be maintained much like an Iron Phos bath. Simply filter or remove sludge and try not to discard. I hope this information proves useful.

Dick Sarlund

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