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CONTROL OF RESIDUAL PHOSPHATE

I'M LOOKING FOR A CHEMICAL AND ISTANTANEOUS METHOD TO VERIFY THE PRESENCE OF RESIDUAL PHOSPHATE ON FASTENERS AFTER THE DE-PHOSPHATING WASH PRE-HEAT TREATMENT.

MAURIZIO PIVI
EMPLOYED IN A FASTENERS FACTORY - BUTTIGLIERA ALTA-TO- ITALY
December 5, 2008

Dissolve 5 g ammonium molybdate in 50mL distilled water and 18 mL concentrated nitric acid. This solution will turn phosphate coated surfaces a greenish-blue.

Terry Lycans
Aerospace - Dayton, Ohio, USA
December 6, 2008

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