Breathe easy! No registration or passwords; no maddening pop-up or floating ads :-)

Where the world gathers for
plating, anodizing, & finishing Q&As since 1989

-----

CONTROL OF RESIDUAL PHOSPHATE

December 5, 2008

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 6, 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

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: