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Iron Test for Passivation Bath

Hi,
I'm looking for some help with an iron test to determine if my passivation bath needs to be changed.
We are starting a passivation line and this seems to be the only test I can't get my hands on.
I would appreciate anyone's help.

Thank-you,

Micheline Forth
metal finishing - Savannah, Georgia, USA
2006

You may have already thought of it, but an amazing amount of topics have been covered repeatedly over the years at this website and all of that information is still available in the archived letters. Use the search engine to see if your question has already been answered, and give special attention to letters 57140 and 36868 - my notes indicate that these two might have the answer your looking for.

Good luck.

Jim Gorsich
Compton, California, USA
2006

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