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Testing for Iron Concentration of Passivation BathAMS 2700





July 6, 2010

Q. I am a Special Processes Manager. I am looking for testing procedures for Iron Concentration in a Passivation bath IAW 3.1.2.2 of AMS2700 [affil. link]. I am running a Type 2 Nitric Acid Bath. Any information would be helpful.
Thank You for your time.

Mike Nelson
Special Processes Manager - Chattanooga, Tennessee



simultaneous July 8, 2010

A. I would recommend ICP analysis

Terry Tomt
- Auburn, Washington



July 8, 2010

A. Hi, Mike. Flame Atomic Absorption is the way to go. If you don't have an AA, send it out to a local lab.

Jon Barrows
Jon Barrows, MSF, EHSSC
GOAD Company
supporting advertiser
Independence, Missouri
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July 19, 2010

thumbs up sign Thanks for your responses. The info was very helpful.
Q. Can the Iron Concentration be adjusted if so how?
Thanks for your time.

Mike Nelson
Aerospace Special Processing - Chattanooga, Tennessee



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July 20, 2010

A. You could also do it colorimetrically, via the 1, 10 phenanthroline method. See
<== 'Standard Methods ...'.

dave wichern
Dave Wichern
Consultant - The Bronx, New York



July 29, 2010

A. I just finished setting up a method for this in our lab using a modified method from Hach on our little spectrometer we have. The problem I ran into with the passivate II solution is the possible interference with the chromium in solution, but if you dilute it well enough, the interference is negligible.

I believe that AMS2700 [affil. link] calls out for the solution to contain less than 0.5 w/w% iron. If it gets close to this level, I suggest you just dump the bath and make a new one.

The other methods suggested are more accurate but if you have a Hach spectrometer, it is a little more cost effective.

Geronimo Cebrero
- Oxnard, California



August 2, 2010

A. Hello,
Read Letter # 39558 - very helpful.

Micheline Forth

Micheline Forth
finisher - Rincon, Georgia, USA


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