| Search our quarter-million Q&As |
Home of the finishing HOTLINE since 1989
-----Nitric acid analysis in chromating solution
Q. Hello to all,
can any one please give me the method for analysis of Nitric acid (65% ) in yellow chromating solution we are facing a big problem in maintaining the nitric acid in yellow chromating solution as we are new to this process
Thank you.
plater - Bangalore, India
May 28, 2010
The OEM for the chromating solution will be happy to provide that information. If you have a home brew, then you will have a problem establishing a value to test to as the tank solution ages.
James Watts- Navarre, Florida
A. 1. 5 mL sample of bath in a 250 mL Erlenmeyer flask
[affil link].
2. 75 mL deionized water
[affil link].
3. 5 drops phenolphthalein
⇦ on
eBay &
Amazon [affil link]
indicator.
4. titrate against 1.0N sodium hydroxide 1N
[affil link] solution. color change will be pale orange to dark pink-red.
v/v% HNO3 = mL 1.0N NaOH x 1.43
Randall Fowler - Fowler Industrial Plating, LLC
Cleveland, Tennessee, USA
A. I believe you can do this testing through an automated thermotitration. It easy and very accurate.
Tony Paulin- Bardstown, Kentucky, USA
February 27, 2011
Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.