Home /
Search 🔍
the Site

Free personalized metal finishing help!

Iron titration for acid pickle bath

(-----) 2006

What method would be usable to obtain an iron concentration via iron titration methodology?
What would an acceptable range for iron concentration in this bath be considering it's a 1000 gallon tank? what level would need to be time for a tank dump? I am new to system and previous employees did not keep any records so any help would be appreciated.. thanks

Sue Kufahl
pretreatment and painting company - Berlin, Wisconsin


Sue -

A common titration for Fe+3 is a redox titration with sodium thiosulfate. You should be able to find details on the web or in a Chem textbook. It's important that Fe+3 be the only oxidizing agent in the bath however or you will get errors.

Consult your company internal specifications for guidelines on the concentration needed to maintain.

As far as tank life goes, you may have to run some experiments to determine that.

Terry Tomt
- Auburn, Washington


And, Fe(+2) is commonly titrated with an oxidizer such as potassium dichromate or potassium permanganate.
What acid solution are you using, does it become yellow or green or ? To what pH do you titrate for acid, and does a rusty (red-brown) precipitate form? If so, the calculated acidity will be high, as some NaOH is consumed via Fe(OH)3 formation. An specific gravity data?
Please give info, and note some previous letters (from using the Search function):

www.finishing.com/60/76.shtml Titration for iron in sulfuric acid needed
www.finishing.com/327/77.shtml Sulfuric acid titration indicator
www.finishing.com/267/67.shtml Analysis for Ferric Sulphate
www.finishing.com/138/62.shtml IRON CONTENT IN HCl PICKLING
www.finishing.com/106/43.shtml How to analyze the acid level (HCL) in Ferric Chloride Solution
www.finishing.com/362/86.shtml Ferric chloride testing
www.finishing.com/137/54.shtml [read the answer only]

Ken Vlach [dec]
- Goleta, California

contributor of the year Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.


finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

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:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2022 finishing.com, Pine Beach, New Jersey, USA