Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

Precipitation of chrome from a passivate

What is the best way to precipitate chrome (III) from a spent passivate solution. pH correction doesn't seem to do much. There is a level of citric acid added to the bath during it's life - I'm sure this is not helping.

Paul Beel
- Durham, UK

Paul:

You may have to bring the pH up to 12 with Ca(OH)2. This should drop out all of the citric as Calcium citrate and free up the chromium for precipitation using normal methods.

Lee Kremer
Stellar Solutions, Inc.

McHenry, Illinois

(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: