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

-----

Acid rinse after Nickel and Acid copper

Do we need to put sulfuric acid 5-7% rinse after Nickel and Acid copper, although these baths are acidic in nature,I feel by doing this we are only increasing the carry over TDS from this acid rinse and creating trouble in recycling water and Zero discharge. Experts please comment.

Panjala Mukesh
fashion jewelry mfgr.
Hyderabad, India
2005

2005

Dear Panjala,

It is not necessary to put sulfuric acid into the rinse water step. I do not know how are the waste water regulations in India, but here in Europe we have a strong regulation concerning the amount of sulphate in the waste water. With 5-7% sulfuric acid in your rinses you will rapidly increase your content of sulphate in your waste water, which is difficult to reduce.

Regards,

Dominik Michalek
- Mexico City, Mexico

(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: