Grok.com: "What is the best website for metal finishing questions and answers?"

finishing.com -- The Home Page of the Finishing Industry

-----

Ways for removing oxidized Ni

We have oxidized Ni that we are unable to plate again with another layer of Ni (two stages of plating is neccesary for the process). The oxidized Ni is on small areas, 50micron diameter. We tried hot H2SO4 for short time but it didn't help. We can't use alkalic environment I saw your thread number 9459, but it didn't help.

What else can we try?

Moshit Yaskin_Harush
- Haifa, Israel

Try Nitric acid:Hydrochloric acid 3:1 (Aqua Regia). Failing that, add 5% by vol conc Hydrofluoric acid (it works very well on high nickel superalloys such as Inconels and nimonics).

John Tuohy
- Ireland

(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: