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

-----

Stripping of PVD plated gold

July 15, 2009

We do Gold plating through PVD process with titanium nitride on PNP and Ni under coat on brass. We use cyanide base stripper for stripping 0.1 micron of PVD plated gold layer. Any other method is there for stripping gold without cyanide ?

Pl give your views.

regards,

Rama Subramanian
supervisor -Plating - India

Hello Subramanyam
PVD gold coating can be stripped by aqua regia (3HCL+1 HNO3) .If the solution can be heated up to 100 °C it will more effective.
Thanks
M.C. Mahanta
orissa INDIA

MUKUNDA CHARAN
- KEONJHAR,ORISSA, India
September 4, 2009

October 13, 2009

Be careful with an aqua regia dip. The Nitric acid (HNO3) in there will try and attack the copper as well as the gold.
Another gold etchant is a solution of potassium iodide (115g), iodine (65g), and water(100mL). This will attack the gold extremely rapidly so you may want to try 5 second intervals or diluting it. Play around with it and you'll be able to optimize it for your process.

Regards,

Dave Lewis
plating engineer - Columbus, Ohio, USA

(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: