No registration or passwords; no pop-up ads -- just aloha, fun, & answers.
(as an eBay Partner & Amazon Affiliate earns from qualifying purchases).
Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Advertise
 
Help
Wanted
Current
Q&A's
Site 🔍
Search
pub  Where the
world gathers for metal finishing
Q&As since 1989



-----

Leaching stains in Nickel Plating on Tin/Lead Medals




2007

We Have a customer manufacturing, amongst other things, medals for competitions. The medals are made from tin/lead. We are however having problems with leaching on the rear of the medals only, appearing after Nickel Plating. The leaching is bluish in colour and I suspect it could be acid.

Nickel is the final Plate. We activate the product for 1 minute in a 5% strength acid dip prior to a cyanide copper strike, pyro copper build and into Nickel bath.

We have tried adding in hot and cold water rinses before and after the acid, and a hot and cold water rinse prior to drying them in an oven. We have also tried substituting the Copper strike with a Brass strike.

I would be very grateful for recommendations.

Mike Campbell
Plating Shop Employee - New Zealand



Seems to me you've tried hot and cold rinsing everywhere but where it now seems to be needed, Mike -- after the cyanide plating :-)

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2007




(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:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact  -  Privacy Policy  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"