No registration, no passwords; no pop-up ads -- just aloha, fun, & authoritative answers.
As an eBay Partner & Amazon Affiliate we receive compensation for qualifying purchases.
Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site
pub  Where the world gathers for
plating, anodizing, & finishing Q&As since 1989





-----

Nickel Contamination in Methanesulfonic Tin Baths





Hello folks,

I am working in the electronics industry, specifically with multilayer ceramic capacitors. We plate nickel and tin onto silver termination. My main problem is that my methanesulfonic tin baths get nickel metal contamination to a 1000 ppm levels, which it is not acceptable. I have been dummy plating at low current densities to reduce the nickel level, but I plate out at the same time the tin from the bath. Is there anything else to reduce or eliminate the nickel from the tin baths besides: electrolytic removal(dummy plating), adding more DI-Water rinses in the line or making new baths?

Thanks.

Reynaldo Arroyo
-Valencia, CA, U.S.A.
2001



2001

Reynaldo, I think you have two problems, one is that you have a Sn bath that is contaminated above acceptable Ni contamination levels, and the other is that Ni is getting into your Sn bath. For reducing the Ni, dummy plating and/or diluting are probably your two options. However, I would be focusing on prevention.

You did not mention if you are barrel plating or using RFT's. If it's barrel plating I can assure you that with adequate rinsing, drip times and a Sn predip you will not see the Ni contamination increase in your Sn bath. If you are using RFT's there are other issues that we need to discuss.

Rich Reifenheiser
- Monterrey, Nuevo Leon, 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:

 
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"