netneut
finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing


Finishing.com has been free for 22 years,
but without net neutrality we could soon
cease to exist. Do us a solid, click on
the banner, and contact congress today!
HomeFAQsBooksHelpWantedAdvertiseForum
topic 7614

Nickel Contamination in Methanesulfonic Tin Baths


(2001)

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)

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



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It's not possible to 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 may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.