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





-----

Plating Nickel over silver


I use a nickel sulfamate bath to plate approximately 250 µ" of nickel onto a silver epoxy termination of an electronic component. The terminations are then dipped into a tin/lead solder pot (Temp=230° C). 95% of the time, the nickel covers the silver terminations completely , however, approximately 5% of the time I will have "spots" on the terminations that do not nickel plate. I believe the "spots" are due to the resin in the silver epoxy coming to the surface of the silver and not allowing this "spot" to plate. I surmise this because if I abrade the spot it will plate. If this is true, is there a way to treat the surface of the silver (without abrading) before nickel plating to solve this issue? Or, have I missed the issue altogether and there is something I am not seeing/doing during this plating process?

56709

The component is next to a scale with 1/64 graduations to give you an idea of the size of the part and of the area that did not nickel plate and subsequently did not wet with solder (The picture is of a termination that has been dipped in hot tin/lead solder). The "circle" (approx: 5/64") is the base layer of silver. A much smaller non-plated area can also be seen on the termination.

Dan Johnson
Electronic component Manufacturer - Sanford, Maine, USA
February 14, 2011




(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"