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

HomeFAQsBooksHelpWantedAdvertiseForum
(current
topics)
topic 4769

Silver plating on electrical contact springs.


(2000)

I have been cycle testing spring probes used in circuit board testers to determine the best and longest lasting type of plating to be used on the spring itself.

So far, silver plate over a copper strike, on a spring wound from music wire ASTM 228 seems to give the best results. The silver springs even outlast raw unplated ones. I believe this is due to the lubricating properties of the silver, and it's malleability. Previously, we were plating gold over electroless and/or sulfamate nickel, and having problems with premature spring failure. I have two questions. One: does anyone know what the conductivity of silver sulphide (tarnish) is? And secondly: can anyone give any reason why not to plate these springs with silver.

Thanks to all for your input.

Brian A. Jones
Test Connections Inc. - Upland, Ca U.S.A.


(2000)

Hey Brian,

Silver should be fine to use as the plate and if you are getting the spring cycles you may not need to bake the parts after electroplating. Silver will form a very light chromate film (will pass current) if you just want more protection or if you need to bake and then need to snap the surface back.

Sorry, don't know the conductivity of the sulphide, but its not much of a conductor. 3M makes some protective papers that can be placed along with the parts in good packaging (sealed plastic bag 4 mils thick or more) and will increase the shelf life. Gold over the silver would also work (silver will, with time, come to the surface of the gold so you may need more than a flash).

Regards,

Fred Mueller, CEF
Wendt Dunnington - Royersford, Pennsylvania


(2006)

We have a problem with heavy tarnish on silver-plated spring contacts which are difficult to reach and impossible to abrade. Is there a chemical treatment which will reduce the silver sulphide to metallic silver? Would heating work?

Help?

Dr. Terry Rowe
- Elliot Lake, ON, Canada



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 CURRENT 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.