netneut  battle1
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 12481

Copper Migration through Ni and Au surface under high humidity


 

Copper migration mechanism:

I would like to understand more about copper migration (corrosion).

The problem I am facing is that the coaxial connector body which is made of BeCU (beryllium copper) and plated with 30-70 micro inch of Ni. On top of Ni, there is 30-50 micro inches of Au. However when subjected to high humidity such as 70 to 85 %RH, the surface start to see the brownish spots. This is very ugly. Please tell me how to solve this problem.

Max Teh
- Sonoma, California, USA


 

This is not some fancy copper migration phenomena, it's plain old corrosion because the plating is so thin that it's porous. Increase the nickel thickness by a factor of 10 or so then let us know what happens :-) Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey


 

While a factor of 10 I am sure will eliminate the problem, a thickness of 150 you in. should be sufficient. I have seen this problem before as many customers want to keep the nickel thickness to a minimum when the parts will be subsequently formed or bent, otherwise the nickel will crack. the best solution is to plate the part after forming if it is possible.

Richard Breslin
Starflex, Inc - Lowell, Massachusetts



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.