Home /
Search 🔍
the Site
pub Where the world gathers for
plating, anodizing, & finishing Q&As since 1989


Rhodium Plated electrical contacts get spots (burns?)

December 15, 2011

Q. I'm experiencing issues with getting a decent electrical connection between two Rhodium plated components (~3V). One component is a pin (Al w/ Rhodium plate per MIL--R-46085B, Class 1, 0.000002" thick) and the other is a leaf spring (Phosphor Bronze w/ Rhodium plate per MIL-R-46085, class 3, 0.000002" thick). Over time, a small, black spot appears where the two contacts come together. Because there is no sliding/scrubbing between these contacts, the black spot must be removed more frequently than our customer specs allow (Dremel tool + polishing compound). These parts need to maintain electrical contact in both vacuum and atmospheric environments. They are typically in a clean room, so environmental contamination and temperature swings are not a major concern or contributing factor.

Has anybody experienced similar issues with non-sliding Rhodium plated contacts? If so, I'd like to hear about any solutions I might be able to leverage. I read in t

Can anybody suggest an alternate plating that is better suited to this application? I can freely change the leaf spring materials, but changing the pin is not an option at this point I'm afraid.

Many thanks in advance!

Paul Keady
- Hillsboro, Oregon, USA

finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

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:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2023 finishing.com, Pine Beach, New Jersey, USA