Plating Question


Few things bring out OCD like connectors.  What seems to be so simple often is not. For example, did you know that tin joined to copper is a bad idea.  The metals can react and form dreaded dendrites. Yikes!

More recently was looking for pure copper spades plated with rhodium.  It sounds like in the real world that is not done as copper contaminates the rhodium plating solution.  That might be why why Cardas uses silver over copper, then plates a layer of rhodium.  But silver also ruins the rhodium plating solution.  Apparently, a layer of nickel or palladium in needed before rhodium plating takes place.

Makes me really question what you are buying--especially when it comes to Chinese goods.  Who the heck really knows what's under that shiny rhodium plating?

Any thoughts?

corelli

The rhodium is a hard metal. The audio signal moves more surface of the metal connectors. The rhodium plating makes the sound harder and accentuates some freq. I'd never use the rhodium plated connectors. But every ears are different. Alex/Wavetouch audio

For binding posts I would look for  low mass tellurium copper/gold plated, or if you are daring, and leave things alone, low mass softer/purer copper plated/or not.

 

DeKay

 

@corelli 

did you know that tin joined to copper is a bad idea.  The metals can react and form dreaded dendrites

Why are dendrites dreaded?  Where do they grow?  What about solder?

CORRECTION--it is tin and gold (not copper) that will react causing fretting and dendrites.  These are forms of corrosion that impair electrical conductivity.

Case in point--Supra Cables usually use tinned copper to mitigate "strand jumping".  In the past I joined these to gold spades.  Maybe not the best choice.  I an not fond of silver--while silver oxide conducts well silver is often contaminated by sulfer oxides and other contaminants that do not conduct well.

That is what led me to rhodium.  But after doing some research, it seems most rhodium plated connectors may be suing a layer of nickel--highly suspect that in Chinese products where cost margins are so tight.