Does Cu oxidation away from contact points matter?

I'm thinking specifically of bare copper component leads. If the contact points are soldered, would oxidation along the length of the wire have any appreciable affect on performance? Wouldn't the vast majority of current be carried through the "core" of the wire (that is, everything below the oxidized surfaces)?

Showing 2 responses by eugene81

Well I've found that the latter principle is bunk due to the skin effect, but even if current is pushed to the surface of the conductor and there is a layer of essentially non-conductive oxide on the surface, wouldn't the vast majority of the current flow in the copper metal just below the layer of oxide? That is, shouldn't the wire then essentially act as a slightly thinner gauge wire where the dielectric surrounding the conductor is copper oxide instead of air?
Kijanki, that makes sense to me.

Jallen, can you explain how this "diode" effect negatively impacts performance in this context?