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Is there any sort of special conductive material that doesn't rust or cause corrosion?

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Gold ...

In applications where this is a requirement you can order gold flash over your copper. Although in reality there will be some corrosion in very harsh environments.

ENIG ...

Electroless Nickel Immersion Gold is lower cost, Nickel as a barrier, gold to protect the Nickel.

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4  
You're forgetting a few, to start with: Platinum. Depending on environment, also: Titanium, Titanium-Gold, Palladium, Palladium-Gold, even Tellurium-Copper and Phosphor-Bronze could qualify, though it may be unlikely. Specially Palladium-Gold, as in ENEPIG (or was it ENPIG?) for harsher environments and wire-bonding schemes. – Asmyldof 11 hours ago
3  
Hey buddy ! start your own answer ! (and I'll up vote it) ;) – placeholder 11 hours ago
    
Noh. Cost you votes. :-P – Asmyldof 11 hours ago
    
@Asmyldof bah. Do it. :) – hobbs 30 mins ago

There are also non-metallic conductors, including (solid) graphite and conductive polymers, (liquid) solutions of salts, and all (gas) plasmas. The liquids and gases probably don't qualify as part of the answer. Semi-conductors such as those based on silicon and germanium may qualify although they may be more susceptible to corrosion.

Note that thermal and electrical conductivity often go together. For instance, the sea of electrons causes most metals to act both as electrical and thermal conductors. However, some non-metallic materials are practical electrical conductors without being good thermal conductors.

Ref: “Conductors.” Boundless Chemistry. Boundless, 26 May. 2016.

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