Electrical contacts exposed to weather

I am wondering if somebody has developed coatings or a material that will allow you to make electrical contacts that can be exposed to the weather (humidity, rain, maybe even salty environments). I am talking about contacts of the same material so that there is no galvanic corrosion.
This is for low voltages 6V to 12V DC just for LED lights, the contacts will have a swipe action so that they get "cleaned" of rust every time they are used.

Thanks

 

Gold would work.

 

I think I forgot to say the cost should be reasonable as on consumer products.