Yeah, the traces on circuit boards are copper so an application of flux or even a bit of abrasion will take care of the oxidation... I know that solid aluminum is far more difficult to solder using these tools.
I once repaired a tuning peg on a guitar by replacing the broken plastic tab using a nickel (5 cents). I just hacksawed a notch on the peg enough to stick the coin in it, then just melted a bunch of solder into the gaps. I don't even remember putting any flux, and I'm not sure if it would have done anything. Perhaps the nickel coating doesn't have problems with oxidation. Anyway, it worked; the connection was solid.
It would be cool if I can get 4.5Ghz stable once this solution is in place.
i7-5820K@3.8, 64GB, X99 Sabertooth, 1080Ti, 1TB Samsung 960PRO
Xeon 12core ES@2.7, 64GB, X99-P SLI, 980Ti, Vega 56
MBP15 2017 touch bar (i7-7820HQ) Radeon 560, 16/512GB
MBP15 2015 (i7-4870HQ) R9 M370X, 16/512 (FS!)
MB12 2017 (i7-7Y75@1.4) 16/512