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@Lukas
Moisture in a gaseous sense, i.e. in the air or oxygen in any fluid that can exist between the two metals. Like how steel headset bearing outer races cause the same type of corrosion to the inside head tubes all the time. Gently rubbing with fine steel wool might remove it (and make the BB shell un-round by 0.0001%), but realistically looks not worth bothering with because it's so minor.
I 'reckon' it's slightly oversized (OD) circlips causing the creaking, but again I've never personally laid eyes inside a BB30 BB, so know nothing.
EDIT: is there any axial play in the circlips when installed? Can they be moved up and down slightly, or do they not budge? Maybe as an experiment for all BB30 users, someone with a spare set of circlips could grind the circlip OD down a tiny bit; just enough for there to be a bit of axial play when installed, and the see what happens after installation with copper grease. They don't need to be a mega tight/accurate fit within their own recess because all they're doing is providing a surface for the bearing to press against.