I've noticed that my brake discs are a light orange color from oxidation. It's a minor detail, but it detracts from the clean look of the wheels. Is this normal? Is there anything that can be done about it?
This is true. However, over time the areas of your rotors that do not come in contact with the pads will show this rust too. That rust, of course, does not get worn away with driving. Again, doesn't hurt anything but looks horrible.The zinc coating will sacrifice itself to protect the iron rotor material that it covers from rusting for as long as the zinc remains. However, zinc being relatively soft will get worn off of the rotor braking faces by the brake pads. As the others have said, don't worry about the 'flash rust', it's normal.