It is just flash surface rust. Next time you have the wheels off wipe the studs and nuts down with some water displacement type light lube. "Dry" bike chain lube is real good. Don't spray directly, spray or wet a rag and wipe them down.
Graphite has 0 ability to resist water and prevent rust. it is slippery sheets of carbon, messy but just the ticket for some things. might not be my first reach for studs.
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