I have a mix of aluminium and carbon with no corrosion issues due to occasional checks and greasing.
There are a lot of comments about full carbon completely preventing corrosion.
I am interested to know what the stainless steel screws/bolts are screwed into, surely not carbon which would still be an issue.

It's all to do with the Galvanic table, the further apart the two materials are on the table, the more one will corrode the other. Titanium and carbon (graphite) are very close so don't react, 316 stainless is good too, but aluminium alloys are way up the list so very reactive and will get eaten quickly when in close contact with carbon unless insulated with a barrier such as grease or resin.

airsail said..
... will get eaten quickly when in close contact with carbon unless insulated with a barrier such as grease or resin.

That'll be why some brands have fiberglass at the mounting point for carbon wings and aluminum fuselage.

You know you want an Armstrong the Moses stuff just corrodes
Titanium is the go with stainless bolts.