Data point: Volvo 240s used aluminum rear bumpers bolted to steel brackets with steel bolts. I had one of them in a state that used lots of road salt. It did eventually suffer from galvanic corrosion, to the point that it became brittle around the brackets and fractured. However, that was in a situation where it was drenched in salt water for half the year, and it took about 15 years and a couple taps from parking-by-braille incidents for a problem to show up.
I've had lots of cars with aluminum engine blocks with all kinds of steel hardware bolted to them, though, with no corrosion issues. Depending on how wet the area is it might be fine.
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N8SRE
1990 E-250 Sportsmobile w/ penthouse top, converted when new by SMB Texas.
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