I understand galvanic corrosion and the chemistry which causes the reaction. But under what circumstances can they be in contact?
On first impression I would think they could in a dry environment... but that's a tough definition to follow. I'm thinking of two specific applications:
1) I want to reflash the bottom of some of my siding, but this will be in contact with steel strong-ties on the wall and steel nails into the sheathing.
2) I also want to patch a metal duct with some of the leftover aluminum, which will then be sealed with foil-tape.
Both of these are "dry" applications, but moisture in the air could affect both, no?