Galvanic corrosion is a problem when the two metals are wet or damp , water being necessary to conduct current causing corrosion. In some conditions of humidity and temperature change ,a small amount of water can condense ,promoting corrosion. Any time aluminum is connected to another metal there can be corrosion. I once had a home with a damp crawl space, all copper wire in galvanized conduit . When I worked in the boxes I wondered why there was white powder zinc oxide . Until one day under the right,or wrong, conditions I opened a box and several drops of water dripped out of the conduit.

Galvanic corrosion is a problem when the two metals are wet or damp , water being necessary to conduct current causing corrosion. In some conditions of humidity and temperature change ,a small amount of water can condense ,promoting corrosion. Any time aluminum is connected to another metal there can be corrosion. I once had a home with a damp crawl space, all copper wire in galvanized conduit . When I worked in the boxes I wondered why there was white powder zinc oxide . Until one day under the right,or wrong, conditions I opened a box and several drops of water dripped out of the conduit.Aluminum will oxidize by itself in air depending on humidity.