Brass is an alloy that contains copper, and so the two metals are non-reactive to one another. Neither will cause the other to corrode.
When mounting brass/copper to galvanized metal/steel, however, use dielectric connectors to avoid corrosion of the galvanized metal since brass/copper will promote corrosion of the steel, while the brass/copper attached to it will remain corrosion free.
When mounting brass/copper to galvanized metal/steel, however, use dielectric connectors to avoid corrosion of the galvanized metal since brass/copper will promote corrosion of the steel, while the brass/copper attached to it will remain corrosion free.