[Shin Pad]

The thing is, with the ACQ pressure treated wood, it has a higher copper content than the CCA pressure treated wood that used to be readily available, so it will eventually react (electrolysis) with galvanized metal or steel or aluminum and will deteriorate the fasteners fairly quickly. From that standpoint, the green screws or stainless steel screws are the best for any applications involving ACQ pressure treated wood. Note - most of the treated lumber you buy these days is the ACQ pressure treated lumber. I would even go as far as to prepaint all galvanized metal brackets that you would use with your fence, prior to installing them (just to keep the galvanized metal from coming in direct contact with the pressure treated wood).

If you must use galvanized nails with ACQ lumber, make sure you get triple galvanized nails (they aren't that readily available), or use stainless steel nails.