It is important to understand that the corrosive nature of ACQ treated wood comes from electrolysis, not a low PH(acid) quality of the lumber. One of the easiest ways to use a non ACQ rated metal component is simply to insulate it from the copper in the treated wood with an adhesive flashing barrier. This interrupts the conductivity between the steel component and the copper in the wood. This is actually a building code approved method for when a hanger or other engineered component that is unavailable in a resistant form must be used. In the photo you can see how I have bedded the post with a strip of Vycor “deck protector and then scored the outline of the hinge to remove the excess flashing around the hinge. You can learn more about ACQ and electrolysis in my related post below.