It looks like i'm getting some rust on the frame behind the compressor bracket. Thankfully just surface rust but I don't want to let it get any worse.

Back in 2023 soon after I purchased the truck I found the compressor mount had corroded away where it attaches to the frame. I replaced the mount, bolts and u-nuts then coated the frame with fluid film. It seems like now the steel frame is corroding faster than the aluminum mount, and rusting a little faster than the rest of the frame which still has most of it's paint.

Has anyone else delt with this before? Is there a method to isolate the mount to stop the galvanic corrosion?