cool idea, thanks.

I recently took my swivel cleat & pads off to service the old swivel cleat, and noticed corrosion on the aluminum beam under the pad. Any ideas on how to avoid corrosion like this? I'm used to seeing corrosion where SS screws go into Aluminum, but this was a 2" diameter circle that will eventually eat through my beam!
What about cleaning it before mounting, then using silicone or something to seal it and keep salt water out?