There probably will be some corrosion eventually. I thought about using SS Unistrut, but the solar panel frames are aluminum so it just moved the problem. Aluminum strut isn't too expensive to replace when needed, it will be the sacrificial element to this design. We use a lot of Al strut in the refineries where it is exposed not only to salt air, but who knows what else. I've been amazed at how long the stuff actually lasts.
Chip, glad to be of help. Those little black plastic boots to cover the ends of the strut are nice if yours are mounted anywhere skin could contact the edge. Here are a couple more closeups I took a few minutes ago. Two BP 85w panels putting out 96W (7.0A at 13.7V) through a Bluesky 2000E on a sunny SoCal Feb morning at 0900!