Ted You will get corrosion from dissimilar metal to metal contact. To reduce this you may want to install the screws wet, by applying sealant before installing. Of course you will have some excess sealant once the screw is fully inserted, but you can wipe this off. Personally, I would use stainless steel 316 screws, dipped in Vulcum. This will provide some measure of protection from metal to metal contact, plus seal the screw hole better than just using a screw. Bobby
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