Strap some zinc to the bolts. It will cathodically protect the steel (same
concept as galvanizing and also, for example, corrosion protection used in
water heaters). Google "cathodic protection" if you want more details. The
zinc will corrode preferentially to the iron/steel and protect even the
portion inside the concrete. You can get zinc from roofing companies as it
is used for controlling moss on shake roofs but any slab of zinc will do as
long as it is electrically connected to the steel. Alternatively if you can
find a paint that contains zinc particles that should also work.
John VA7XB
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