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In article ,
says...

OR if you want a really radical alternative to painting a bronze prop
on a stainless shaft, arrange for the shaft to be fed a small current
with say +1 volt wrt the prop. It may grow a garden, but it won't
dissolve, and won't need zincs.

We have a keel cooler refrigerator. The condenser is a sintered bronze block
on the bottom of the boat through which the refrigerant flows. The block is
direct connected to the negative side of the battery. It does not corrode.
But it sure grows a garden. I susepct my garden grows not only because copper
ions are completely suppressed but also because the block is warmer than the
surrounding territory. I mean those are eating size barnacles like no other.