Yes. Active service naval ships use cathodic protection with zinc anodes
that have to be replaced every year or two.

I'm in active service in the Dept of the Navy as a shipriding Marine
Engineer. I live in a world where we pay a lot of attention to the
things that really could end up being showstoppers or inspection-
passing obstacles; and usually don't have any time left for the
theoretical niceties. I'm not qualified to discuss the theoretical
utility of active cathodic-protection systems; I can report that I've
never seen a Chief Engineer direct an underling to pay attention to
the cathodic protection system.

Magnetic Silencing seems to fall into the same category. I guess that
will change the first time the Iranians use a torpedo against us.