You often see copper and galvanized steel plumbing mixed in residential water systems with nothing separating them other than a little thread sealant or Teflon plumbing tape. The galvanic connection (copper to steel) can be trouble-free for years or the steel plumbing can begin to corrode almost as soon as the connection is tight.
There are a few things that you can do. The best option is to use a plumbing fitting called a dielectric union to connect copper pipe to galvanized steel. The fitting uses a steel collar on the steel side and a copper collar on the copper side and isolation bushings to keep the parts separate.
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