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It is true that electrolysis,( the decompostion of an eloctrolyte by the action of an electric current passing through it)can deteriorate dissimilar metals.
Two of these metals are copper and galvanized steel.
Very recently it was assumed that dielectric unions between the two dissimilar metals would slow down this deterioration.
In most recent codes dielectric unions or pipe extenders have been eliminated. There use has been known to increase the decomposition action between the two metals. Other code jurisdictions are just slow to follow.
The best transition between two dissimilar metals is a brass fitting or brass pipe extender.
Good Luck,
Bill
The Local Plumber
Tustin, California http://www.TheLocalPlumber.com