Galvanizing is. But galvanic corrosion occurs when dissimilar metals come into contact. The zinc will corrode first in such circumstances, but it's better to avoid the situation in the first place.

There are 2 method Hot dip galvanized is dipped into a hot bath if zinc making a good rust protection (dull grey)

Zinc plating is a thinner zinc coated applied using an electric current (shiny silver) and is less effective and les durable than hot dip.