Unlike powder coating zinc coatings are available in only one color silver which can create severe limitations if you want to add visual appeal to your items. The first step in producing powder coated galvanized steel is galvanizing.
Other application methods also exist.
Powder coated galvanized zinc. The resulting zinc coating provides both barrier and cathodic protection for the underlying steel in the same way as a galvanized coating. However galvanizing is the process of adding a layer of zinc for this protective coating. The zinc serves as a barrier against the elements and as a cathode for the electrochemical processes that would otherwise oxidize the iron in the steel.
The powder coating provides a top layer that slows down the rate in which corrosion consumes the underlying zinc. For any application powder coating offers distinct advantages over galvanizing. Like powder coating galvanizing is the process of applying another layer of protection.
The galvanized zinc serves as a base coating that enhances corrosion protection. The steel part is coated with a thin layer of molten zinc. The powder coating can also improve the aesthetic appeal of the metal object.
The zinc coating will give metal objects tough protection against corrosion and rust. In most cases thermal spraying is more expensive than batch hot dip galvanizing for the equivalent section but these processes are complementary and used in tandem in large structures.