Galvanization provides a protective zinc coating that prevents premature rust and corrosion on your tubing. With this protective coating, galvanized round tubing will not only last longer but will also require less maintenance.

Benefits of Galvanized Round Tubing
Because the round tubing is galvanized, it is protected from rust and corrosion. Steel rusts after interacting with water or moisture in the air over time. By adding a coating of zinc to the tubing, galvanized steel round tubing corrodes much slower, extending the life of your tubing.
link:http://www.jiade-group.com