ABSTRACT

Galvanized steel provides excellent rust resistance and hence has been used in a wide range of applications. A compact protective layer, also called as “zinc patina”, is formed on galvanized steel after exposure to the atmosphere for a long period of time, e.g., 2 years [1]. A freshly galvanized steel surface is sensitive to white rust and, therefore, needs an additional protective layer as a rust barrier before the patina layer is formed [2].