Updated August 3, 2022   White Rust Formation White rust is also known as galvanic corrosion. White rust is a chalky, waxy material that forms on galvanized cooling towers. Galvanized sheet metal naturally passivates with a protective layer of zinc oxide. Chemically this passivation layer is a combination of zinc hydroxide and zinc carbonate. It … Continue reading 3 Effective Methods to Prevent White Rust in Galvanized Cooling Towers