May 2020

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Water Management: Minimize white rust in galvanized cooling systems

Galvanized coatings for cooling tower systems (cooling towers, evaporator tube bundles, etc.) have been used in the industry since the 1950s due to their relatively low cost and long service life.

Mowbray, M., U.S. Water Services Inc.

Galvanized coatings for cooling tower systems (cooling towers, evaporator tube bundles, etc.) have been used in the industry since the 1950s due to their relatively low cost and long service life. The galvanizing process bonds a layer of zinc metal to steel. When properly applied and passivated, the zinc coating works as a nonpermeable sacrificial anode to prevent corrosion of the underlying steel structure. White rust (FIG. 1), which is the oxidation form of the zinc coating, shows up as white spots and bumps on a galvanized surface. Fig. 1. White rust shows up as white spots and bumps on a galvanized steel surface. White rust is a combination

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