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Thermal Diffusion Galvanizing (TDG) coating was investigated with and without various recommended topcoats for both short and long-term exposure. The samples were exposed in outdoor test condition for up to 45 months.
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Coatings are widely used to mitigate corrosion of structural steel in aggressive humid environments. Zinc-rich primer three-coat paint systems are widely used to mitigate corrosion of steel bridges. However, the associated costs of its required maintenance are high. As part of a research program, chemically bonded phosphate ceramics (CBPC), thermal diffusion galvanizing (TDG) and metallizing coatings along with the current 3-coat systems were exposed in outdoor conditions for up to 2 years and in salt-fog exposure for up to 14,600 hours.