A painted weathering steel bridge will certainly perform better than a painted carbon steel bridge in the same service environment. Weathering steel can serve without a coating under normal humid environmental conditions but fails in a severe saline condition. It is then when the coating will serve as protection against corrosion. Moreover, weathering steel needs to be exposed to alternating wetting and drying cycles to develop the protective layer. To conclude, a painted weathering steel will perform better than painted carbon steel bridge in any environment.
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