2023 Volume 79 Issue 12 Article ID: 22-00162
In order to clarify the suppression mechanism of paint blistering of corrosion resistant steel for paint containing W, Cu, Ni, and Sn, rust analysis and electrochemical measurement were conducted. As a result, it was found that W, Cu, Ni, and Sn refine rust particles, W gives rust cation selective permeability and Sn and W prevent the Fe dissolution by inhibitory effects. The corrosion resistance of welded joints made of corrosion resistant steel was equal to or higher than that of the steel plate, and the mechanical properties of the steel plate and welded joints satisfied the standard values of each strength grade of JIS G 3106. The life cycle cost of repainting bridges with corrosion resistant steel is reduced by 64% compared to conventional steel.
