This study analyzed adherent rust remaining on steel members using Raman spectroscopy and identified magnetite as the primary component, with localized β-FeOOH near the steel surface. When a CS coating was applied over the rust, it demonstrated corrosion resistance comparable to hot-dip galvanizing for up to 160 cycles, and the zinc in the coating was expected to provide electrochemical protection to the steel substrate through anodic reaction.
