| Abstract Scope |
This study investigates the interfacial reactions, hot-dip galvanizing behavior, and corrosion properties of high-purity Fe, JIS G3141 SPCC-SD steel, and SUS304 stainless steel at 450°C. SEM, EDS, and EPMA were used to characterize coating phases and compositions, while OCP and potentiodynamic polarization tests were conducted in 3.5 wt.% NaCl solution. The results showed that pure Fe rapidly formed δ1k and ζ phases, with significant ζ-phase growth during galvanizing. G3141 steel showed delayed δ1k formation and suppressed ζ-phase growth. SUS304 exhibited slower initial IMC growth due to Cr and Ni, followed by the formation of a layered δ1k/δ1p/ζ structure. After galvanizing, all substrates showed more negative corrosion potentials, confirming the sacrificial anodic protection of the Zn coating. These findings clarify the differences in interfacial reactions, coating growth, and corrosion behavior among the three steels, providing useful guidance for galvanizing process design and quality control. |