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The structure of the rust formed on silicon (Si) bearing steel was analyzed by EPMA and FIB-TEM, and the electrochemical behavior of the rust was investigated by the electrochemical impedance spectroscopy (EIS) method after the exposure test. The Si bearing steel showed high corrosion resistance compared to carbon steel (SM) and conventional weathering steel (SMA) in the exposure test. EIS measurement was taken to estimate the rust resistance (Rrust) and corrosion resistance (Rt) of the rusted steel. It was found that Rrust and Rt of Si bearing steel were much larger than those of SMA or SM. EXEFS (Extended X-ray Emission Fine Structure) and the Characteristic X-rays analysis by EPMA and TEM-EELS showed that Si existed as oxidized-state in the inner iron rust layer for Si bearing steel. FIB-TEM showed that nano-scale complex iron oxides containing Si were formed in the inner rust of the Si bearing steel. Finally, it was found that the corrosion resistance of Si bearing steel could be increased by the formation of the nano-scale complex oxides containing Si in inner rust to prevent the penetration of Cl ions.

Electrochemical Behavior and Structure of Rust on Silicon Bearing Steel after Exposure Test