Abstract
The structure of the rust formed on Al 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 0.8 mass% Al 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) of the rusted steel. It was found that Rrust of Al bearing steel was much larger than that of SMA or SM. EXEFS(Extended X-ray Emission Fine Structure)and the X-ray analysis by EPMA and TEM-EELS showed that Al existed in Al3+ oxidized state in the inner iron rust layer for Al bearing steel. TEM showed that nano-scale complex iron oxides containing Al were formed in the inner rust of the Al bearing steel. Finally, it was found that the corrosion resistance of Al bearing steel could be increased by the formation of the nano-scale complex oxide containing Al in inner rust to prevent the penetration of Cl ions.
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