Influence of mill scale and rust layer on the corrosion resistance of low-alloy steel in simulated concrete pore solution |
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| Authors: | Jin-jie Shi Jing Ming |
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| Affiliation: | Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China |
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| Abstract: | Electrochemical impedance spectroscopy, cyclic potentiodynamic polarization measurements, and scanning electron microscopy in conjunction with energy-dispersive X-ray spectroscopy were used to investigate the influence of mill scale and rust layer on the passiva-tion capability and chloride-induced corrosion behaviors of conventional low-carbon (LC) steel and low-alloy (LA) steel in simulated con-crete pore solution. The results show that mill scale exerts different influences on the corrosion resistance of both steels at various electro-chemical stages. We propose that the high long-term corrosion resistance of LA steel is mainly achieved through the synergistic effect of a gradually formed compact, adherent and well-distributed Cr-enriched inner rust layer and the physical barrier protection effect of mill scale. |
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| Keywords: | steel reinforced concrete low alloy steel low carbon steel steel corrosion corrosion resistance |
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