Influence of mill scale and rust layer on the corrosion resistance of low-alloy steel in simulated concrete pore solution  

作　　者：Jin-jie Shi Jing Ming 

机构地区：[1]Jiangsu Key Laboratory of Construction Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211189,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2017年第1期64-74,共11页矿物冶金与材料学报（英文版）

基　　金：the support by the National Natural Science Foundation of China(Nos.51208098 and 51678144);the National Basic Research Program of China(No.2015CB655100);the Natural Science Foundation of Jiangsu Province(No.BK20161420);Industry-University Research Cooperative Innovation Fund of Jiangsu Province(No.BY2013091)

摘　　要：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 passivation capability and chloride-induced corrosion behaviors of conventional low-carbon（LC） steel and low-alloy（LA） steel in simulated concrete pore solution. The results show that mill scale exerts different influences on the corrosion resistance of both steels at various electrochemical 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.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 passivation capability and chloride-induced corrosion behaviors of conventional low-carbon（LC） steel and low-alloy（LA） steel in simulated concrete pore solution. The results show that mill scale exerts different influences on the corrosion resistance of both steels at various electrochemical 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.

关 键 词：steel reinforced concrete low alloy steel low carbon steel steel corrosion corrosion resistance 

分 类 号：TU528[建筑科学—建筑技术科学]