Corrosion behavior of low-Cr steel rebars in alkaline solutions with different pH in the presence of chlorides

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	Corrosion behavior of low-Cr steel rebars in alkaline solutions with different pH in the presence of chlorides
	Liu, Ming; Cheng, Xuequn; Li, Xiaogang; Lu, Tian Jian
刊名	JOURNAL OF ELECTROANALYTICAL CHEMISTRY
	2017
卷号	803 页码:40-50
ISSN号	1572-6657
英文摘要	Corrosion behaviors of HRB400 carbon steel and three low-Cr steel rebars in alkaline solution simulating concrete pore solution with various pH and chlorides values were studied using cyclic voltammetry, potentiodynamic polarization, electrochemical impedance spectroscopy, and Mott-Schottky combined with scanning electron microscope as well as X-ray Diffraction. Results show that pH and chloride play important roles in the formation of passive films on steel rebars. As pH value decreased, the pitting potential shifts negatively, the polarization resistance decreases while the density of current carrier in the passive film increases. In the absence of chloride, stable passive film cannot form on carbon steel in simulated concrete pore solution with pH 9.6, Cr3+ cannot remain stable in the passive film on 3Cr and 5Cr steel, and passive film on low-Cr steels are more stable than that of carbon steel. While pitting corrosion is promoted by increasing chloride ions, Cr effectively reduces pitting propagation, resulting in the high passivation capability of steel rebar in carbonated concrete pore solution. The corrosion products of carbon and low-Cr steels have common characteristics, with Cr accelerating the formation of protective alpha-FeOOH and lowering the corrosion rate. Therefore, Cr-modified steel presents excellent passive behavior and pitting corrosion resistance in simulated carbonated concrete pore solution, which can be further enhanced by increasing the Cr content.
公开日期	2017-12-25
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/13579]
专题	2017专题
推荐引用方式 GB/T 7714	Liu, Ming,Cheng, Xuequn,Li, Xiaogang,et al. Corrosion behavior of low-Cr steel rebars in alkaline solutions with different pH in the presence of chlorides[J]. JOURNAL OF ELECTROANALYTICAL CHEMISTRY,2017,803:40-50.
APA	Liu, Ming,Cheng, Xuequn,Li, Xiaogang,&Lu, Tian Jian.(2017).Corrosion behavior of low-Cr steel rebars in alkaline solutions with different pH in the presence of chlorides.JOURNAL OF ELECTROANALYTICAL CHEMISTRY,803,40-50.
MLA	Liu, Ming,et al."Corrosion behavior of low-Cr steel rebars in alkaline solutions with different pH in the presence of chlorides".JOURNAL OF ELECTROANALYTICAL CHEMISTRY 803(2017):40-50.