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CORROSION RESISTANCES OF PASSIVE FILMS ON LOW-CARBON REBAR AND FINE-GRAINED REBAR IN ALKALINE MEDIA |
SHI Jinjie, SUN Wei, GENG Guoqing |
College of Materials Science and Engineering, Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189 |
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Cite this article:
SHI Jinjie SUN Wei GENG Guoqing. CORROSION RESISTANCES OF PASSIVE FILMS ON LOW-CARBON REBAR AND FINE-GRAINED REBAR IN ALKALINE MEDIA. Acta Metall Sin, 2011, 47(4): 449-454.
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Abstract The passive ranges of low-carbon rebar and fine-grained rebar in simulated concrete pore solution with pH13.0 were determined by means of cyclic voltammetry and potentiodynamic polarization curves. Chronopotentiometry was used to obtain steady state conditions for the formation of passive films on rebar samples at different anodic potentials. Electrochemical impedance spectroscopy and Mott-Schottky curves were employed to compare the passive films formed at different potentials. Additionally, cyclic polarization curves were used to compare the corrosion resistances of passive films formed on the two rebars in alkaline media with or without Cl-. The results show that the passive ranges of the two rebars are all between -0.25 and +0.6 V, and the more stable passive films can be formed on both rebars at the anodic potential of +0.3 V. In the absence of Cl-, the stability and corrosion resistance of the passive film formed on the fine-grained rebar are better than those of low-carbon rebar. However, the pitting corrosion resistance of the former is somehow lower than that of the latter in the presence of Cl-. The amounts of grain boundary and trace elements are responsible for the lower corrosion resistance of fine-grained rebar.
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Received: 06 October 2010
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Fund: Supported by National Basic Research Program of China (No.2009CB623203), National High Technology Research and Development Program of China
(No.2008AA030704) and The Scientific Research Foundation of Graduate School of Southeast University (No.YBJJ1017) |
[1] Ralston K D, Birbilis N. Corrosion, 2010; 66: 075005[2] Afshari V, Dehghanian C. Corros Sci, 2009; 51: 1844[3] Pisarek M, Kedzierzawski P, Janik–Czachor M, Kurzydlowski K J. J Solid State Electrochem, 2009; 13: 283[4] Schino A D, Barteri M, Kenny J M. J Mater Sci, 2003; 38: 4725[5] Freire L, N´ovoa X R, Montemor M F, Carmezim M J. Mater Chem Phys, 2009; 114: 962[6] Sanchez M, Gregori J, Alonso M C, Garcia–Jareno J J, Vicente F. Electrochim Acta, 2006; 52: 47[7] Wu Q, Liu Y, Du R G, Lin C J. Acta Metall Sin, 2008; 44: 346(吴群, 刘玉, 杜荣归, 林昌健. 金属学报, 2008; 44: 346)[8] SanchezM,Gregori J, Alonso C, Garcia–Jareno J J, Takenouti H, Vicente F. Electrochim Acta, 2007; 52: 7634[9] Freire L, Carmezim M J, Ferreira M G S, Montemor M F. Electrochim Acta, 2010; 55: 6174[10] Andrade C, Merino P, Novoa X R, Perez M C, Soler L. Mater Sci Forum, 1995; 192–194: 891[11] Ghods P, Isgor O B, McRae G, Miller T. Cem Concr Compos, 2009; 31: 2[12] Li L, Sagues A A. Corrosion, 2002; 58: 305[13] Pourasee A, Hansson C M. Cem Concr Res, 2007; 37: 1127[14] Zhang F, Pan J S, Lin C J. Corros Sci, 2009; 51: 2130[15] Jiang J H, Yuan Y S, Li F M, Wang B, Ji Y S. J Build Mater, 2009; 12: 523(蒋建华, 袁迎曙, 李富民, 王 波, 姬永生. 建筑材料学报, 2009; 12: 523) |
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