Acta Metall Sin  2011, Vol. 47 Issue (6): 735-742    DOI: 10.3724/SP.J.1037.2011.00057

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CORRELATION BETWEEN COMPOSITION OF REINFORCING STEEL SURFACE FILM AND STEEL CORROSION BEHAVIOR IN SIMULATED CONCRETE PORE SOLUTIONS

CHEN Wen, DU Ronggui, HU Ronggang, SHI Haiyan, ZHU Yanfeng, LIN Changjian

State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005

CHEN Wen DU Ronggui HU Ronggang SHI Haiyan ZHU Yanfeng LIN Changjian. CORRELATION BETWEEN COMPOSITION OF REINFORCING STEEL SURFACE FILM AND STEEL CORROSION BEHAVIOR IN SIMULATED CONCRETE
PORE SOLUTIONS. Acta Metall Sin, 2011, 47(6): 735-742.

Abstract References Related Articles Recommended Metrics Download:  PDF(565KB)  Export:  BibTeX | EndNote (RIS)       Abstract  It is well known that reinforcing steel in concrete can be protected from corrosion by forming a compact passive film on its surface in a concrete pore solution with high alkalinity. The corrosion behavior of the steel is related to its passivation and depassivation. The pH value and the Cl− concentration in a concrete pore solution are of the most important parameters affecting the passivity of reinforcing steel in concrete. In the present work, XPS analysis, linear polarization and potentiodynamic anodic polarization tests were used to study the relationship between the electrochemical corrosion behavior of reinforcing steel immersed in a simulated concrete pore solution and the chemical composition of the steel surface film. The results showed ht with the increase of the Cl− concentration or the decrease of the pH value in the solution, the corrosion potential of the steel shifted negatively and its corrosion current density rose, and the Fe2+ content of the steel surface film increased and the Fe3+ content decreased. The steel was in an active state in the solution with Cl− concentration higher than 0.6 mol/L or pH lower than 11.31, and the addition of 0.24 mol/L NaNO2 to the solution could protect steel from corrosion. Key words:  reinforcing steel      simulated concrete pore solution      polarization curve      Cl−      Received:  24 January 2011      ZTFLH:  O646   Fund:  Supported by National Natural Science Foundation of China (Nos.21073151 and 50731004)and National High Technology Research and Development Program of China (No.2009AA03Z327) Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors CHEN Wen DU Rong-Gui HU Rong-Gang SHI Hai-Yan ZHU Yan-Feng LIN Chang-Jian URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00057     OR     https://www.ams.org.cn/EN/Y2011/V47/I6/735 [1] Kumar V. Corros Rev, 1988; 16: 317 [2] Huet B, L’Hostis V, Miserque F, Idrissi H. Electrochim Acta, 2005; 51: 172 [3] Saremi M, Mahallati E. Cem Concr Res, 2002; 32: 1915 [4] Moreno M, Morris W, Alvarez M G, Duffo G S C. Corros Sci, 2004; 46: 2681 [5] Du R G, Hu R G, Huang R S, Lin C J. Anal Chem, 2006; 78: 3179 [6] Allahkaram S R, Khodayari M. 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