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Acta Chimica Sinica >

2012 , Vol. 70 >Issue 10: 1213 - 1220

DOI: https://doi.org/10.6023/A1111082

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Electrochemistry Behavior of Rebars with Different Grain Size and Mott-Schottky Research of Passive Films

  • Luo Jian ,
  • Wang Yi ,
  • Jiang Jibo ,
  • Zhong Qingdong ,
  • Zhu Zhenyu ,
  • Zhang Lei
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  • Key Laboratory of Modern Metallurgy and Material Processing of Shanghai, Shanghai University, Shanghai 200072

Received date: 2011-11-08

  Revised date: 2012-03-05

  Online published: 2012-05-16

Supported by

Project was supported by the National Natural Science Foundation of China (Nos. 50571059, 50615024), the Program for New Century Excellent Talents in University of Ministry of Education of China (No. NCET-07-0536) and the Program for Innovaltive Research Team in University of Ministry of Education of China (No. IRT0739).

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Abstract

The effect of grain size on the electrochemistry behavior of rebars in 3.5% NaCl solution were investigated using electrochemical impedance spectroscopy (EIS) and polarization curves. The Mott-Schottky curves at different potentials were employed to compared the passive film formed on the rebars with different grain size. The results showed that fine-grained rebars had larger impedance value and less corrosion current density than coarse-grained rebars after immersed 14 d, and the corrosion resistance of fine-grained rebar was better. The passive film formed in borate buffer solution behaviored like a classical n-type semiconductor, and the passive ranges of the rebars were all between -0.15 and 0.8 V. The stability and corrosion resistance of the passive film formed on fine-grained rebars were worse than those of coarse-grained rebars at the potential of -0.1, 0.2 and 0.5 V. The subcoat of the film vanished at the potential of 0.5 V. The donor densities was minimum, and the film was most compact and stable.

Key words： corrosion resisting; grain size; rebar; Mott-Schottky

Cite this article

Luo Jian , Wang Yi , Jiang Jibo , Zhong Qingdong , Zhu Zhenyu , Zhang Lei . Electrochemistry Behavior of Rebars with Different Grain Size and Mott-Schottky Research of Passive Films[J]. Acta Chimica Sinica, 2012 , 70(10) : 1213 -1220 . DOI: 10.6023/A1111082

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