A comparison of pitting susceptibility of Q235 and HRB335 carbon steels used for reinforced concrete

Authors

  • Guoliang Zhan New Century Concrete of Guangdong Foundation Co., Ltd, Guangzhou 510660
  • Jiancheng Luo School of Chemistry and Environment, South China Normal University, Guangzhou 510006
  • Shaofei Zhao School of Chemistry and Environment, South China Normal University, Guangzhou 510006
  • Weishan Li School of Chemistry and Environment, South China Normal University, Guangzhou 510006

DOI:

https://doi.org/10.5599/jese.2012.0025

Abstract

The phase structure and the pitting susceptibility of two carbon steels, Q235 and HRB335, used for reinforced concrete, are investigated by phase observation, polarization curve measure­ments, electrochemical impedance spectroscopy, and Mott-Schottky analysis. It is found that Q235 is ferrite and HRB335 is pearlite. Q235 is more susceptible to chloride ions leading to pit­ting than HRB335. The polarization curves show that the breakdown potential of the passive film in saturated Ca(OH)2 solution containing 0.4 M NaCl is 0 V for Q235 and 0.34 V for HRB335. The Mott-Schottky analyses show that passive films formed on Q235 and HRB335 in saturated Ca(OH)2 solution containing chloride ions behave like an n-type semiconductor. The passive film formed on Q235 has a higher donor density, which explains why Q235 is more susceptible to pitting than HRB335.

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Published

06-02-2013

How to Cite

Zhan, G., Luo, J., Zhao, S., & Li, W. (2013). A comparison of pitting susceptibility of Q235 and HRB335 carbon steels used for reinforced concrete. Journal of Electrochemical Science and Engineering, 3(1), 11–17. https://doi.org/10.5599/jese.2012.0025

Issue

Section

Electrochemical Engineering