Effect of Ca(OH)2, NaCl, and Na2SO4 on the corrosion and electrochemical behavior of rebar

Zuquan Jin; Xia Zhao; Tiejun Zhao; Baorong Hou; Ying Liu

doi:10.1007/s00343-017-5319-y

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Effect of Ca(OH)2, NaCl, and Na2SO4 on the corrosion and electrochemical behavior of rebar

Updated：2023-05-16

- Effect of Ca(OH)2, NaCl, and Na2SO4 on the corrosion and electrochemical behavior of rebar
- Journal of Oceanology and Limnology Vol. 35, Issue 3, Pages: 681-692(2017)
- Affiliations：
  
  1. College of Civil Engineering Qingdao University of Technology
  2. Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of Oceanology Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/s00343-017-5319-y
  CLC：
- Online First：14 June 2016，
  
  Published：2017
- Accepted：
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Jin, Z., Zhao, X., Zhao, T. et al. Effect of Ca(OH)2, NaCl, and Na2SO4 on the corrosion and electrochemical behavior of rebar., Chin. J. Ocean. Limnol. 35, 681–692 (2017). https://doi.org/10.1007/s00343-017-5319-y
DOI：

Jin, Z., Zhao, X., Zhao, T. et al. Effect of Ca(OH)2, NaCl, and Na2SO4 on the corrosion and electrochemical behavior of rebar., Chin. J. Ocean. Limnol. 35, 681–692 (2017). https://doi.org/10.1007/s00343-017-5319-y DOI：

摘要

Abstract

The corrosion of rebar in reinforced concrete in marine environments causes significant damage to structures built in ocean environments. Studies on the process and mechanism of corrosion of rebar in the presence of multiple ions may help to control damage and predict the service life of reinforced concrete structures in such environments. The effect of interactions between sulfate and chloride ions and calcium hydroxide on the electrochemical behavior of rebar are also important for evaluation of structure durability. In this work

electrochemical impedance spectroscopy (EIS) plots of rebar in Ca(OH)2 solution and cement grout

including NaCl and Na2SO4 as aggressive salts

were measured for diff erent immersion times. The results show that corrosion of rebar was controlled by the rate of charge transfer as the rebar was exposed to chloride solution. In the presence of high concentrations of sulfate ions in the electrolyte

generation and dissolution of the passive film proceeded simultaneously and corrosion was mainly controlled by the diff usion rate. When Na2SO4 and NaCl were added to Ca(OH)2 solution

the instantaneous corrosion rate decreased by a factor of 10 to 20 as a result of the higher pH of the corroding solution.

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references

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