Volume 6 Issue 3
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Article Navigation >  Water Science and Engineering  > 2013  >  6(3): 354-363
Jin-xia XU, Lin-hua JIANG, Wei-lun WANG, Li TANG, Li CUI. 2013: Effectiveness of inhibitors in increasing chloride threshold value for steel corrosion. Water Science and Engineering, 6(3): 354-363. doi: 10.3882/j.issn.1674-2370.2013.03.011
Citation: Jin-xia XU, Lin-hua JIANG, Wei-lun WANG, Li TANG, Li CUI. 2013: Effectiveness of inhibitors in increasing chloride threshold value for steel corrosion. Water Science and Engineering, 6(3): 354-363. doi: 10.3882/j.issn.1674-2370.2013.03.011
shu

Effectiveness of inhibitors in increasing chloride threshold value for steel corrosion

doi: 10.3882/j.issn.1674-2370.2013.03.011
  • 1.

    College of Mechanics and Materials, Hohai University, Nanjing 210098, P. R. China

  • 2.

    Shenzhen Durability Center for Civil Engineering, Shenzhen University, Shenzhen 518060, P. R. China

Funds:  This work was supported by the National Natural Science Foundation of China (Grants No. 51278168 and 51278167), the China Postdoctoral Science Foundation Funded Project (Grant No. 20100481082), the China Postdoctoral Science Foundation Special Funded Project (Grant No. 201104544), the Jiangsu Planned Projects for Postdoctoral Research Funds (Grant No. 1002019B), the Qing Lan Project, and the Opening Project of Shenzhen Durability Center for Civil Engineering, Shenzhen University (Grant No. SZDCCE11-03).
More Information
  • Corresponding author: Jin-xia XU
  • Received Date: 2011-10-10
  • Rev Recd Date: 2012-06-13
    Abstract
  • This investigation was aimed at evaluating the effectiveness of corrosion inhibitors in increasing the chloride threshold value for steel corrosion. Three types of corrosion inhibitors, calcium nitrite (Ca(NO2)2), zinc oxide (ZnO), and N,N'-dimethylaminoethanol (DMEA), which respectively represented the anodic inhibitor, cathodic inhibitor, and mixed inhibitor, were chosen. The experiment was carried out in a saturated calcium hydroxide (Ca(OH)2) solution to simulate the electrolytic environment of concrete. The inhibitors were initially mixed at different levels, and then chloride ions were gradually added into the solution in several steps. The open-circuit potential (Ecorr) and corrosion current density (Icorr) determined by electrochemical impedance spectra (EIS) were used to identify the initiation of active corrosion, thereby determining the chloride threshold value. It was found that although all the inhibitors were effective in decreasing the corrosion rate of steel reinforcement, they had a marginal effect on increasing the chloride threshold value.

     

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