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Research on Chemical Intermediates

, Volume 39, Issue 5, pp 2049–2062 | Cite as

Evaluation of the corrosion inhibition effect of micro/nanocapsulated polymeric coatings: a comparative study by use of EIS and Tafel experiments and the area under the Bode plot

  • Masoumeh Kouhi
  • Ali Mohebbi
  • Mohammad Mirzaei
Article

Abstract

In this paper we propose an approach for ranking self-healing polymeric coatings containing micro/nanocapsules in order of corrosion-protection effectiveness on exposure to 3.5 % (w/w) NaCl solution. The results indicated that development of electrochemical cells was inhibited by the active components of the ruptured embedded inhibitor micro/nanocapsules which were released into a scratch inflicted in the polymeric coating on steel surface. Undamaged surface film of test and control specimens exposed to the solution had excellent corrosion-inhibition performance, as reflected by results from both electrochemical impedance spectroscopy and polarization tests. Moreover, three coatings containing capsules synthesized at three different agitation rates with the same thickness were compared to determine the optimum rate. For the optimum rate the optimum thickness was then determined. The areas under Bode plots were determined and used as useful values for evaluation and ranking the coatings. It was found that the area under the Bode plot is a good criterion for evaluating polymeric coating degradation during immersion. There was good agreement between the results of this work and those from electrochemical tests.

Keywords

Micro/nanocapsule Electrochemical impedance spectroscopy (EIS) Tafel polarization Epoxy Coating Corrosion 

Notes

Acknowledgments

The authors wish to gratefully acknowledge Dr Danaie and Dr Zare, for their valuable scientific guidance, and the personnel of the chemistry, physics, paint, and corrosion laboratories, for their endeavors and coordination. Eng. Hosseini is also kindly acknowledged for his assistance.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Masoumeh Kouhi
    • 1
    • 2
    • 3
  • Ali Mohebbi
    • 1
  • Mohammad Mirzaei
    • 4
  1. 1.Department of Chemical EngineeringShahid Bahonar University of KermanKermanIran
  2. 2.International Center for ScienceHigh Technology and Environmental ScienceMahanIran
  3. 3.Petroleum University of TechnologyAbadanIran
  4. 4.Department of ChemistryShahid Bahonar University of KermanKermanIran

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