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Electrochemical impedance study for modeling the anticorrosive performance of coatings based on accelerated tests and outdoor exposures

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Abstract

In this study, the atmospheric corrosive protection characteristics of four organic coatings were modeled based on the evolution of low-frequency impedance (|Z| ω→0) over time when subjected to accelerated tests and outdoor exposures. Environmental characteristics such as the time of wetness, chloride and sulfate depositions, and ultraviolet radiation were defined as explanatory variables. The results obtained helped to establish a relationship between |Z| ω→0, acquired from electrochemical impedance spectra, and the explanatory variables. An adjustment factor was calculated for each coating against the most aggressive natural exposure, resulting in a good prediction of |Z| ω→0 and the performance of the coatings for other outdoor tests.

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Acknowledgments

The authors are pleased to acknowledge the financial assistance of the “Departamento Administrativo de Ciencia, Tecnología e Innovación – COLCIENCIAS” “Interconexión Electrica S.A. (ISA,),” and the Universidad de Antioquia. The authors wish to thank Professor Juan Delgado for his contribution and discussion of the statistical model.

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Authors and Affiliations

  1. Centro de Investigación, Innovación y Desarrollo de Materiales – CIDEMAT, Faculty of Engineering, Universidad de Antioquia – UdeA, Calle 70 No. 52-21, Medellín, Colombia

    Franky E. Bedoya, Ángela Bermúdez, Juan G. Castaño, Félix Echeverría & Jorge A. Calderón

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  1. Franky E. Bedoya
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  2. Ángela Bermúdez
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  3. Juan G. Castaño
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  4. Félix Echeverría
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  5. Jorge A. Calderón
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Correspondence to Jorge A. Calderón.

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Bedoya, F.E., Bermúdez, Á., Castaño, J.G. et al. Electrochemical impedance study for modeling the anticorrosive performance of coatings based on accelerated tests and outdoor exposures. J Coat Technol Res 13, 895–904 (2016). https://doi.org/10.1007/s11998-016-9803-7

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