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Evaluating barrier properties of organic coatings by water permeation and electrochemical methods

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Journal of Coatings Technology

Abstract

Water permeation, water absorption, d.c. resistance, and electrochemical impedance spectroscopy (EIS) measurements were performed on films of epoxy-polyamide used as binder in paint formulations. Barrier properties were found to be highly dependent upon the thickness of films. In thick films, water permeation measurements revealed the presence of pathways attributed to frozen holes, through which the flow is not governed by diffusion. In thin films, the presence of pinholes was detected by d.c. resistance and EIS measurements.

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Authors and Affiliations

  1. Instituto de Tecnologia para o Desenvolvimento, Brazil

    P. C. Inone & C. M. Garcia

  2. Universidade Federal de São Carlos, Brazil

    A. Rúvolo-Filho

Authors
  1. P. C. Inone
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  2. C. M. Garcia
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  3. A. Rúvolo-Filho
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Additional information

LACTEC, Área de Materiais — AMAT, Caxia Postal 19067, CEP 81531 - 990, Curitiba, Paraná, Brazil.

Departamento de Química, Grupo de Processamento e Propriedades em Polímeros, Caixa Postal 675, CEP 13565-905, São Carlos, São Paulo, Brazil.

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Inone, P.C., Garcia, C.M. & Rúvolo-Filho, A. Evaluating barrier properties of organic coatings by water permeation and electrochemical methods. Journal of Coatings Technology 75, 29–36 (2003). https://doi.org/10.1007/BF02697918

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