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Impedance analysis of the barrier effect of coil-coated materials: Water uptake and glass transition variations
RISE Research Institutes of Sweden, Materials and Production, Corrosion. Université de Toulouse, France. (Institut de la Corrosion)
Université de Toulouse, France.
Université de Toulouse, France.
Université de Toulouse, France.
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2021 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 153, article id 106163Article in journal (Refereed) Published
Abstract [en]

In the present work, an industrial polyester coil-coated steel sample was characterized by electrochemical impedance spectroscopy. The diagrams were obtained for various immersion times in a 0.5 M NaCl solution for three different initial states of the same coil coating (as received, dried and dried after the impedance measurements). The aim of the study was to have a better knowledge of how the water uptake influences the coil coating physical properties and to extract relevant parameters of the ageing processes. From the high-frequency part of the impedance diagrams, the water uptake was calculated using a linear rule of mixtures. Two sorption regions were observed for the dried samples suggesting the presence of porosities already filled with ambient moisture for the as-received sample. It was shown that the water uptake was a slow process and, independently of the initial state of the sample, a saturation plateau was never reached, even after 456 h of immersion. A time constant, clearly visible on the phase angle of the impedance diagrams, was analysed through the dielectric permittivity formalism and attributed to the signature of the dielectric manifestation of the glass transition. This time constant was shifted to higher frequencies with increasing water fraction (increasing immersion time), consistent with a plasticization effect. This result was supported by differential scanning calorimetry measurements. Finally, the data obtained for the different initial states of the coating highlighted that, even if the water uptake was reversible, the sorption kinetics was different for the sample dried after the impedance measurements. This could be of importance in the degradation process of the coil coated steel. 

Place, publisher, year, edition, pages
Elsevier B.V. , 2021. Vol. 153, article id 106163
Keywords [en]
Barrier properties, Coil coating, Electrochemical impedance spectroscopy, Plasticization, Water sorption, Coated materials, Coatings, Differential scanning calorimetry, Electric impedance measurement, Glass, Glass transition, Permittivity, Sodium chloride, Coil coated materials, Degradation process, Dielectric permittivities, Higher frequencies, Impedance analysis, Impedance diagrams, Impedance measurement, Plasticization effects
National Category
Corrosion Engineering
Identifiers
URN: urn:nbn:se:ri:diva-52593DOI: 10.1016/j.porgcoat.2021.106163Scopus ID: 2-s2.0-85100065819OAI: oai:DiVA.org:ri-52593DiVA, id: diva2:1539823
Available from: 2021-03-25 Created: 2021-03-25 Last updated: 2023-05-16Bibliographically approved

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Thierry, Dominique

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