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Ageing processes of coil-coated materials: Temperature-controlled electrochemical impedance analysis
Université de Toulouse, France.
RISE Research Institutes of Sweden, Materials and Production, Corrosion. Université de Toulouse, France.
RISE Research Institutes of Sweden, Materials and Production, Corrosion. Université de Toulouse, France.ORCID iD: 0000-0001-5462-2700
Université de Lyon, France.ORCID iD: 0000-0002-1753-9972
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2023 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 183, article id 107682Article in journal (Refereed) Published
Abstract [en]

In the present work, an industrial polyester coil-coated steel was characterized by electrochemical impedance spectroscopy (EIS) during immersion in a 0.5 M NaCl solution for different temperatures (30, 40, 50 and 60 °C). The objective was to propose a methodology to follow the ageing of the coil-coated system, from the first stage of water uptake until the blistering appearance. Relevant parameters were extracted from the EIS diagrams to analyse ageing processes of the polymer and of the metal/polymer interface. Water uptake was determined from the high-frequency part of the impedance diagrams using a linear rule of mixtures. By increasing the temperature, both the water uptake kinetics and the water content in the coating increased. The effect of water uptake on the physical structure of the coating (plasticization) was discussed through the analysis of a time constant corresponding to the dielectric manifestation of the polymer glass transition. At 40, 50 and 60 °C, appearance of corrosion was detected on the impedance spectra by a decrease, at low frequency, of the impedance modulus and of the phase angle. For 60 °C, the corroded surface area as a function of time, was assessed from the EIS data analysis with adapted equivalent circuits. The corroded surface areas followed similar trend as blister surface areas determined from images analysis.

Place, publisher, year, edition, pages
Elsevier B.V. , 2023. Vol. 183, article id 107682
Keywords [en]
Barrier properties, Blistering, Organic coatings, Plasticization, Water sorption, Coated materials, Corrosion resistant coatings, Electrochemical corrosion, Electrochemical impedance spectroscopy, Equivalent circuits, Glass transition, Organic polymers, Plastic coatings, Sodium chloride, Ageing process, Coil coated materials, Corroded surface, Electrochemical-impedance spectroscopies, Surface area, Water uptake
National Category
Corrosion Engineering
Identifiers
URN: urn:nbn:se:ri:diva-65540DOI: 10.1016/j.porgcoat.2023.107682Scopus ID: 2-s2.0-85161663286OAI: oai:DiVA.org:ri-65540DiVA, id: diva2:1776466
Available from: 2023-06-28 Created: 2023-06-28 Last updated: 2023-12-20Bibliographically approved

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Thierry, DominiqueLe Bozec, Nathalie

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