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Multiscale analysis of pigment effects on weathering of polyester coatings: from nanoscale chemistry to macroscale performance
RISE Research Institutes of Sweden, Materials and Production, Corrosion. KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, Stockholm, Sweden.ORCID iD: 0000-0001-6438-1357
Top Analytica, Turku, Finland.
SSAB Europe, Borlänge, Sweden.
SSAB Europe, Borlänge, Sweden.
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2025 (English)In: npj Materials Degradation, ISSN 2397-2106, Vol. 9, no 1, article id 66Article in journal (Refereed) Published
Abstract [en]

Almost all organic coatings used for corrosion protection contain various types of pigmentation, both for the sake of aesthetics and performance. By focusing on spatially resolved vibrational spectroscopy and electron microscopy, we demonstrate that the type of pigmentation has a fundamental effect on both localized and global degradation processes across the investigated coatings. Samples with white TiO<inf>2</inf> pigments display low macroscale chemical degradation across the surface but do experience a significant change in topography. SEM-EDS imaging shows that µm-scale craters are formed around the TiO<inf>2</inf> pigments. Nanoscale spatially resolved IR spectroscopy (AFM-IR) suggests that this local erosion is not triggered by reactions seen in coatings with other types of pigments. However, FTIR-ATR chemical imaging of coating cross sections confirmed that the TiO<inf>2</inf> pigments also protects material beneath the surface, resulting in very shallow chemical degradation effects as compared to the other systems. Darker coatings, containing carbon black, experience moderate to high chemical degradation across the surface, and additionally the degradation propagates deep into the coatings. Overall, this paper highlights that single criteria should not be used when comparing the degradation of different coatings.

Place, publisher, year, edition, pages
Nature Publishing Group , 2025. Vol. 9, no 1, article id 66
Keywords [en]
Organic coatings, Chemical degradation, Localised, Macroscales, Multi scale analysis, Nano scale, Organics, Performance, Polyester coatings, Spatially resolved, TiO 2, Weathering
National Category
Surface- and Corrosion Engineering Materials Chemistry
Identifiers
URN: urn:nbn:se:ri:diva-79330DOI: 10.1038/s41529-025-00617-3Scopus ID: 2-s2.0-105007526225OAI: oai:DiVA.org:ri-79330DiVA, id: diva2:2017368
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Article; Granskad

Available from: 2025-11-28 Created: 2025-11-28 Last updated: 2025-11-28Bibliographically approved

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Wärnheim, AlexanderPersson, Dan

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