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  • 1.
    Persson, Daniel
    et al.
    RISE Research Institutes of Sweden.
    Heydari, G
    SSAB Europe, Sweden.
    Edvinsson, Camilla
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Sundell, P. E.
    SSAB Europe, Sweden.
    Depth-resolved FTIR focal plane array (FPA) spectroscopic imaging of the loss of melamine functionality of polyester melamine coating after accelerated and natural weathering2020In: Polymer testing, ISSN 0142-9418, E-ISSN 1873-2348, Vol. 86, article id 106500Article in journal (Refereed)
    Abstract [en]

    FTIR-ATR (Focal Plane Array) FPA spectroscopic imaging was used to obtain depth resolved information about degradation of a polyester melamine coating by performing measurements on drilled conical holes. The results of the FTIR-FPA imaging show that combined effect of UV and moisture resulted in larger degradation effects in the outermost parts of the coatings but loss of melamine functionality was detected to the depth of approximately 8–10 μm after 2163 h weathering in QUVA accelerated test and after 4 years exposure in a marine environment. Longer periods of accelerated weathering, up to 4000 h, resulted in degradation through the whole coating outer layer.

  • 2.
    Wärnheim, Alexander
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Edvinsson, Camilla
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Sundell, Per-Erik
    SSAB Europe, Sweden.
    Heydari, Golrokh
    SSAB Europe, Sweden.
    Deltin, Tomas
    Nordic United Coatings, Sweden.
    Persson, Dan
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Depth-Resolved FTIR-ATR Imaging Studies of Coating Degradation during Accelerated and Natural Weathering─Influence of Biobased Reactive Diluents in Polyester Melamine Coil Coating2022In: ACS Omega, E-ISSN 2470-1343, Vol. 7, no 27, p. 23842-Article in journal (Refereed)
    Abstract [en]

    Improved methods to assess the degradation of coil coatings to approximate lifetime have been an area of academic and industrial interest for decades. This work aims to elucidate the differences in the degradation behavior of two coil coating systems: one standard commercial formulation and one formulation with a significant addition of biorenewable reactive diluents. Depth-resolved degradation behavior of samples exposed to accelerated and natural field weathering is assessed. Focal plane array attenuated total reflection-Fourier transform infrared spectroscopy was used to acquire high-resolution chemical data from a sloping cross section. The results agreed with conventional photoacoustic spectroscopy. Degradation profiles for the two coatings were significantly different, with the biobased samples showing a more durable behavior. This study provides a method for detailed assessment of coating degradation, giving a good estimation of its durability. This is both a way to compare the performance of coating systems and to improve the understanding of the impact of exposure conditions, paving the way for the development of more sustainable coil coatings.

  • 3.
    Wärnheim, Alexander
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Corrosion. KTH Royal Institute of Technology, Sweden.
    Kotov, Nikolay
    KTH Royal Institute of Technology, Sweden.
    Dobryden, Illia
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design. KTH Royal Institute of Technology, Sweden.
    Telaretti Leggieri, Rosella
    KTH Royal Institute of Technology, Sweden.
    Edvinsson, Camilla
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Heydari, Golrokh
    SSAB, Sweden.
    Sundell, Per-Erik
    SSAB, Sweden.
    Deltin, Tomas
    Nordic United Coatings, Sweden.
    Johnson, C. Magnus
    KTH Royal Institute of Technology, Sweden.
    Persson, Dan
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Claesson, Per M.
    KTH Royal Institute of Technology, Sweden.
    Nanomechanical and nano-FTIR analysis of polyester coil coatings before and after artificial weathering experiments2024In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 190, article id 108355Article in journal (Refereed)
    Abstract [en]

    Local heterogeneities can have significant effects on the performance of anti-corrosion coatings. Even small features can act as initiation points for damage and result in corrosion of the substrate material. Analysis methods with high spatial resolution and the ability to collect information relevant to crosslinking and degradation behavior of these coatings are therefore highly relevant. In this work, we demonstrate the utility of nanomechanical AFM measurements and nano-FTIR in investigating the nanoscale mechanical and chemical properties of two polyester coil coating clearcoats before and after weathering. On the nanoscale, weathering led to a stiffer and less deformable coating with less variation in the nanomechanical properties. Chemical degradation was quantified using changes in band ratios in the IR-spectra. Macro and nano-scale measurements showed similar trends with the latter measurements showing larger heterogeneity. Our results demonstrate the usefulness of the described analysis techniques and will pave the way for future studies of local properties in other coating systems and formulations. © 2024 The Authors

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