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Coil-coated steel sheets measured by DMA using an immersion testing cell

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Abstract

The effect of humidity on the glass transition temperature of coatings is well known and analyzed. In this study, an analysis method is introduced for analyzing coil-coated metal sheets submerged in water and water/methyl ethyl ketone (MEK) by using an immersion cell coupled to a DMA. For this purpose, a model polyurethane acrylate coating was applied to zinc/magnesium-coated steel plates and measured before and after immersion in water and water/MEK by DMA and immersion cell. The results show a shift of glass transition temperature from 138 to 13 °C of the coating by storing the coated steel plates under water and immersion testing. A time-dependent diffusion of water from the cell into the coating until saturation can be observed. An increasing concentration of MEK within the immersion cell results in a greater shift of the glass transition temperature. Overall, the immersion cell seems to be a useful tool for in situ characterization of the behavior of coil coating varnishes in liquid environment (Foster et al. in Prog Organ Coat 51:244–249, 2004, van der Wel et al. in Prog Organ Coat 37:1–14, 1999).

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Authors and Affiliations

  1. Thyssenkrupp Steel Europe AG, Eberhardstr. 12, 44145, Dortmund, Germany

    Florian Haakmann & Martin Raulf

  2. University of Duisburg-Essen, Universitätsstraße 5, 45141, Essen, Germany

    Christian Mayer

Authors
  1. Florian Haakmann
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  2. Christian Mayer
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  3. Martin Raulf
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Correspondence to Florian Haakmann.

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Haakmann, F., Mayer, C. & Raulf, M. Coil-coated steel sheets measured by DMA using an immersion testing cell. J Therm Anal Calorim 137, 143–150 (2019). https://doi.org/10.1007/s10973-018-7944-x

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  • DOI: https://doi.org/10.1007/s10973-018-7944-x

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