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Rust morphology characterization of polyurethane and acrylic-based marine antifouling paints after salt spray test on scribed specimens

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Abstract

A newly developed, polyurethane-based, marine antifouling coating, containing 2% immobilized Econea, was examined in terms of its anticorrosion performance. The novelty of the experimental formulation arises from the immobilization of the biocide which minimizes leaching and was accomplished via a newly developed functionalization method, based on reaction of the biocide with highly reactive isocyanate functionality. The painting system was applied on steel specimens, then scribed with a sharp cutter and examined for 12 weeks in cyclic salt spray exposure. Identification of the rust morphologies was performed with XRD, Raman spectroscopy, SEM, and EDS methods. The absence of paint deformation during the experiment led to the formation of compact corrosion products, firmly adherent to the substrate, allowing transformation to more protective forms, such as oxides (hematite, maghemite, magnetite) and the least harmful of the oxyhydroxides (goethite, feroxyhyte), found in the mixture, ensuring sufficient corrosion protection. The unscratched part of the paint served as a barrier to corrosion product expansion beyond the scribed areas. An acrylic-based antifouling system was also examined for reasons of comparison. The experimental formulation exhibited superior anticorrosion performance overall, since the acrylic system presented extended material loss, blistering, checking, and extensive substrate rust coverage beneath the multilayer coat, implying unsatisfactory corrosion protection.

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Acknowledgments

The experimental paint investigated in this work was developed in the framework of the European collaborative project FP7 FOUL-X-SPEL (Grant Agreement 285552). The authors would also like to thank Ms. E. Rosolymou and Ms. E. Siranidi for their support on obtaining the XRD and Raman measurements, respectively.

Author information

Correspondence to Evangelia D. Kiosidou.

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Kiosidou, E.D., Karantonis, A., Pantelis, D.I. et al. Rust morphology characterization of polyurethane and acrylic-based marine antifouling paints after salt spray test on scribed specimens. J Coat Technol Res 14, 1381–1395 (2017). https://doi.org/10.1007/s11998-017-9939-0

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Keywords

  • Antifouling coatings
  • Salt spray tests
  • Raman spectroscopy
  • XRD
  • SEM