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Water permeation and corrosion resistance of single- and two-component hydrophobic polysiloxane barrier coatings

Abstract

The degradation of corrosion preventative coatings contributes to the high cost and time requirements for maintaining structures in harsh environments. However, the development of new hydrophobic coatings holds the promise of extending the usable life of structures in marine environments. In this work, we quantify the barrier properties and corrosion resistance of two novel highly hydrophobic polysiloxane formulations and the legacy silicone alkyd topcoat used on the topside of Navy’s ships, all with haze gray pigmentation. Based on FTIR-ATR and EIS measurements of the pristine coatings, both the single- (1K) and the two-component (2K) polysiloxane provide significantly improved barrier characteristics (lower water diffusion coefficient and capacitance) than the silicone alkyd. These results were confirmed through a 3-month-long immersion corrosion test, which also showed that the 1K and 2K polysiloxane coatings had comparable degradation characteristic and remained highly hydrophobic.

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Acknowledgments

KR, KNS, and LPW acknowledge funding from the US Department of Defense under the Technical Corrosion Collaboration (TCC) Program through Grant No. FA7000-14-2-0015. This TCC grant is administered by the US Air Force Academy. The authors acknowledge the use of facilities at the LeRoy Eyring Center for Solid State Science at Arizona State University.

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Correspondence to K. N. Solanki or K. Rykaczewski.

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X. Sun and S. Turnage have contributed equally to this work.

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Sun, X., Turnage, S., Iezzi, E.B. et al. Water permeation and corrosion resistance of single- and two-component hydrophobic polysiloxane barrier coatings. J Coat Technol Res 14, 1247–1258 (2017). https://doi.org/10.1007/s11998-017-9918-5

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  • DOI: https://doi.org/10.1007/s11998-017-9918-5

Keywords

  • Polysiloxane
  • Barrier coating
  • EIS
  • IR spectroscopy
  • SEM