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Development of Multi-Layered Self-Healing Coating Systems for Corrosion Mitigation of Offshore Wind Turbines

Picture for Development of Multi-Layered Self-Healing Coating Systems for Corrosion Mitigation of Offshore Wind Turbines
Available for download
Product Number: 51321-16409-SG
Author: Adamantini Loukodimou/ Vikas Kumar/ David Weston/Idalina Vieira Aoki/Shiladitya Paul
Publication Date: 2021
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$20.00
$20.00

The protection of offshore structures and more specifically of wind turbines from marine corrosion is crucial. In order to improve the operational efficiency and the overall lifetime, protection from this harsh environment is necessary. In this work, it is presented the formation of the polystyrene shell microcapsules using 3-octanoylthio-1-propyltriethoxysilane (NXT) as a corrosion inhibitor carrier that has self-healing properties when combined with a proper catalyst on the metallic substrates. Specifically, the synthesized inhibitor is applied on the Zn85/Al15 arc spray coating on S355 J2+AR metallic substrate. With different concentrations of the applied NXT inhibitor, the corrosion properties of the Zn85/Al15 coatings were measured using Electrochemical Impedance Spectroscopy (EIS), Open Circuit Potential (OCP), Polarization Curve (PC) and Linear Polarization Resistance (LPR). Our results revealed that out of all the used concentrations, 300 ppm provides best protection. Surface morphological characterization exhibits that the coating is porous and corrodes readily, as expected to provide sacrificial protection to the underlying steel, so additional paint layer is necessary to fill the pores and provide a barrier layer. Hence, this work highlights the importance and applications of NXT based corrosion inhibitor with selfhealing properties for metal structures in challenging environments.

Key words: Corrosion, offshore structures, self-healing systems, Zn85/Al15 sacrificial layer

The protection of offshore structures and more specifically of wind turbines from marine corrosion is crucial. In order to improve the operational efficiency and the overall lifetime, protection from this harsh environment is necessary. In this work, it is presented the formation of the polystyrene shell microcapsules using 3-octanoylthio-1-propyltriethoxysilane (NXT) as a corrosion inhibitor carrier that has self-healing properties when combined with a proper catalyst on the metallic substrates. Specifically, the synthesized inhibitor is applied on the Zn85/Al15 arc spray coating on S355 J2+AR metallic substrate. With different concentrations of the applied NXT inhibitor, the corrosion properties of the Zn85/Al15 coatings were measured using Electrochemical Impedance Spectroscopy (EIS), Open Circuit Potential (OCP), Polarization Curve (PC) and Linear Polarization Resistance (LPR). Our results revealed that out of all the used concentrations, 300 ppm provides best protection. Surface morphological characterization exhibits that the coating is porous and corrodes readily, as expected to provide sacrificial protection to the underlying steel, so additional paint layer is necessary to fill the pores and provide a barrier layer. Hence, this work highlights the importance and applications of NXT based corrosion inhibitor with selfhealing properties for metal structures in challenging environments.

Key words: Corrosion, offshore structures, self-healing systems, Zn85/Al15 sacrificial layer

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