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<p>The self-healing properties of dual-component epoxy microcapsules are evaluated when incorporated into an epoxy coating. The performance of the coating was assessed under immersion in a saline solution, simulating seawater conditions. Initially, synthesized microcapsules are incorporated into the epoxy coating. Then, the self-healing capabilities of the coating are studied under immersion using scanning vibrating electrode technique (SVET), open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and immersion corrosion test on coated samples with intentionally created artificial defects. The last three tests were conducted in&#xa0;a 3.5% NaCl solution. The adhesion of the coating is also studied by pull-off adhesion test. SVET analyses reveal lower ionic current densities in coated samples containing microcapsules during 24&#xa0;h of immersion. EIS results demonstrate self-healing at the defect site for up to 12&#xa0;h of immersion. After this time, the corrosion protection diminishes with prolonged immersion in the saline solution. Despite this, the coating with the microcapsules exhibits decrease in the corrosion process compared to the coating without the microcapsules. These results are consistent and complement the outcomes of the immersion tests conducted over 360 and 1056&#xa0;h, which indicate that coated samples without microcapsules exhibit double the corrodedareas around the scribes compared to coated samples containing the microcapsules. These findings offer a promising outlook for applying this coating on offshore carbon steel structures under immersion aiming for a longer lifetime with less maintenance intervention.</p>

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Self-healing capability of epoxy coating using dual-component microcapsules under immersion

  • 期刊论文

  • 发表日期：

    2025年2月27日

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  • Mariel Amparo Fernandez Aramayo,
  • Idalina Vieira Aoki

摘要

The self-healing properties of dual-component epoxy microcapsules are evaluated when incorporated into an epoxy coating. The performance of the coating was assessed under immersion in a saline solution, simulating seawater conditions. Initially, synthesized microcapsules are incorporated into the epoxy coating. Then, the self-healing capabilities of the coating are studied under immersion using scanning vibrating electrode technique (SVET), open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and immersion corrosion test on coated samples with intentionally created artificial defects. The last three tests were conducted in a 3.5% NaCl solution. The adhesion of the coating is also studied by pull-off adhesion test. SVET analyses reveal lower ionic current densities in coated samples containing microcapsules during 24 h of immersion. EIS results demonstrate self-healing at the defect site for up to 12 h of immersion. After this time, the corrosion protection diminishes with prolonged immersion in the saline solution. Despite this, the coating with the microcapsules exhibits decrease in the corrosion process compared to the coating without the microcapsules. These results are consistent and complement the outcomes of the immersion tests conducted over 360 and 1056 h, which indicate that coated samples without microcapsules exhibit double the corrodedareas around the scribes compared to coated samples containing the microcapsules. These findings offer a promising outlook for applying this coating on offshore carbon steel structures under immersion aiming for a longer lifetime with less maintenance intervention.