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<p>CO<sub>2</sub> and other corrosive media have been confirmed by studies as significant factors that accelerate steel and concrete corrosion. Therefore, anti-corrosion coatings are required not only to resist the penetration of corrosive solutions but also to provide resistance against gas permeation. In this study, a kind of TiO<sub>2</sub>-GO/PU composite coating was developed via a hydrothermal method, and its chemical bonding and thermal decomposition behavior were characterized. The results indicated that the mass ratio of GO and TiO<sub>2</sub> in TiO<sub>2</sub>-GO was 68.25% and 31.75%, and crosslinking occurred between TiO<sub>2</sub>-GO. Carbonation tests demonstrated that the addition of TiO<sub>2</sub>-GO significantly enhanced the CO<sub>2</sub> permeation resistance of the PU coating, with the 0.3% content showing the most noticeable improvement. Electrochemical impedance spectroscopy revealed that after immersion in 3.5 wt% NaCl solution, the coating incorporated with TiO<sub>2</sub> exhibited highest barrier properties compare with other samples. Meanwhile, the incorporation of TiO<sub>2</sub>-GO improved the pull-off adhesion and wear resistance of the coating. SEM observations of the exposed coatings showed that the 0.3% TiO<sub>2</sub>-GO/PU coating had intact surface, confirming its optimal anti-corrosion performance. These improvements were attributed to defect sealing, microcrack suppression, extended diffusion pathways, and the anchoring effect of TiO<sub>2</sub> that mitigates GO layer slippage. This study offered a long-term, economical, and efficient anti-corrosion solution in marine environments.</p>

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Robust TiO2-GO/PU Hybrid Coating as a Long-Term Barrier Against CO2 and Water Ingress in Harsh Marine Environments

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • Jin Yang,
  • Botao Zhao,
  • Hui Zeng,
  • Hailong Zhang,
  • Qingjun Zhu,
  • Chunlong Liu

摘要

CO2 and other corrosive media have been confirmed by studies as significant factors that accelerate steel and concrete corrosion. Therefore, anti-corrosion coatings are required not only to resist the penetration of corrosive solutions but also to provide resistance against gas permeation. In this study, a kind of TiO2-GO/PU composite coating was developed via a hydrothermal method, and its chemical bonding and thermal decomposition behavior were characterized. The results indicated that the mass ratio of GO and TiO2 in TiO2-GO was 68.25% and 31.75%, and crosslinking occurred between TiO2-GO. Carbonation tests demonstrated that the addition of TiO2-GO significantly enhanced the CO2 permeation resistance of the PU coating, with the 0.3% content showing the most noticeable improvement. Electrochemical impedance spectroscopy revealed that after immersion in 3.5 wt% NaCl solution, the coating incorporated with TiO2 exhibited highest barrier properties compare with other samples. Meanwhile, the incorporation of TiO2-GO improved the pull-off adhesion and wear resistance of the coating. SEM observations of the exposed coatings showed that the 0.3% TiO2-GO/PU coating had intact surface, confirming its optimal anti-corrosion performance. These improvements were attributed to defect sealing, microcrack suppression, extended diffusion pathways, and the anchoring effect of TiO2 that mitigates GO layer slippage. This study offered a long-term, economical, and efficient anti-corrosion solution in marine environments.