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<p>To address the poor dispersibility of conventional zinc oxide in anti-corrosion applications and optimize its band structure and electron capture efficiency, N-ZnO is employed as an active filler in this study. Subsequently, the biomimetic polydopamine (PDA) was successfully structured on nitrogen-doped zinc oxide (N-ZnO) by the in situ self-polymerization of dopamine (DA). The encapsulation of PDA has been confirmed by the analysis of phase structure, morphology, and surface properties. The electrochemical impedance spectroscopy (EIS) test indicated that an appropriate PDA layer can significantly improve the anti-corrosion performance of N-ZnO, among which the N-ZnO@PDA-1.05/epoxy resin coating showed the best anti-corrosion performance, exhibiting a 230.16% higher total impedance value than the blank/epoxy resin coating. The linear structured N-ZnO@PDA, which is bridged by the hydrogen bonding and conjugation effect between PDA, creates a “labyrinth effect” and prolongs the penetration path of corrosive media. The abundant reactive functional groups in PDA not only enable PDA to adhere to N-ZnO but also cross-link with epoxy resins, significantly enhancing the coating’s barrier properties and structural compactness. Furthermore, PDA’s potent chelating ability facilitates the rapid formation of PDA-Fe chelates once corrosion initiates, effectively repairing cracks and isolating damaged areas from the corrosive environment. This study provides new ideas and an experimental basis for the biomimetic modification of nanofillers and the design of high-performance intelligent anti-corrosion coatings.</p>

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In situ synthesis and enhanced anti-corrosion properties of N-ZnO@polydopamine composite

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Feng-Rui Wang,
  • Yuan Ma,
  • Wen-Jing Zhang,
  • Hui-Ping Sun,
  • Ruo-Yu Zheng,
  • Jin-Ku Liu

摘要

To address the poor dispersibility of conventional zinc oxide in anti-corrosion applications and optimize its band structure and electron capture efficiency, N-ZnO is employed as an active filler in this study. Subsequently, the biomimetic polydopamine (PDA) was successfully structured on nitrogen-doped zinc oxide (N-ZnO) by the in situ self-polymerization of dopamine (DA). The encapsulation of PDA has been confirmed by the analysis of phase structure, morphology, and surface properties. The electrochemical impedance spectroscopy (EIS) test indicated that an appropriate PDA layer can significantly improve the anti-corrosion performance of N-ZnO, among which the N-ZnO@PDA-1.05/epoxy resin coating showed the best anti-corrosion performance, exhibiting a 230.16% higher total impedance value than the blank/epoxy resin coating. The linear structured N-ZnO@PDA, which is bridged by the hydrogen bonding and conjugation effect between PDA, creates a “labyrinth effect” and prolongs the penetration path of corrosive media. The abundant reactive functional groups in PDA not only enable PDA to adhere to N-ZnO but also cross-link with epoxy resins, significantly enhancing the coating’s barrier properties and structural compactness. Furthermore, PDA’s potent chelating ability facilitates the rapid formation of PDA-Fe chelates once corrosion initiates, effectively repairing cracks and isolating damaged areas from the corrosive environment. This study provides new ideas and an experimental basis for the biomimetic modification of nanofillers and the design of high-performance intelligent anti-corrosion coatings.