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<p>A pH-responsive protection coating capable of multiple repair cycles was fabricated by introduction of a functional silica microtubules (T-mSiO<sub>2</sub>). Chitosan-polyethylene glycol polymer (CP), serving as a response switch, was grafted onto T-mSiO<sub>2</sub>, with sodium phytate (PA) as the encapsulated inhibitor. FTIR, SEM, TG, and EDS tests confirmed the successful encapsulation of PA within T-mSiO<sub>2</sub> and the grafting of CP onto its surface. Upon coating damage, T-mSiO<sub>2</sub> releases PA in response to micro-pH changes, forming a protective film to achieve self-healing. Post-repair, CP re-covers T-mSiO<sub>2</sub> to prevent rapid PA depletion. By modifying the functional nanocontainer, the protective efficacy of the corrosion inhibitor was significantly enhanced, thereby prolonging the coating’s service life.</p>

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pH-Responsive Coating with Multiple Self-healing Cycles Using T-mSiO2 Loaded Sodium Phytate and Grafted Chitosan-PEG

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Liying Song,
  • Jiankai Zhang,
  • Yuxuan Bai,
  • Haoran Zhang,
  • Runyuan Liu,
  • Menglong Zhang,
  • Tangsen Yuan,
  • Hao Shi,
  • Fubin Ma

摘要

A pH-responsive protection coating capable of multiple repair cycles was fabricated by introduction of a functional silica microtubules (T-mSiO2). Chitosan-polyethylene glycol polymer (CP), serving as a response switch, was grafted onto T-mSiO2, with sodium phytate (PA) as the encapsulated inhibitor. FTIR, SEM, TG, and EDS tests confirmed the successful encapsulation of PA within T-mSiO2 and the grafting of CP onto its surface. Upon coating damage, T-mSiO2 releases PA in response to micro-pH changes, forming a protective film to achieve self-healing. Post-repair, CP re-covers T-mSiO2 to prevent rapid PA depletion. By modifying the functional nanocontainer, the protective efficacy of the corrosion inhibitor was significantly enhanced, thereby prolonging the coating’s service life.