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<p>The as-prepared ZIF-7 and ZIF-7@GO was introduced into 3.5&#xa0;wt.% NaCl solution with varying pH values. Ultraviolet-visible (UV–Vis) spectroscopic analysis revealed that the release kinetics of organic ligands from the composite were significantly accelerated with decreasing pH value. Furthermore, the corresponding electrochemical impedance spectroscopy (EIS) results demonstrated that the benzimidazole (BIM) exhibited remarkable inhibition properties. Later, ZIF-7@GO was incorporated into epoxy resin at varying weight percentages, with systematic evaluations of hydrophobicity, adhesion strength, and EIS performance revealing that ZIF-7@GO/EP(1%) delivered optimal coating performance. After 30&#xa0;days of immersion in 3.5&#xa0;wt.% NaCl solution, the low-frequency impedance modulus (|Z|<sub>0.01Hz</sub>) of ZIF-7@GO/EP(1%) remained above 1 × 10<sup>10</sup>&#xa0;Ω·cm<sup>2</sup>. This work establishes a novel paradigm for designing self-healing organic coatings tailored for harsh marine environments.</p>

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Release of BIM from ZIF-7@GO and its effect on the anti-corrosion performance of epoxy composite coating

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • Yiming Zhou,
  • Xiaoqing Chen,
  • Ming Zhang,
  • Zhaolei Li,
  • Lizhuang Chen

摘要

The as-prepared ZIF-7 and ZIF-7@GO was introduced into 3.5 wt.% NaCl solution with varying pH values. Ultraviolet-visible (UV–Vis) spectroscopic analysis revealed that the release kinetics of organic ligands from the composite were significantly accelerated with decreasing pH value. Furthermore, the corresponding electrochemical impedance spectroscopy (EIS) results demonstrated that the benzimidazole (BIM) exhibited remarkable inhibition properties. Later, ZIF-7@GO was incorporated into epoxy resin at varying weight percentages, with systematic evaluations of hydrophobicity, adhesion strength, and EIS performance revealing that ZIF-7@GO/EP(1%) delivered optimal coating performance. After 30 days of immersion in 3.5 wt.% NaCl solution, the low-frequency impedance modulus (|Z|0.01Hz) of ZIF-7@GO/EP(1%) remained above 1 × 1010 Ω·cm2. This work establishes a novel paradigm for designing self-healing organic coatings tailored for harsh marine environments.