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Abstract <p>The research aims to develop a highly efficient corrosion protection coating with minimal environmental impact using nanoparticles and natural materials. In this study, pomegranate peels extract, chitosan, and 3-aminopropyltriethoxysilane (APTES) (i.e., Pom-Chit-AP) were effectively incorporated for loading onto zeolitic imidazolate framework (ZIF-67). Electrochemical tests revealed that the epoxy coating containing ZIF-67@Pom-Chit-AP outperformed the pure epoxy coating and the epoxy containing only ZIF-67. The corrosion resistance (R<sub>ct</sub>) of the composite coating (i.e., E-ZIF-67@Pom-Chit-AP) after 1 h immersion in 3.5% NaCl solution was 42 kΩ cm<sup>2</sup>, which was significantly higher than the pure epoxy (15 kΩ cm<sup>2</sup>) and ZIF-67 (30 kΩ cm<sup>2</sup>), and after 48 h, it decreased to 38 kΩ cm<sup>2</sup>. Furthermore, in the salt spray test, the E-ZIF-67@Pom-Chit-AP coating showed the best performance, with corrosion limited to less than 1mm at the damaged areas, while the pure epoxy coating exhibited complete delamination and corrosion exceeding 4 mm. These results demonstrate the synergistic effect of combining ZIF-67 and Pom-Chit-AP in enhancing corrosion resistance and creating an active protective layer, making it a green and sustainable solution for protecting metals against corrosion in aggressive environments.</p>

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Smart Epoxy Coatings Reinforced by ZIF-67 Decorated with Pomegranate Peel Extract and Chitosan for Corrosion Protection

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Seyednooroldin Hosseini,
  • Reza Ghamarpoor,
  • Elias Ghaleh Golab,
  • Abdolrahman Obeidavi

摘要

Abstract

The research aims to develop a highly efficient corrosion protection coating with minimal environmental impact using nanoparticles and natural materials. In this study, pomegranate peels extract, chitosan, and 3-aminopropyltriethoxysilane (APTES) (i.e., Pom-Chit-AP) were effectively incorporated for loading onto zeolitic imidazolate framework (ZIF-67). Electrochemical tests revealed that the epoxy coating containing ZIF-67@Pom-Chit-AP outperformed the pure epoxy coating and the epoxy containing only ZIF-67. The corrosion resistance (Rct) of the composite coating (i.e., E-ZIF-67@Pom-Chit-AP) after 1 h immersion in 3.5% NaCl solution was 42 kΩ cm2, which was significantly higher than the pure epoxy (15 kΩ cm2) and ZIF-67 (30 kΩ cm2), and after 48 h, it decreased to 38 kΩ cm2. Furthermore, in the salt spray test, the E-ZIF-67@Pom-Chit-AP coating showed the best performance, with corrosion limited to less than 1mm at the damaged areas, while the pure epoxy coating exhibited complete delamination and corrosion exceeding 4 mm. These results demonstrate the synergistic effect of combining ZIF-67 and Pom-Chit-AP in enhancing corrosion resistance and creating an active protective layer, making it a green and sustainable solution for protecting metals against corrosion in aggressive environments.