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<p>As the load on oil and gas pipelines increases, corrosion and wear of the inner walls have become more severe, posing a significant threat to pipeline safety. Epoxy resin (EP) is widely used in pipeline protective coatings due to its cost-effectiveness and excellent wear and corrosion resistance. However, during the curing process, EP tends to form micropores and internal stresses, limiting its long-term performance under complex conditions. To enhance the overall performance of EP coatings, Fe<sub>3</sub>O<sub>4</sub> nanoparticles were surface-modified with APTES silane coupling agent and anchored onto graphene oxide (GO) sheets, forming Fe<sub>3</sub>O<sub>4</sub>–GO hybrid materials as functional fillers in EP. The wear and corrosion resistance of the coatings were systematically evaluated through dispersion stability, microhardness, friction-wear tests, water absorption, contact angle, and electrochemical testing. The results showed that Fe<sub>3</sub>O<sub>4</sub>–GO dispersed well in EP, and the average friction coefficient and volume wear rate of the Fe<sub>3</sub>O<sub>4</sub>–GO/EP composite coating were 0.64 and 24.21 × 10<sup>−5</sup> mm<sup>3</sup>/(N·m), respectively, which were 8.5% and 68.14% lower than those of pure EP. After 21&#xa0;days of immersion in 3.5 wt% NaCl solution, the |<i>Z</i>|<sub>0.01&#xa0;Hz</sub> of the composite coating remained at 2.11 × 10<sup>5</sup>&#xa0;Ω·cm<sup>2</sup> with the lowest corrosion rate, confirming its excellent corrosion resistance.</p>

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Engineering APTES-modified Fe3O4–GO hybrid fillers for enhanced wear and corrosion resistance in epoxy pipeline coatings

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Dinghao Sun,
  • Tong Lin,
  • Rong Du,
  • Jin Zhang,
  • Haibo Wang,
  • Qingzhu Sun,
  • Zhiyuan Ma,
  • Songxia Li

摘要

As the load on oil and gas pipelines increases, corrosion and wear of the inner walls have become more severe, posing a significant threat to pipeline safety. Epoxy resin (EP) is widely used in pipeline protective coatings due to its cost-effectiveness and excellent wear and corrosion resistance. However, during the curing process, EP tends to form micropores and internal stresses, limiting its long-term performance under complex conditions. To enhance the overall performance of EP coatings, Fe3O4 nanoparticles were surface-modified with APTES silane coupling agent and anchored onto graphene oxide (GO) sheets, forming Fe3O4–GO hybrid materials as functional fillers in EP. The wear and corrosion resistance of the coatings were systematically evaluated through dispersion stability, microhardness, friction-wear tests, water absorption, contact angle, and electrochemical testing. The results showed that Fe3O4–GO dispersed well in EP, and the average friction coefficient and volume wear rate of the Fe3O4–GO/EP composite coating were 0.64 and 24.21 × 10−5 mm3/(N·m), respectively, which were 8.5% and 68.14% lower than those of pure EP. After 21 days of immersion in 3.5 wt% NaCl solution, the |Z|0.01 Hz of the composite coating remained at 2.11 × 105 Ω·cm2 with the lowest corrosion rate, confirming its excellent corrosion resistance.