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<p>Organic–inorganic coatings play an essential role in physical barriers and corrosion inhibition between metal substrates and corrosive electrolytes. However, its corrosion protection efficiency is still low due to the limited types of suitable fillers available. This study reports on aluminum-rich epoxy–polyester powder (ALREPP) coatings with enhanced anti-corrosion and cathodic protection performance achieved via graphene oxide nanosheets and silica/graphene oxide nanoparticles, which improve adhesion and filler dispersibility within the coating matrix. This approach offers a promising solution for corrosion protection in metal structures used in marine, automotive, and industrial environments. Thus, graphene oxide (GO) was prepared from natural graphite powder using a modified Hummer’s method, and SiO<sub>2</sub>-GO was prepared by in-situ hydrolysis of TEOS through a one-step sol–gel method. The essential structures and morphologies of the ALREPP, GO, and SiO<sub>2</sub>-GO were revealed by FESEM analysis, and the results from electrochemical measurements were examined using open-circuit potential (OCP), Tafel polarization, and electrochemical impedance spectroscopy (EIS) in a 3.5&#xa0;wt.% NaCl solution for different immersion times. As manifested by the results, the nanocomposite coating of 0.5 wt.% SiO<sub>2</sub>-GO/2 wt.% ALREPP exhibited better cathodic protection performance than pure epoxy–polyester (EPP). Furthermore, SiO<sub>2</sub>-GO/ALREPP coating has a significant effect in increasing the corrosion protection efficiency up to 95.7% after a 1-month immersion time.</p>

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Influence of Silicon–Graphene Oxide Nanoparticles Added Aluminum-Rich Epoxy Powder Coatings for Enhanced Cathodic Protection Efficiency in Saline Immersion

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Dina R. Rzaij,
  • Ebrahim Mahmoudi,
  • Ng law Yong,
  • Alireza Nouri,
  • Ang Wei Lun,
  • Abdul Wahab Mohammad,
  • M. F. Mohd Razip Wee,
  • Hussein Ali Hussein,
  • Nili Mastura Binti Munir

摘要

Organic–inorganic coatings play an essential role in physical barriers and corrosion inhibition between metal substrates and corrosive electrolytes. However, its corrosion protection efficiency is still low due to the limited types of suitable fillers available. This study reports on aluminum-rich epoxy–polyester powder (ALREPP) coatings with enhanced anti-corrosion and cathodic protection performance achieved via graphene oxide nanosheets and silica/graphene oxide nanoparticles, which improve adhesion and filler dispersibility within the coating matrix. This approach offers a promising solution for corrosion protection in metal structures used in marine, automotive, and industrial environments. Thus, graphene oxide (GO) was prepared from natural graphite powder using a modified Hummer’s method, and SiO2-GO was prepared by in-situ hydrolysis of TEOS through a one-step sol–gel method. The essential structures and morphologies of the ALREPP, GO, and SiO2-GO were revealed by FESEM analysis, and the results from electrochemical measurements were examined using open-circuit potential (OCP), Tafel polarization, and electrochemical impedance spectroscopy (EIS) in a 3.5 wt.% NaCl solution for different immersion times. As manifested by the results, the nanocomposite coating of 0.5 wt.% SiO2-GO/2 wt.% ALREPP exhibited better cathodic protection performance than pure epoxy–polyester (EPP). Furthermore, SiO2-GO/ALREPP coating has a significant effect in increasing the corrosion protection efficiency up to 95.7% after a 1-month immersion time.