Akademik Veri Yönetim Sistemi
Journal of Polymer Research, cilt.33, sa.4, 2026 (SCI-Expanded, Scopus)
This study presents a comparative investigation of graphene oxide (GO) and 3-aminopropyltriethoxysilane (APTES)-functionalized graphene oxide (fGO) reinforced polyethersulfone (PES) coatings for corrosion protection of Al2024-T3 alloy. GO was synthesized using a modified Hummers method and subsequently functionalized with APTES. Nanocomposite coatings containing 0.2, 0.6, and 0.8 wt% GO or fGO were prepared in a PES matrix and deposited onto Al2024-T3 substrates by dip-coating. Structural, thermal, and surface properties of the coatings were characterized using FTIR, XRD, TGA–DTA, AFM, and contact angle measurements. Corrosion protection performance was evaluated by electrochemical impedance spectroscopy (EIS) in 0.5 M NaCl solution after immersion periods of 1 h, 1 day, and 2 days. All PES-based coatings significantly improved the corrosion resistance of Al2024-T3 compared with the uncoated alloy. Among all samples, pristine PES exhibited the highest overall corrosion resistance due to the formation of a dense and intrinsically hydrophobic polymer barrier. The incorporation of GO decreased corrosion resistance with increasing filler loading, which is attributed to agglomeration and increased electrolyte diffusion pathways. In contrast, fGO incorporation improved dispersion and provided better corrosion resistance than GO at comparable loadings, particularly at higher fGO concentrations. The results demonstrate that although graphene oxide functionalization improves coating integrity compared with GO, pristine PES remained the most effective barrier coating under the studied conditions, exhibiting a charge transfer resistance of 37.6 MΩ·cm² after 48 h immersion. These findings provide mechanistic insight into the role of graphene oxide functionalization in PES-based anticorrosion coatings for aluminum alloys.