Abstract
The present work demonstrates the as-prepared silver (Ag)-decorated reduced graphene oxide (rGO) nanohybrid–sulfonated polyaniline (SPANI) as a highly efficient anti-corrosion coating material for mild steel (MS) corrosion. In this direction, graphene oxide (GO), rGO-Ag and rGO-Ag-SPANI were synthesized and characterized by Fourier transform infrared (FT-IR), x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectral studies. Different weight ratios of rGO-Ag and SPANI were dispersed in epoxy (EP) resin and coated on the MS surface by spin coating technique. The coated nanocomposites were examined by SEM, atomic force microscopy (AFM) and contact angle analyses. Electrochemical corrosion measurements of different compositions rGO-Ag and SPANI were carried out to analyze the influence of rGO-Ag-SPANI nanofiller in enhancing the anti-corrosion and barrier properties of EP resin. Results indicate that 1:2 composition of rGO-Ag and SPANI-dispersed epoxy coating (GASP-3) showed good corrosion protection against the corrosive electrolyte, and the value of |Z|0.01 Hz was found to be in the order of 106 Ω cm2. Further, the highest contact angle value of 93.4° in GASP-3 coating substantiates the electrochemical results. This could be ascribed due to the presence of more SPANI molecules in the coating matrix which effectively block the passage of corrosive electrolytes through the micropores of epoxy resin.
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Nayak, S.R., Mohana, K.N.S., Rajitha, K. et al. Silver-Decorated Reduced Graphene Oxide–Sulfonated Polyaniline Ternary Nanocomposite: A Highly Reliable Anti-Corrosion Coating Material for Mild Steel. J. of Materi Eng and Perform (2023). https://doi.org/10.1007/s11665-023-08796-3
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DOI: https://doi.org/10.1007/s11665-023-08796-3