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<p>Inconel 792 is a high-performance superalloy widely used in power generation systems, yet it remains vulnerable to corrosion under specific environmental conditions. This study presents the synthesis of a TiO<sub>2</sub>–graphene oxide (GO) nanocomposite coating on Inconel 792 via pulse electrodeposition. Process parameters—deposition cycles, anodic current density, and TiO<sub>2</sub> concentration—were optimized using response surface methodology (RSM) to achieve a uniform surface. Characterization results indicated that sub-10&#xa0;nm TiO<sub>2</sub> nanoparticles were uniformly distributed on the GO sheets with close interfacial contact, which contributed to improved dispersion. Electrochemical tests revealed a significant enhancement in corrosion resistance: the optimized coating shifted the corrosion potential (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:{E}_{corr}\)</EquationSource> </InlineEquation>) positively from − 0.096 to − 0.050&#xa0;V and reduced the corrosion current density (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:{i}_{corr}\)</EquationSource> </InlineEquation>) from 15.68&#xa0;to 0.70 µA/cm<sup>2</sup>. Consequently, the polarization resistance (R<sub>pol</sub>) increased approximately 16.46-times compared to the uncoated substrate, confirming the superior protective capabilities of the TiO<sub>2</sub>–GO nanocomposite against electrochemical degradation.</p>

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Pulse Electrodeposition of TiO2–Graphene Oxide Coatings on Inconel 792: RSM Optimization for Enhanced Corrosion Resistance

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Mahdieh Khosravi Khezri,
  • Alireza Afsari Moghaddam,
  • Seyed Yousef Ahmadi-Brooghani,
  • Yadollah Yaghoubinezhad

摘要

Inconel 792 is a high-performance superalloy widely used in power generation systems, yet it remains vulnerable to corrosion under specific environmental conditions. This study presents the synthesis of a TiO2–graphene oxide (GO) nanocomposite coating on Inconel 792 via pulse electrodeposition. Process parameters—deposition cycles, anodic current density, and TiO2 concentration—were optimized using response surface methodology (RSM) to achieve a uniform surface. Characterization results indicated that sub-10 nm TiO2 nanoparticles were uniformly distributed on the GO sheets with close interfacial contact, which contributed to improved dispersion. Electrochemical tests revealed a significant enhancement in corrosion resistance: the optimized coating shifted the corrosion potential ( \(\:{E}_{corr}\) ) positively from − 0.096 to − 0.050 V and reduced the corrosion current density ( \(\:{i}_{corr}\) ) from 15.68 to 0.70 µA/cm2. Consequently, the polarization resistance (Rpol) increased approximately 16.46-times compared to the uncoated substrate, confirming the superior protective capabilities of the TiO2–GO nanocomposite against electrochemical degradation.