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The increasing demand for sustainable and efficient corrosion control strategies has highlighted the potential of ionic liquidsIonic liquid as alternative inhibitors due to their excellent properties. This study investigated the corrosion inhibition performance of tetramethylammonium iodideTetramethylammonium iodide (TMAI) for UNS S31803 duplex stainless steelDuplex stainless steel in 1 M HCl solution. Potentiodynamic polarization tests demonstrated that TMAI significantly reduced the corrosion current density, reaching a maximum inhibition efficiency of 88.1% at 40 °C with a concentration of 5 mM. A modest efficiency reduction was observed at 50 °C, suggesting a decrease in protective layer stability at elevated temperatures. SEMScanning Electron Microscopy (SEM) analysis revealed a smoother surfaceSurface in the presence of the inhibitor, while EDS confirmed the adsorption of TMAI through the detection of characteristic elements. The adsorption behavior followed the Langmuir isothermIsotherms. These results demonstrate the effectiveness of TMAI as a corrosion inhibitorCorrosion inhibitor and reinforce the potential of ionic liquidsIonic liquid for use in aggressive industrial environments.

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Study of the Efficiency of Tetramethylammonium Iodide as a Corrosion Inhibitor for UNS S31803 Duplex Stainless Steel in Hydrochloric Acid Solution

  • 会议论文

  • 发表日期：

    2026年

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  • Anderson Oliveira Gadioli,
  • Sthefanie de Carvalho Mendes Lopes,
  • Maria de Lourdes Soprani Vasconcellos,
  • Lucas Menezes Souza,
  • Afonso R. G. Azevedo,
  • Elaine C. Pereira

摘要

The increasing demand for sustainable and efficient corrosion control strategies has highlighted the potential of ionic liquidsIonic liquid as alternative inhibitors due to their excellent properties. This study investigated the corrosion inhibition performance of tetramethylammonium iodideTetramethylammonium iodide (TMAI) for UNS S31803 duplex stainless steelDuplex stainless steel in 1 M HCl solution. Potentiodynamic polarization tests demonstrated that TMAI significantly reduced the corrosion current density, reaching a maximum inhibition efficiency of 88.1% at 40 °C with a concentration of 5 mM. A modest efficiency reduction was observed at 50 °C, suggesting a decrease in protective layer stability at elevated temperatures. SEMScanning Electron Microscopy (SEM) analysis revealed a smoother surfaceSurface in the presence of the inhibitor, while EDS confirmed the adsorption of TMAI through the detection of characteristic elements. The adsorption behavior followed the Langmuir isothermIsotherms. These results demonstrate the effectiveness of TMAI as a corrosion inhibitorCorrosion inhibitor and reinforce the potential of ionic liquidsIonic liquid for use in aggressive industrial environments.