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<p>Corrosion is one of the major challenges in industries. This study used Box Behnken Design (BBD) to examine the effectiveness of eggshell extract as green inhibitor. Physicochemical analysis was done to determine the major physicochemical constituents. The process variables optimised study were: eggshell extract (0.2–0.8&#xa0;g/L), immersion time (3–12 days) and temperature (30–60&#xa0;°C). Characterization was done using Fourier Transform Infrared Spectroscopy (FT-IR); Scanning Electron microscope (SEM). Polarization study was used to determine type of inhibitor. The best process level was 7.5, 0.8&#xa0;g/L, 30&#xa0;°C, with corrosion rate of 0.00000049&#xa0;mm/yr; while 0.00000219&#xa0;mm/yr at: 9 days, 0.8&#xa0;g/L at 35.5 ℃ was observed at optimal process level (validated). The FTIR and SEM showed that mild steel from validated experiment had higher adsorption, with more protective layer formed due to presence of more heteroatoms. Polarization study showed that the extract was a mixed-type inhibitor. The results of physicochemical, Polarization, FTIR and SEM analyses supported the findings that eggshell extract can reduce corrosion rate by adsorption on the metal surface.</p>

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Inhibition of mild steel corrosion in 0.5 M HCl medium using eggshell extract: experimental, electrochemical and optimization studies

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月20日

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  • Olamide Olawale,
  • John Busayo Adeoye,
  • Andrew Akinmoladun,
  • Grace Ogbene Lawani,
  • Zack Horo-Horo,
  • Siji Tunbosun Abayomi

摘要

Corrosion is one of the major challenges in industries. This study used Box Behnken Design (BBD) to examine the effectiveness of eggshell extract as green inhibitor. Physicochemical analysis was done to determine the major physicochemical constituents. The process variables optimised study were: eggshell extract (0.2–0.8 g/L), immersion time (3–12 days) and temperature (30–60 °C). Characterization was done using Fourier Transform Infrared Spectroscopy (FT-IR); Scanning Electron microscope (SEM). Polarization study was used to determine type of inhibitor. The best process level was 7.5, 0.8 g/L, 30 °C, with corrosion rate of 0.00000049 mm/yr; while 0.00000219 mm/yr at: 9 days, 0.8 g/L at 35.5 ℃ was observed at optimal process level (validated). The FTIR and SEM showed that mild steel from validated experiment had higher adsorption, with more protective layer formed due to presence of more heteroatoms. Polarization study showed that the extract was a mixed-type inhibitor. The results of physicochemical, Polarization, FTIR and SEM analyses supported the findings that eggshell extract can reduce corrosion rate by adsorption on the metal surface.