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<p><i>Cuminum cyminum</i> extract (CCE) has been studied as a corrosion inhibitor in controlling corrosion of C-steel corrosion in 0.5&#xa0;M H<sub>2</sub>SO<sub>4</sub>, by weight loss (WL), potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), energy-dispersive X-ray spectroscopy, scanning electron microscopy (SEM), and atomic force microscopy (AFM) measurements. The findings demonstrated that inhibition efficiency (% IE) enhanced with increasing extract dosages, attaining 83.49% at 200 ppm and finishing at 91.83% at 400 ppm. However, inhibition efficiency was reduced by raising the temperature, decreasing from 91.83% at 298&#xa0;K to 78.63% at 318&#xa0;K (all at 400 ppm). CCE adhered to the C-steel surface by the Langmuir adsorption isotherm. EIS measurements exhibited increased transfer resistance (R<sub>ct</sub>) as the extract dose increased. Polarization curves showed that CCE functions as a mixed-type inhibitor. Several thermodynamic parameters were computed and examined. The free energy of adsorption for the extract under study was calculated and was found 34.7–35.8&#xa0;kJ mol<sup>− 1</sup>. Chemical and electrochemical approaches yielded reliable and agreeable results.</p>

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Cuminum cyminum as green corrosion inhibitor for API 5 L X70 carbon steel in 0.5 M H2SO4 solution

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月17日

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  • A. S. Fouda,
  • S. Rashwan,
  • H. Ibrahim,
  • M. Reda,
  • M. E. Eissa,
  • A. El-Hossiany

摘要

Cuminum cyminum extract (CCE) has been studied as a corrosion inhibitor in controlling corrosion of C-steel corrosion in 0.5 M H2SO4, by weight loss (WL), potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), energy-dispersive X-ray spectroscopy, scanning electron microscopy (SEM), and atomic force microscopy (AFM) measurements. The findings demonstrated that inhibition efficiency (% IE) enhanced with increasing extract dosages, attaining 83.49% at 200 ppm and finishing at 91.83% at 400 ppm. However, inhibition efficiency was reduced by raising the temperature, decreasing from 91.83% at 298 K to 78.63% at 318 K (all at 400 ppm). CCE adhered to the C-steel surface by the Langmuir adsorption isotherm. EIS measurements exhibited increased transfer resistance (Rct) as the extract dose increased. Polarization curves showed that CCE functions as a mixed-type inhibitor. Several thermodynamic parameters were computed and examined. The free energy of adsorption for the extract under study was calculated and was found 34.7–35.8 kJ mol− 1. Chemical and electrochemical approaches yielded reliable and agreeable results.