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<p>This study aims to evaluate the effectiveness of orange peel water extract (OPWE) as a green, sustainable biodegradable corrosion inhibitor with excellent inhibition action for low carbon steel (LCS) in three different media: 0.5&#xa0;M H<sub>2</sub>SO<sub>4</sub>, CaCl<sub>2</sub> acidified by 0.5&#xa0;M H<sub>2</sub>SO<sub>4</sub>, and natural seawater acidified by 0.5&#xa0;M H<sub>2</sub>SO<sub>4</sub>. This study also investigates the inhibition effect of OPWE as a cheap, raw and nontoxic corrosion inhibitor on the LCS at varying temperatures and inhibitor concentrations. These media are typically used for acid cleaning in multistage flash distillation plants (MSF). The study used various techniques, such as gravimetric (weight loss and inductively coupled plasma (ICP)), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization techniques, to analyze the results. The analysis was done using Gamry Echemanalyt. The results obtained by these techniques showed that OPWE was an effective corrosion inhibitor for LCS in all three media, with an inhibition efficiency of approximately 75% at 0.4&#xa0;g L<sup>–1</sup> increased to 87% in the presence of 10<sup>–4</sup>&#xa0;M KI. The study also investigated the effect of temperature in the 30–60&#xa0;°C range on the corrosion of LCS in the three tested media. The inhibitive efficiencies of OPWE increase with a rise of temperature in the three tested media and become 89%, 93% and 88% for LCS in 0.5M sulphuric acid, CaCl<sub>2</sub> brine and seawater acidified by 0.5 M H<sub>2</sub>SO<sub>4</sub>, respectively. The <i>ΔH°</i> was positive values indicating that the adsorption of OPWE molecules is an endothermic process. The values of <i>ΔS°</i> in the presence of OPWE are small and positive, indicating a decrease in disordering in going from the system to the complexation reaction. Tafel’s behavior led to the shift of the corrosion potential to the less harmful potential, which did not reach ± 85 mv, indicating that OPWE acts as a mixed-type inhibitor. Also, the diameter of the semicircle increases, showing the more inhibitory effects of OPWE. The researchers obtained the adsorption parameters by fitting the experimental data to the Langmuir, Temkin, Flory, and Frumkin kinetic-thermodynamic models.</p>

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Natural Biodegradable Inhibitor to Prevent Corrosion of Low Carbon Steel (LCS) in Multistage Flash Distillation Plant

  • 期刊论文

  • 发表日期：

    2025年5月2日

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  • Nehal A. Barghout,
  • Murat Yilmaz,
  • B. A. Abd-El-Nabey,
  • H. A. Fetouh,
  • Safaa Ragab,
  • Ahmed El Nemr

摘要

This study aims to evaluate the effectiveness of orange peel water extract (OPWE) as a green, sustainable biodegradable corrosion inhibitor with excellent inhibition action for low carbon steel (LCS) in three different media: 0.5 M H2SO4, CaCl2 acidified by 0.5 M H2SO4, and natural seawater acidified by 0.5 M H2SO4. This study also investigates the inhibition effect of OPWE as a cheap, raw and nontoxic corrosion inhibitor on the LCS at varying temperatures and inhibitor concentrations. These media are typically used for acid cleaning in multistage flash distillation plants (MSF). The study used various techniques, such as gravimetric (weight loss and inductively coupled plasma (ICP)), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization techniques, to analyze the results. The analysis was done using Gamry Echemanalyt. The results obtained by these techniques showed that OPWE was an effective corrosion inhibitor for LCS in all three media, with an inhibition efficiency of approximately 75% at 0.4 g L–1 increased to 87% in the presence of 10–4 M KI. The study also investigated the effect of temperature in the 30–60 °C range on the corrosion of LCS in the three tested media. The inhibitive efficiencies of OPWE increase with a rise of temperature in the three tested media and become 89%, 93% and 88% for LCS in 0.5M sulphuric acid, CaCl2 brine and seawater acidified by 0.5 M H2SO4, respectively. The ΔH° was positive values indicating that the adsorption of OPWE molecules is an endothermic process. The values of ΔS° in the presence of OPWE are small and positive, indicating a decrease in disordering in going from the system to the complexation reaction. Tafel’s behavior led to the shift of the corrosion potential to the less harmful potential, which did not reach ± 85 mv, indicating that OPWE acts as a mixed-type inhibitor. Also, the diameter of the semicircle increases, showing the more inhibitory effects of OPWE. The researchers obtained the adsorption parameters by fitting the experimental data to the Langmuir, Temkin, Flory, and Frumkin kinetic-thermodynamic models.