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<p>In current study, <i>Echinops</i> plant extract was examined as a green inhibitor in 1&#xa0;M sulfuric acid on SS316 stainless steel. Regarding the total phenolic and flavonoid composition determined by LC-MS analysis, succinic acid (279.88&#xa0;mg/L) and rosmarinic acid (103.53&#xa0;mg/L) were found to be the extract’s two main constituents of extract. In addition, at a concentration of 200 ppm of inhibitor, the anti-corrosion ability of <i>Echinops</i> plant extract on SS316 stainless steel exhibited a maximum inhibition efficiency of 85.86%. The SEM-EDS observations validated that the inhibitor had created a productive layer on the SS316. Furthermore, to verify the anti-corrosion performance of the plant extract, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization experiments were performed. The calculated <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({{\Delta\:}G}_{ads}^{0}\)</EquationSource> </InlineEquation> value (− 28.06&#xa0;kJ/mol) confirmed a spontaneous mixed chemical and physical adsorption of <i>Echinops</i> extract compounds on the metal surface.</p>

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Evaluation of Echinops Plant Extract as a Green Corrosion Inhibitor for SS316 in H2SO4 Solution

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Yacine Hafad,
  • Abdelkader Benmenine,
  • Lyamine Messaadia,
  • Doğan Cirmi,
  • Aya Alterkaoui,
  • Oltan Canli,
  • Nadir Dizge

摘要

In current study, Echinops plant extract was examined as a green inhibitor in 1 M sulfuric acid on SS316 stainless steel. Regarding the total phenolic and flavonoid composition determined by LC-MS analysis, succinic acid (279.88 mg/L) and rosmarinic acid (103.53 mg/L) were found to be the extract’s two main constituents of extract. In addition, at a concentration of 200 ppm of inhibitor, the anti-corrosion ability of Echinops plant extract on SS316 stainless steel exhibited a maximum inhibition efficiency of 85.86%. The SEM-EDS observations validated that the inhibitor had created a productive layer on the SS316. Furthermore, to verify the anti-corrosion performance of the plant extract, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization experiments were performed. The calculated \({{\Delta\:}G}_{ads}^{0}\) value (− 28.06 kJ/mol) confirmed a spontaneous mixed chemical and physical adsorption of Echinops extract compounds on the metal surface.