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<p>This study evaluated the effectiveness of three compounds, N, N’-bis(3-aminopropyl)piperazine (I1), N, N’-bis(3-(2-thenylidenimino)propyl)piperazine (I2), and its reduced form, N, N’-bis(3-(2-thenylamino)propyl)piperazine (I3), in inhibiting the electrochemical behavior of P460N in a 3.5 wt.&#xa0;% NaCl solution. The concentration range was 0.2 to 2.0&#xa0;mM, and various techniques such as potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), weight loss experiments (WLM), scanning electron microscopy (SEM) images were employed to assess the corrosion of P460N steel in three inhibitors containing solution. The <i>i</i><sub><i>corr</i></sub> values of P460N in solutions with inhibitor were lower when compared to the inhibitor-free solution (79.40 µA.cm<sup>−2</sup>). The highest inhibition efficiency (<i>IE</i>) was observed for I1, I2, and I3 at a concentration of 2.0&#xa0;mM with values of 92.1, 93.7and 93.8%, respectively. The EIS revealed that enhancement in the concentration of inhibitors correlates an increase in the charge transfer resistance from 588 Ω cm<sup>2</sup> for inhibitor-free solution to 1170 (I1), 2470 (I2) and 2540 (I3) Ω cm<sup>2</sup> for 2.0&#xa0;mM inhibitor-containing solution. Based on the PDP, EIS, and SEM images, it was observed that I3 exhibited superior <i>IE</i> when compared to the other two other compounds. The Langmuir isotherm was followed by mixed chemisorption and physisorption processes on the surface of the P460N electrode by all three inhibitors. The experimental results were corroborated by computational chemistry calculations employing density functional theory (DFT) and molecular dynamics (MD) simulations.</p>

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Experimental and Theoretical Insights of Anticorrosive Properties of Some Piperazine-Based Inhibitors for P460N Steel in 3.5 wt. % NaCl Solution

  • 期刊论文

  • 发表日期：

    2025年1月23日

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  • Fayeze Askari,
  • Majid Rezaeivala,
  • Saeid Karimi,
  • Avni Berisha

摘要

This study evaluated the effectiveness of three compounds, N, N’-bis(3-aminopropyl)piperazine (I1), N, N’-bis(3-(2-thenylidenimino)propyl)piperazine (I2), and its reduced form, N, N’-bis(3-(2-thenylamino)propyl)piperazine (I3), in inhibiting the electrochemical behavior of P460N in a 3.5 wt. % NaCl solution. The concentration range was 0.2 to 2.0 mM, and various techniques such as potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), weight loss experiments (WLM), scanning electron microscopy (SEM) images were employed to assess the corrosion of P460N steel in three inhibitors containing solution. The icorr values of P460N in solutions with inhibitor were lower when compared to the inhibitor-free solution (79.40 µA.cm−2). The highest inhibition efficiency (IE) was observed for I1, I2, and I3 at a concentration of 2.0 mM with values of 92.1, 93.7and 93.8%, respectively. The EIS revealed that enhancement in the concentration of inhibitors correlates an increase in the charge transfer resistance from 588 Ω cm2 for inhibitor-free solution to 1170 (I1), 2470 (I2) and 2540 (I3) Ω cm2 for 2.0 mM inhibitor-containing solution. Based on the PDP, EIS, and SEM images, it was observed that I3 exhibited superior IE when compared to the other two other compounds. The Langmuir isotherm was followed by mixed chemisorption and physisorption processes on the surface of the P460N electrode by all three inhibitors. The experimental results were corroborated by computational chemistry calculations employing density functional theory (DFT) and molecular dynamics (MD) simulations.