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<p>The Mannich base corrosion inhibitor CQ-1 was synthesized using cinnamaldehyde, piperazine, and aniline as the primary reagents. The successful synthesis of the product was confirmed by infrared spectroscopy. The corrosion inhibition performance in hydrochloric acid solution was evaluated through weight loss measurements, scanning electron microscopy (SEM), electrochemical polarization, and electrochemical impedance spectroscopy (EIS). The corrosion inhibition mechanism was further validated through molecular simulations and thermodynamic calculations. The results indicated a positive correlation between corrosion rate and inhibitor concentration. At 200°C, with a 6% mass fraction of the inhibitor, the corrosion rate was 61.9961. The polarization curve revealed that the inhibitor behaves as a mixed-type corrosion inhibitor. Thermodynamic calculations were consistent with the Langmuir adsorption model. Molecular dynamics simulations indicated that the CQ-1 inhibitor has a molecular energy gap of 1.815 eV and an adsorption energy of -3436.69 kcal/mol, demonstrating a strong tendency for adsorption on the metal surface and structural stability. Experimental results showed a strong correlation with theoretical findings, providing valuable insights for the development of high-temperature corrosion inhibitors.</p>

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Preparation and Performance Evaluation of the CQ-1 High-Temperature Acid Corrosion Inhibitor

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Chaoqun Xie,
  • Zhifeng Luo,
  • Haoran Fu,
  • Li Shang,
  • Weihua Chen,
  • Jie He,
  • Chaozong Yan

摘要

The Mannich base corrosion inhibitor CQ-1 was synthesized using cinnamaldehyde, piperazine, and aniline as the primary reagents. The successful synthesis of the product was confirmed by infrared spectroscopy. The corrosion inhibition performance in hydrochloric acid solution was evaluated through weight loss measurements, scanning electron microscopy (SEM), electrochemical polarization, and electrochemical impedance spectroscopy (EIS). The corrosion inhibition mechanism was further validated through molecular simulations and thermodynamic calculations. The results indicated a positive correlation between corrosion rate and inhibitor concentration. At 200°C, with a 6% mass fraction of the inhibitor, the corrosion rate was 61.9961. The polarization curve revealed that the inhibitor behaves as a mixed-type corrosion inhibitor. Thermodynamic calculations were consistent with the Langmuir adsorption model. Molecular dynamics simulations indicated that the CQ-1 inhibitor has a molecular energy gap of 1.815 eV and an adsorption energy of -3436.69 kcal/mol, demonstrating a strong tendency for adsorption on the metal surface and structural stability. Experimental results showed a strong correlation with theoretical findings, providing valuable insights for the development of high-temperature corrosion inhibitors.