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<p>In acidization of petroleum and natural gas exploitation, corrosion prevention of pipeline is very important, especially at high temperature and pressure conditions. Adding highly efficient corrosion inhibitor is the most commonly used countermeasure. In this paper, the synergistic inhibition effect of quinoline quaternary ammonium salt (QQ) and Sb<sub>2</sub>O<sub>3</sub> as corrosion inhibitor of N80 steel was investigated in 20% HCl solution at 140&#xa0;°C. Weight loss and in situ electrochemical results demonstrated that there existed remarkable synergistic inhibition effect between QQ and Sb<sub>2</sub>O<sub>3</sub>. In situ measurements showed that with the presence of QQ and Sb<sub>2</sub>O<sub>3</sub>, OCP shifted negatively. EIS revealed that charge-transfer resistance increased with the increase in Sb<sub>2</sub>O<sub>3</sub> content. And PC results showed that corrosion current density, <i>i</i><sub>corr</sub>, also decreased with the increase in Sb<sub>2</sub>O<sub>3</sub> content. The mechanism of inhibition synergistic effect was also proposed by analysis of the protective layer of corrosion inhibitors with SEM, EDS, XRD, ATR-FTIR and contact angle measurements. A coordination compound [2Sb<sup>3+</sup>·C<sub>9</sub>H<sub>7</sub>N] adsorbed on N80 steel surface and the consequent reduction of Sb<sup>3+</sup> resulted in complex inhibitor layer of QQ and elemental Sb.</p>

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Synergistic Inhibition Effect of Quinoline Quaternary Ammonium Salt and Sb2O3 as Corrosion Inhibitor for High Temperature Acidization

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • Yuan Lu

摘要

In acidization of petroleum and natural gas exploitation, corrosion prevention of pipeline is very important, especially at high temperature and pressure conditions. Adding highly efficient corrosion inhibitor is the most commonly used countermeasure. In this paper, the synergistic inhibition effect of quinoline quaternary ammonium salt (QQ) and Sb2O3 as corrosion inhibitor of N80 steel was investigated in 20% HCl solution at 140 °C. Weight loss and in situ electrochemical results demonstrated that there existed remarkable synergistic inhibition effect between QQ and Sb2O3. In situ measurements showed that with the presence of QQ and Sb2O3, OCP shifted negatively. EIS revealed that charge-transfer resistance increased with the increase in Sb2O3 content. And PC results showed that corrosion current density, icorr, also decreased with the increase in Sb2O3 content. The mechanism of inhibition synergistic effect was also proposed by analysis of the protective layer of corrosion inhibitors with SEM, EDS, XRD, ATR-FTIR and contact angle measurements. A coordination compound [2Sb3+·C9H7N] adsorbed on N80 steel surface and the consequent reduction of Sb3+ resulted in complex inhibitor layer of QQ and elemental Sb.