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<p>In this work, three types of amino acids with different functional groups were selected, that is, <span>l</span>-methionine (Met), <span>l</span>-arginine (Arg), and <span>l</span>-aspartic acid (Asp). The synergistic inhibition effect of amino acids and potassium iodide (KI) on carbon steel in 0.5&#xa0;M HCl was evaluated by electrochemical tests, surface analyses, and theoretical calculation. The results indicate that amino acids and KI exhibit a synergistic inhibition effect, which significantly improves the corrosion inhibition efficiencies of the inhibitors, especially at high temperature. Moreover, the synergistic inhibition mechanism and the relationship between the structure of amino acids and the synergistic inhibition effect are in-depth elucidated by surface analyses and theoretical calculations.</p> Graphical Abstract <p></p>

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In-depth research into the synergistic inhibition mechanism of amino acids and KI on the corrosion of carbon steel in acidic medium

  • 期刊论文

  • 发表日期：

    2025年1月17日

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  • Xia Liu,
  • Shihan Wu,
  • Ying Qin,
  • Yulu Zhang,
  • Wenhao Li,
  • Zhengbin Wang

摘要

In this work, three types of amino acids with different functional groups were selected, that is, l-methionine (Met), l-arginine (Arg), and l-aspartic acid (Asp). The synergistic inhibition effect of amino acids and potassium iodide (KI) on carbon steel in 0.5 M HCl was evaluated by electrochemical tests, surface analyses, and theoretical calculation. The results indicate that amino acids and KI exhibit a synergistic inhibition effect, which significantly improves the corrosion inhibition efficiencies of the inhibitors, especially at high temperature. Moreover, the synergistic inhibition mechanism and the relationship between the structure of amino acids and the synergistic inhibition effect are in-depth elucidated by surface analyses and theoretical calculations.

Graphical Abstract