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Background <p>X52 steel exhibits a high susceptibility to corrosion within hydrochloric acid environments. In order to formulate an effective and eco-friendly corrosion inhibition strategy, a phytochemical-rich <i>Sophora japonica</i> L. leaf extract (SJLE) was acquired by ultrasound-assisted extraction. Electrochemical tests, surface analysis, and theoretical calculations were employed to evaluate its performance.</p> Results <p>The results showed that 500 ppm SJLE alone achieved 72.83% corrosion inhibition efficiency, while a combination with 10 mM (1660 ppm) KI significantly enhanced this to 92.48%, with a synergism parameter confirming strong positive synergy. Surface characterizations confirmed the formation of a dense, uniform protective film, and quantum chemical calculations revealed that the main active components, quercetin and rutin, adsorbed onto the Fe(110) surface primarily through electron donation from O- and C-centered functional groups.</p> Conclusion <p>This work demonstrates the promising potential of the SJLE-KI system as an eco-friendly and high-performance corrosion inhibitor for carbon steel in acidic media.</p> Graphical Abstract <p></p>

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Extraction of Sophora japonica L. leaf extract and its application for corrosion inhibition of X52 steel in hydrochloric acid

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月28日

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  • Yuxuan Guo,
  • Hualiang Huang,
  • Gangliang Huang

摘要

Background

X52 steel exhibits a high susceptibility to corrosion within hydrochloric acid environments. In order to formulate an effective and eco-friendly corrosion inhibition strategy, a phytochemical-rich Sophora japonica L. leaf extract (SJLE) was acquired by ultrasound-assisted extraction. Electrochemical tests, surface analysis, and theoretical calculations were employed to evaluate its performance.

Results

The results showed that 500 ppm SJLE alone achieved 72.83% corrosion inhibition efficiency, while a combination with 10 mM (1660 ppm) KI significantly enhanced this to 92.48%, with a synergism parameter confirming strong positive synergy. Surface characterizations confirmed the formation of a dense, uniform protective film, and quantum chemical calculations revealed that the main active components, quercetin and rutin, adsorbed onto the Fe(110) surface primarily through electron donation from O- and C-centered functional groups.

Conclusion

This work demonstrates the promising potential of the SJLE-KI system as an eco-friendly and high-performance corrosion inhibitor for carbon steel in acidic media.

Graphical Abstract