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<p>This study demonstrates the direct use of crude aqueous cagaita (<i>Eugenia dysenterica</i>) extract as a green corrosion inhibitor for AISI 1020 carbon steel in 10 wt% HCl. Unlike many plant-based inhibitors that require organic solvents, purification, or chemical modification, the proposed approach uses the raw extract directly, highlighting a simple, low-cost, and sustainable route for corrosion protection.</p><p>Electrochemical measurements showed that the extract strongly reduced the corrosion rate, reaching an inhibition efficiency of approximately 92% at 0.3&#xa0;g L⁻¹. The small shift in corrosion potential and the simultaneous decrease in anodic and cathodic currents indicate mixed-type inhibition, mainly controlled by adsorption on the steel surface. This behavior is attributed to phenolic compounds naturally present in the extract, especially epicatechin and quercetin, which can interact with the metal surface through hydroxyl groups and aromatic π-electron systems. Surface analyses confirmed reduced steel degradation and lower formation of corrosion products in the inhibited medium.</p><p>These results show that crude cagaita extract can be applied directly as an effective, renewable, and environmentally friendly inhibitor for carbon steel protection in acidic industrial environments.</p>

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Green corrosion inhibition of carbon steel in 10 wt% HCl solution using cagaita (Eugenia dysenterica) extract

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月23日

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  • Eric M. Garcia,
  • Hosane A. Taroco,
  • Julio O.F Melo

摘要

This study demonstrates the direct use of crude aqueous cagaita (Eugenia dysenterica) extract as a green corrosion inhibitor for AISI 1020 carbon steel in 10 wt% HCl. Unlike many plant-based inhibitors that require organic solvents, purification, or chemical modification, the proposed approach uses the raw extract directly, highlighting a simple, low-cost, and sustainable route for corrosion protection.

Electrochemical measurements showed that the extract strongly reduced the corrosion rate, reaching an inhibition efficiency of approximately 92% at 0.3 g L⁻¹. The small shift in corrosion potential and the simultaneous decrease in anodic and cathodic currents indicate mixed-type inhibition, mainly controlled by adsorption on the steel surface. This behavior is attributed to phenolic compounds naturally present in the extract, especially epicatechin and quercetin, which can interact with the metal surface through hydroxyl groups and aromatic π-electron systems. Surface analyses confirmed reduced steel degradation and lower formation of corrosion products in the inhibited medium.

These results show that crude cagaita extract can be applied directly as an effective, renewable, and environmentally friendly inhibitor for carbon steel protection in acidic industrial environments.