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Corrosion poses significant challenges to metals used in construction and machinery. This study evaluated the Inhibitive Effect of Papaya (Carica papaya) leaf extract, obtained through Ultrasound-Microwave Assisted Extraction (UMAE), as an eco-friendly corrosion inhibitor for mild steel. Papaya leaves are rich in phytochemicals such as alkaloids, flavonoids, tannins, and saponins, which form protective layers on metal sur-faces and reduce degradation. UMAE, combining ultrasonic and microwave-assisted extraction, proved more efficient than conventional Soxhlet extraction, yielding 63.43% compared to 6.78%, while preserving bioactive compounds. Papaya leaf extract (PLE) coated mild steel strips were immersed in hydrochloric acid solutions (0.5M, 1M, 1.5M) and monitored over various exposure times. Weight loss, corrosion rates, and inhibition efficiency were measured, with the lowest weight loss of 2.1798 g under 4 coatings of PLE after 336 h and a peak efficiency of 97.63%. Characterization techniques such as SEM–EDX, FTIR, and UV–Vis confirmed the formation of corrosion-resistant barriers and identified key functional groups responsible for PLE’s protective properties. These findings position PLE as a promising, sustainable solution for corrosion prevention in industrial applications.

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Mechanistic Validation of a Superior Papaya Leaf Inhibitor Derived from Ultrasound-Microwave Assisted Extraction (UMAE) for High-Performance Corrosion Shielding of Mild Steel

  • 会议论文

  • 发表日期：

    2026年

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  • Jozel Valenzuela,
  • Arbee Chrystel Alera,
  • Alexandria Bernardo,
  • James Gabriel Galano,
  • Rosemary Cole,
  • Rugi Vicente Rubi,
  • Rich Jhon Paul Latiza

摘要

Corrosion poses significant challenges to metals used in construction and machinery. This study evaluated the Inhibitive Effect of Papaya (Carica papaya) leaf extract, obtained through Ultrasound-Microwave Assisted Extraction (UMAE), as an eco-friendly corrosion inhibitor for mild steel. Papaya leaves are rich in phytochemicals such as alkaloids, flavonoids, tannins, and saponins, which form protective layers on metal sur-faces and reduce degradation. UMAE, combining ultrasonic and microwave-assisted extraction, proved more efficient than conventional Soxhlet extraction, yielding 63.43% compared to 6.78%, while preserving bioactive compounds. Papaya leaf extract (PLE) coated mild steel strips were immersed in hydrochloric acid solutions (0.5M, 1M, 1.5M) and monitored over various exposure times. Weight loss, corrosion rates, and inhibition efficiency were measured, with the lowest weight loss of 2.1798 g under 4 coatings of PLE after 336 h and a peak efficiency of 97.63%. Characterization techniques such as SEM–EDX, FTIR, and UV–Vis confirmed the formation of corrosion-resistant barriers and identified key functional groups responsible for PLE’s protective properties. These findings position PLE as a promising, sustainable solution for corrosion prevention in industrial applications.