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<p>The mitigation effects of <i>Mangifera indica</i>, <i>Psidium guajava</i>, and <i>Carica papaya</i> on mild steel were studied in water-in-diesel emulsion (WiDE) with different concentrations (0.1–0.5&#xa0;g/L) of the plant extracts for 1344&#xa0;h. The stability tests indicated that WiDE with 10% water content and 5% surfactant dosage exhibited the highest stability, showing minimal phase separation after 33&#xa0;h. The corrosion inhibition results demonstrated that <i>Mangifera indica</i> leaf extract exhibited the highest inhibition efficiency (IE) (91.28% at 0.5&#xa0;g/L), followed by <i>Psidium guajava</i> (87.78%) and <i>Carica papaya</i> (85.71%). Additionally, the extracts reduced the average surface roughness by 72.48%, 49.61%, and 48.17%, respectively. FT-IR confirmed the interaction of the extract’s bioactive components with the mild steel surface, demonstrating the creation of a protective barrier. These findings highlight the potential of eco-friendly, plant-based inhibitors to mitigate corrosion in WiDE systems, enhancing the durability of engine components and supporting the broader adoption of WiDE as a low-emission fuel technology.</p>

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Comparative evaluation of the anti-corrosion efficacy of ethanol extracts of Mangifera indica, Psidium guajava, and Carica papaya on mild steel in water-in-diesel emulsion

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • Chukwuemeka Fortunatus Nnadozie,
  • Chiamaka Prisca Onuoha,
  • Eze Christopher Akanazu

摘要

The mitigation effects of Mangifera indica, Psidium guajava, and Carica papaya on mild steel were studied in water-in-diesel emulsion (WiDE) with different concentrations (0.1–0.5 g/L) of the plant extracts for 1344 h. The stability tests indicated that WiDE with 10% water content and 5% surfactant dosage exhibited the highest stability, showing minimal phase separation after 33 h. The corrosion inhibition results demonstrated that Mangifera indica leaf extract exhibited the highest inhibition efficiency (IE) (91.28% at 0.5 g/L), followed by Psidium guajava (87.78%) and Carica papaya (85.71%). Additionally, the extracts reduced the average surface roughness by 72.48%, 49.61%, and 48.17%, respectively. FT-IR confirmed the interaction of the extract’s bioactive components with the mild steel surface, demonstrating the creation of a protective barrier. These findings highlight the potential of eco-friendly, plant-based inhibitors to mitigate corrosion in WiDE systems, enhancing the durability of engine components and supporting the broader adoption of WiDE as a low-emission fuel technology.