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<p>This study investigates the corrosion inhibition potential of ethanol extract from <i>Chrysophyllum albidum</i> (<i>C. albidum</i>) leaves for aluminium in water-in-diesel emulsion (W/D). Aluminium is commonly used in internal combustion engine components due to its lightweight properties but is highly susceptible to corrosion in W/D. To address this challenge, the ethanol extract of <i>Chrysophyllum albidum</i> leaves was evaluated as a natural corrosion inhibitor. Stability studies were performed using the volume ratio of the emulsion layer to the total volume in the measuring cylinder method to assess the practical applicability of the emulsion. The corrosion inhibition performance was evaluated using weight loss measurements, Fourier transform infrared spectroscopy (FTIR), and atomic force microscopy (AFM). The stability tests showed that the W/D remained stable for up to 74&#xa0;h without phase separation. The weight loss data demonstrated a significant reduction in corrosion, with up to 96.88% inhibition efficiency (IE) at a maximum concentration of 2&#xa0;g/L. AFM imaging revealed a smoother surface on aluminium treated with the extract, with apparent surface roughness and roughness values of 313.2 and 250.9&#xa0;nm, compared to 332.2 and 267.5&#xa0;nm for uninhibited aluminium, indicating the formation of a protective layer that reduced corrosion. Also, the FTIR spectra showed clearly that some of the peaks detected in the spectra of the raw ethanol extract of <i>C. abidum</i> were also present in the spectra of the adsorbed film formed on the surface of aluminium, thus confirming the adsorption of the extract constituents on the aluminium surface in W/D. These findings indicate that the ethanol <i>C. abidum</i> leaf extract is an effective, environmentally friendly corrosion inhibitor for aluminium in W/D emulsions. Future study is needed to explore the scalability of the extraction process and the potential for commercial applications of <i>C. abidum</i> leaf extract as a corrosion inhibitor in fuel systems would provide valuable insights into its industrial feasibility.</p>

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Corrosion Inhibition of Aluminium in Water-in-Diesel Emulsion Using Ethanol Extract of Chrysophyllum albidum Leaves

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • Chijindu Ogechi Obunaonye,
  • Chiamaka Prisca Onuoha,
  • Emeka Emmanuel Oguzie,
  • Enos Ihediohamma Emereibeole,
  • Kanayo Lucy Oguzie

摘要

This study investigates the corrosion inhibition potential of ethanol extract from Chrysophyllum albidum (C. albidum) leaves for aluminium in water-in-diesel emulsion (W/D). Aluminium is commonly used in internal combustion engine components due to its lightweight properties but is highly susceptible to corrosion in W/D. To address this challenge, the ethanol extract of Chrysophyllum albidum leaves was evaluated as a natural corrosion inhibitor. Stability studies were performed using the volume ratio of the emulsion layer to the total volume in the measuring cylinder method to assess the practical applicability of the emulsion. The corrosion inhibition performance was evaluated using weight loss measurements, Fourier transform infrared spectroscopy (FTIR), and atomic force microscopy (AFM). The stability tests showed that the W/D remained stable for up to 74 h without phase separation. The weight loss data demonstrated a significant reduction in corrosion, with up to 96.88% inhibition efficiency (IE) at a maximum concentration of 2 g/L. AFM imaging revealed a smoother surface on aluminium treated with the extract, with apparent surface roughness and roughness values of 313.2 and 250.9 nm, compared to 332.2 and 267.5 nm for uninhibited aluminium, indicating the formation of a protective layer that reduced corrosion. Also, the FTIR spectra showed clearly that some of the peaks detected in the spectra of the raw ethanol extract of C. abidum were also present in the spectra of the adsorbed film formed on the surface of aluminium, thus confirming the adsorption of the extract constituents on the aluminium surface in W/D. These findings indicate that the ethanol C. abidum leaf extract is an effective, environmentally friendly corrosion inhibitor for aluminium in W/D emulsions. Future study is needed to explore the scalability of the extraction process and the potential for commercial applications of C. abidum leaf extract as a corrosion inhibitor in fuel systems would provide valuable insights into its industrial feasibility.