Corrosion Inhibition Performance of 5-(3-hydroxyphenyl)-3-carboxyisoxazole for Mild Steel in Acidic Media: Experimental and Theoretical Insights

Authors

  • Ayad Abbood Abdulhasan Department of Metallurgy Engineering, Al-Mustafa University, Baghdad, Iraq Author https://orcid.org/0009-0008-3272-5109
  • Ali J. Naisan Ministry of Oil State Company for gas filling and services, Baghdad, Iraq Author
  • Kareem Mohsen Raheef Ashur university college, Baghdad, Iraq Author
  • Wael H. Alsadi Department of Chemistry, Faculity of Science, Taibah University, Al-Madinah Al-Munawarah, Medina, Saudi Arabia Author
  • F. F. Sayyid Production Engineering and Metallurgy, University of Technology, Baghdad, Iraq Author https://orcid.org/0000-0002-6817-335X
  • A. M. Mustafa Production Engineering and Metallurgy, University of Technology, Baghdad, Iraq Author https://orcid.org/0000-0002-5226-0926
  • A. Al-Amiery Al-Ayen Scientific Research Center, Al-Ayen Iraqi University, AUIQ, An Nasiriyah, Thi Qar, Iraq Author https://orcid.org/0000-0003-1033-4904
  • A. H. Kadhum Faculty of Medicine, University of Al-Ameed, Karbala, Iraq Author https://orcid.org/0000-0003-4074-9123

DOI:

https://doi.org/10.62638/ZasMat1518

Abstract

The present study investigates the corrosion inhibition efficiency of 5-(3-hydroxyphenyl)-3-carboxyisoxazole (HPCI) for mild steel in 1.0 M hydrochloric acid solution using weight loss and electrochemical techniques. The weight loss method was employed to assess the effect of varying inhibitor concentrations (0.0–0.5 mM) at 303 K over different immersion times (1–48 hours). The influence of temperature (303–333 K) on the inhibition performance was also evaluated at these concentrations for a fixed 5-hour immersion period. The results indicate that inhibition efficiency increases with inhibitor concentration, achieving a maximum of 88.2% at 0.5 mM. Interestingly, a slight increase in efficiency with temperature was observed, suggesting physical adsorption as a predominant mechanism. Potentiodynamic polarization studies at 303 K for 5 hours immersion corroborated the weight loss findings and confirmed a mixed-type inhibition mechanism. Adsorption behavior of the inhibitor was found to obey the Langmuir adsorption isotherm model, supporting a monolayer adsorption on the metal surface. Density Functional Theory (DFT) calculations provided electronic descriptors such as the energy gap (ΔEgap) and the highest occupied molecular orbital energy (EHOMO), which confirmed the high electron-donating ability and strong adsorption potential of HPCI. The synergistic use of experimental and theoretical methods demonstrates the potential of 5-(3-hydroxyphenyl)-3-carboxyisoxazole as an efficient and environmentally friendly corrosion inhibitor for mild steel in acidic environments.

Keywords:

weight Loss method, potentiodynamic polarization, carboxyisoxazole, mild steel, corrosion inhibitor
Supporting Agencies
AUIQ-RFP2024-CI

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