Effectivness of Musa Paradisiaca Leaves (MPL) extract for carbon steel corrosion protection in sea water

Authors

  • Osuani F. Idema Africa Centre of Excellence in Future Energies and Electrochemical Systems ACE-FUELS, Federal University of Technology, Owerri, Imo State, Nigeria; Federal Polytechnic of Oil and Gas, Bonny, Rivers state, Nigeria Author https://orcid.org/0000-0001-8710-0052
  • Malik Abdulwahab Africa Centre of Excellence in Future Energies and Electrochemical Systems ACE-FUELS, Federal University of Technology, Owerri, Imo State, Nigeria; Department of Metallurgical and Materials Engineering, Air Force Institute of Technology, Kaduna, Nigeria Author https://orcid.org/0000-0001-8457-0032
  • Innocent O. Arukalam Africa Centre of Excellence in Future Energies and Electrochemical Systems ACE-FUELS, Federal University of Technology, Owerri, Imo State, Nigeria; Department of Polymer and Textile Engineering, Federal University of Technology, Owerri, Imo State, Nigeria Author https://orcid.org/0000-0003-2359-4852
  • Ifeyinwa C. Ekeke Africa Centre of Excellence in Future Energies and Electrochemical Systems ACE-FUELS, Federal University of Technology, Owerri, Imo State, Nigeria; Department of Chemical Engineering, Federal University of Technology, Owerri, Imo State, Nigeria Author https://orcid.org/0000-0002-8165-4449
  • Chigoziri N. Njoku Africa Centre of Excellence in Future Energies and Electrochemical Systems ACE-FUELS, Federal University of Technology, Owerri, Imo State, Nigeria; Department of Chemical Engineering, Federal University of Technology, Owerri, Imo State, Nigeria Author https://orcid.org/0000-0002-8999-3912
  • Anyiam N. Chioma Africa Centre of Excellence in Future Energies and Electrochemical Systems ACE-FUELS, Federal University of Technology, Owerri, Imo State, Nigeria; Department of Prosthetics and Orthotics, School of Health Technology, Federal University of Technology, Owerri, Imo State, Nigeria Author https://orcid.org/0000-0002-8274-3865
  • Ikenna B. Onyeachu Africa Centre of Excellence in Future Energies and Electrochemical Systems ACE-FUELS, Federal University of Technology, Owerri, Imo State, Nigeria; College of Science and Computer, Wigwe University Isiokpo, Rivers State, Nigeria Author https://orcid.org/0000-0003-1090-0611
  • Emeka E. Oguzie Africa Centre of Excellence in Future Energies and Electrochemical Systems ACE-FUELS, Federal University of Technology, Owerri, Imo State, Nigeria Author https://orcid.org/0000-0003-2708-9298

DOI:

https://doi.org/10.62638/ZasMat1580

Abstract

The effectiveness of Musa Paradisiaca Leaf (MPL) extract-based corrosion inhibitor for carbon steel in 3.5wt.% NaCl solution has been studied using Fourier Transform Infrared Spectroscopy(FT-IR), Gravimetric Method (GM), Potentiodynamic Polarization (PDP) and Electrochemical Impedance Spectroscopy (EIS), Contact angle measurement (Ө), Density Functional Theory(DFT) and Molecular Dynamics(MD) simulations. The FTIR analysis showed presence of polar functional groups. While the GM revealed inhibition efficiency of 91% and a reduced corrosion rate from 0.8817 to 0.0823 mm/y. Likewise, PDP via Tafel plots showed a cathodic slope capable of controlling both activation (oxidation) and diffusion (oxygen reduction) reactions, indicating a mixed-type inhibitor, also the concentration of MPL extract at 100g/L showed a corrosion rate of about 0.1mm/y with an efficiency of 90.1%. EIS via Nyquist plot showed a semicircle with widened diameter and increased peak heights indicating a higher charge transfer resistance (Rct). Contact angle measurements showed presence of thin films on the metal/inhibitor interface. Further, DFT analysis showed the presence of electron-rich centers, heteroatoms, polar functional groups which correlated the results by affirming the contributions of the isolated compounds of the MPL inhibitor molecule to the high inhibition efficiency. In addition, MD simulation showed presence of Langmuir films on the inhibitor/metal interface in planer orientation and large surface coverage. Radial distribution function (RDF) showed presence of short bond lengths of between 2.97Å-3.49Å, confirming the presence of chemical bonding. These highlights suggest that the corrosion inhibition performance of MPL is like that of a typical surfactant and attributed this to the presence of saponins in its molecule.

Keywords:

Carbon steel corrosion; Contact angle measurement; DFT& MD simulation; electrochemical measurement; gravimetric analysis, Musa Paradisiaca Leaves, Surfactant
Supporting Agencies
The authors are grateful for the research support from the Africa Centre of Excellence in Future Energies and Electrochemical Systems (ACE-FUELS), Federal University of Technology Owerri (FUTO), Nigeria for the provision of the software and other materials including their general research laboratory used for the study

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