Exploration of the effect of Zn-MgO-UPP coating on hardness, corrosion resistance and microstructure properties of mild steel

Original scientific paper


  • Itopa Godwin Akande Department of Mechanical Engineering, Bells University of Technology, P.M.B. 1015, Ota, Ogun State, Nigeria https://orcid.org/0000-0002-6807-8539
  • Ojo Sunday Isaac Fayomi Department of Mechanical Engineering, Bells University of Technology, P.M.B. 1015, Ota, Ogun State, Nigeria
  • Bassey Jonah Akpan Department of Mechanical Engineering, Bells University of Technology, P.M.B. 1015, Ota, Ogun State, Nigeria https://orcid.org/0000-0003-3311-2095
  • Olajide Abraham Aogo Department of Research and Development Unit, Standard Connections Limited, Nigeria and Department of Mechanical Engineering, University of Ibadan, Ibadan, Oyo State, Nigeria https://orcid.org/0000-0003-0582-8715
  • Patrick Nwanne Onwordi Department of Mechanical Engineering, Bells University of Technology, P.M.B. 1015, Ota, Ogun State, Nigeria https://orcid.org/0000-0003-1849-6182




SEM, XRD, passivation, composite, homogeneity
Graphical Abstract


This paper investigated the effect of unripe plantain peel (UPP) nanoparticles reinforced Zn-MgO composite coating on the hardness, anti-corrosion and microstructure properties of mild steel. The anti-corrosion characteristics of the coatings were examined using the potentiodynamic polarization method, employing 3.65 % NaCl solution as the test medium. The hardness of the coatings was studied employing the Brinell hardness technique, while the microstructure characteristics were examined using XRD and SEM/EDS. The results of the study revealed that the as-received mild steel sample exhibited the corrosion rate and hardness value of 8.6272 mm year-1 and 136.8 kgf mm-2, respectively, while the Zn-MgO co­ated mild steel sample exhibited a corrosion rate and hardness value of 3.6362 mm year-1 and 42.5 kgf mm-2, respectively. The optimal performing Zn-MgO-UPP coated mild steel sample (sample coated with 20 g L-1 of MgO and 6 g L-1 of UPP) exhibited a corrosion rate and hardness value of 0.8317 mm year-1 and 245.8 kgf mm-2, respectively. The corrosion rate and hardness value of the Zn-20MgO-6UPP coated mild steel sample indicated that the UPP nanoparticles further improved the passivating and strengthening ability of Zn-MgO coating. Moreover, the XRD profile of the coatings possessed high intensities, which indi­cat­ed that the coatings exhibit microstructural and chemical homogeneity, high stability and good texture. It was observed on the SEM micrographs that the Zn-MgO-UPP coating exhi­bited a more refined microstructure compared to the Zn-MgO coating, indicating the grain refining tendency of the UPP nanoparticles. The EDS further indicated the presence of essential and dispersion strengthening elements in the coatings.


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How to Cite

Akande, I. G., Fayomi, O. S. I. ., Akpan, B. J., Aogo, O. A., & Onwordi, P. N. (2022). Exploration of the effect of Zn-MgO-UPP coating on hardness, corrosion resistance and microstructure properties of mild steel: Original scientific paper. Journal of Electrochemical Science and Engineering, 12(5), 829–840. https://doi.org/10.5599/jese.1311