Engineering

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Browsing Engineering by Author "FAYOMI Ojo S.I."

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    Corrosion and Surface Modification of Hybridized Seashell Composite on AA6063 Alloy for Advance Application
    (Asian Journal of Chemistry, 2025-08-30) FAYOMI Ojo S.I.; AJIBOLA Otitolaye A.; MIN Ho Soon; OLUWASEGUN Kunle M.
    Abstract This study focuses on utilizing abundantly available seashell ash by dispersing it in AA6063 alloy to form composites. A new aluminium metal matrix composite was developed by reinforcing AA 6063 alloy with particles of seashell ash as reinforcement materials in varying percentages (0, 10, 20, 30, 40 wt.%). The samples were prepared by using the stir casting method. The microstructural characterizations were carried out using optical microscopy and the scanning electron microscope (SEM), revealing particle shape and size descriptions for the composite microstructural features. The results indicate that the composite materials exhibit relatively larger and more uniformly distributed grain sizes compared to the base material. The outcomes demonstrate a significant improvement in the tensile strength and hardness of the composites, accompanied by a decrease in corrosion rates. The best samples display a 90.95% increase in tensile strength, a 38.01% increase in hardness and a 71.5% decrease in corrosion rate in an HCl environment, along with a 46.7% decrease in a NaCl environment. Furthermore, there is a 207.7% increase in impact strength in the sample reinforced with 20 wt.% of seashell ash. Overall, the AA-SS composite with 20% wt. seashell ash exhibits the most favourable properties, featuring a 90.95% increase in tensile strength, a 38.01% increase in hardness and a lower corrosion rate when compared to the control sample.
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    ItemOpen Access
    Mechanical and Structural Investigation of Zn-MnO2 Coating on Mildsteel
    (Scientific Net, 2024-11-01) DEREK Alima O.; FAYOMI Ojo S.I.; ATIBA Joshua O.
    Abstract: Failure in manufacturing industries is a worldwide concern and it occurs most often at elevated temperatures and pressure. Acid, gases, and steam are known to be corrosion and stress-induced propagators resulting in incessant catastrophes. More so, material failure can be due to the substrate material used in the coating while substrate failure can further be classified into the substrate morphology, surface chemistry as well as contamination. Thus, the study developed a multifaceted layer of zinc barrier coating via the electrodeposition technique and observe its response by characterizing the developed coating. The mild steel plate, Zn and MnO2 were procured and characterized according to the ASTM standard. Mild steel of dimension 60×30×2 mm was sectioned and polished using varying sizes of abrasives. The result of the coating thickness showed that Zn-6MnO2 had a weight gain of 0.30g. Zn-12MnO2 was observed to have excellent corrosion performance compared to the as-received and the other formulations of Zn-MnO2 with a corrosion resistance of 2.117 mm/year. The SEM image of Zn-MnO2 showed aggregates of clustered grains, thus, no possible fracture lines were observed on the coating surface. Zn-12MnO2 exhibited a hardness value of 252.72 BHN. Additionally, the EDS of the coatings revealed significant elements that helped in the corrosion performance and hardness properties of the coatings.