Browsing by Author "Adewuyi, O. A."

Now showing 1 - 5 of 5
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    Comparative Analyses of the Inhibitive Influence of Cascabela thevetia and Jatropha curcas Leaves Extracts on Mild Steel
    (Technoscience Publications, 2020) 2. Adekunle, A. S.; Adeleke, A. A.; Ikubanni, P. P.; Adewuyi, O. A.
    The inhibitive properties of the extracts of Cascabela thevetia and Jatropha curcas were comparatively studied on corrosion of mild steel in H2SO4 acid. The extracts of both plants contained active phytochemical constituents such as tannins, saponins, alkaloids, flavonoids, terpenes and phenols which made them useful as good corrosion inhibitors. The extract concentrations were varied from 0.3 to 1.5 g/L during both the gravimetric and gasometric analyses for an exposure time of 7-28 days. The weight loss of the coupon, corrosion rate, surface coverage and inhibitive efficiency was evaluated for both the extracts. The results of the gravimetric and gasometric analyses indicated that inhibitive efficiency increased with an increase in the concentration of inhibitors and the highest was 55.77% for Jatrophas curcas at the concentration of 1.5 g/L. The weight loss was a little lower for Cascabela thevetia (4.36 g) compared to Jatrophas curcas (4.66 g) at the highest exposure time used (28 days). Cascabela thevetia has a better surface coverage (0.68) than Jatropha curcas (0.61), hence, Cascabela thevetia inhibits better for a 7-day exposure time. However, when the mild steel was further exposed for more than 7 days, Jatropha curcas exhibited a better inhibitive property. The highest and least hydrogen gas evolution was obtained at 0.3 g/L concentration (7 minutes) and 1.5 g/L concentration (1 minute) for both Cascabela thevetia and Jatropha curcas leaves extracts, respectively. Based on the results, the utilization of extracts of Cascabela thevetia and Jatropha curcas leaves as replacements for toxic organic inhibitors in industries are recommended.
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    Corrosion Properties of Aluminum Alloy Reinforced with Wood Particles
    (Multidisciplinary Digital Institute, 2022) Omoniyi, P. O.; Abolusoro, O.; Olorunpomi, O.; Ajiboye, T. K.; Adewuyi, O. A.; Aransiola, O.; Akinlabi, E.
    Abstract: The need for improved metallic materials in terms of physicomechanical, microstructure, and corrosion properties has necessitated the need to form metal matrix composites. This article adopted the stir casting procedure and used wood particles (WP) to reinforce aluminum alloy at different volume fractions. The corrosion properties of the aluminum matrix in 3.5% wt NaCl were characterized using scanning electron microscopy (SEM), the potentiodynamic polarization curve, and open circuit potential. The corrosion results of the reinforced aluminum alloys was compared with the unreinforced alloy. The unreinforced sample showed improved resistance to corrosion compared to the reinforced aluminum alloy. All samples exhibited visible Pits on SEM observation.
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    Effectiveness of Biodegredable Oils as Quenching Media for Commercial Aluminum
    (2020) Adekunle, A. S.; Adeleke, A. A.; Ikubanni, P. P.; Adebiyi, K. A.; Adewuyi, O. A.
    The effectiveness of biodegradable oils such as palm oil, shea-butter oil and jatropha oil, compared to the conventional mineral oil, in the quenching of commercial aluminium was investigated. Pure commercial aluminium was solutionized in an electric furnace at (200, 250, 300 and 350) °C. The mechanical properties of the samples of commercial aluminium were determined while the cooling rate and quench severity of the oils were studied. The results showed that the quench severity of the oils is directly proportional to the heat-transfer coefficient; jatropha oil, palm oil, shea butter and conventional mineral oil had heat-transfer coefficients of (648.80, 621.38, 447.80 and 520.72) W/m2K at the nucleation region, while their quench severities were (0.861, 0.752, 0.630, and 0.758) m–1, respectively. The hardness values of the pure commercial aluminium after quenching in jatropha oil, shea-butter oil, palm oil and mineral oil were (116.7, 121.9, 116.0 and 91.1) HVN, with tensile strengths of (96.59, 127.60, 100.86 and 84.35) MPa, respectively. Shea-butter oil and palm oil are better quenching media for pure commercial aluminium when high ductility is required, while jatropha oil can be used when low ductility, or brittleness, is of importance.
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    Energy and Exergy Analysis of a Thermally Dried Galvanized Roofing Sheets Production Process
    (University POLITEHNICA Timisoara, 2020) 1. Ohijeagbon, I. O.; Ibrahim, H. K.; Adewuyi, O. A.; Fayomi, A. A.
    Abstract: Energy and exergy analysis of a thermally dried galvanized roofing sheets production plant was investigated. Data related to the operating units of the plant were analysed and used for the parametric analysis of the energy and exergy performance of the plant. The highest energy efficiency experienced in the precuring operation was in the pre-mixing and mixing operating units with a value of 90.91% each. The energy efficiency in the boiler and autoclave units of the curing operations were found to be 78.02 and 82.04% respectively. The boiler had a higher exergy efficiency of 58.31% compared to the autoclave with an exergy efficiency of 19.06%. The parametric analysis of the autoclave shows that the energy efficiency and exergy destruction both increased from 75.33 to 84.71% and from 54.72 to 95.70% as the exit temperature reduced from 100 to 30oC, while the exergy efficiency reduced from 45.28 to 4.30% within the same exit temperature range. The overall energy and exergy efficiencies of the plant were obtained as 80.03% and 42.13%. The method provides an approach to mitigate operational losses and enhance efficient utilization of energy of thermally dried galvanized roofing sheets production plants and similar industrial processes.
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    Energy and Exergy Analysis of a Thermally Dried Galvanized Roofing Sheets Production Process.
    (Published by University Politehnica Timisoara, Faculty of Engineering Hunedoara , 5, Revolutiei, 331128, Hunedoara, Romania., 2020-02-01) Ohijeagbon, I. O.,; Ibrahim, H. K.,; Adewuyi, O. A.; Fayomi, A. A.
    Energy and exergy analysis of a thermally dried galvanized roofing sheets production plant was investigated. Data related to the operating units of the plant were analysed and used for the parametric analysis of the energy and exergy performance of the plant. The highest energy efficiency experienced in the pre- curing operation was in the pre-mixing and mixing operating units with a value of 90.91% each. The energy efficiency in the boiler and autoclave units of the curing operations were found to be 78.02 and 82.04% respectively. The boiler had a higher exergy efficiency of 58.31% compared to the autoclave with an exergy efficiency of 19.06%. The parametric analysis of the autoclave shows that the energy efficiency and exergy destruction both increased from 75.33 to 84.71% and from 54.72 to 95.70% as the exit temperature reduced from 100 to 30oC, while the exergy efficiency reduced from 45.28 to 4.30% within the same exit temperature range. The overall energy and exergy efficiencies of the plant were obtained as 80.03% and 42.13%. The method provides an approach to mitigate operational losses and enhance efficient utilization of energy of thermally dried galvanized roofing sheets production plants and similar industrial processes.