Browsing by Author "Abdul, J. M."
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Item CORROSION BEHAVIOUR OF Ti-V-Cr-Rh ALLOY ELECTRODE IN 6M KOH(Faculty of Engineering, Hunedoara University of Politechnica, Timisoara, Romania, 2019) Abdul, J. M.; Chown, L. H.; Shuaib-Babata, Y. L.Corrosion behaviour of Ti25-0.5xV40Cr35-0.5xRhx (x= 0, 0.5, 1 at %) alloy electrode in 6M KOH was investigated. The V-rich alloy was produced under argon atmosphere in an open hearth crucible furnace. The microstructure of the arc-melted alloy was examined by scanning electron microscopy, and the phases were identified by X-ray diffraction. The as-cast alloys contained a primary (V) body centered cubic phase and an intergranular αTi phase. Rhodium (Rh) decreased the Ecorr from -767 mV to -793 mV for 0.05 Rh and -825 mV for 0.10 Rh. The corrosion current also decreased from 1 μA/cm2 in Rh-free alloy to 0.77 μA/cm2 with addition of 0.05 at % Rh and 0.37 μA/cm2 with addition of 0.10 at.% Rh. Addition of 0.05 at. % Rh decreased the corrosion rate from 0.0110 to 0.0009 mm/y and to 0.001 mm/y with addition of 0.10 at.% Rh. Hardness of the alloy electrode decreased with addition of rhodium.Item CORROSION INHIBITION OF AISI 1007 STEEL IN HYDROCHLORIC ACID USING CUCUMIS SATIVUS (CUCUMBER) EXTRACTS AS GREEN INHIBITOR(Faculty of Engineering Hunedoara, University of Politehnica, Timisoara, 2018-10) Shuaib-Babata, Y. L.; Busari, Y. O.; Yahya, R. A.; Abdul, J. M.The inhibiting effect of cucumber peel and seed extracts on corrosion of AISI 1007 steel in 2M solution of Hydrogen Chloride (HCl) at ambient temperature was studied using gravimetric and electrochemical measurements (TAFEL polarization). It was observed that corrosion rates reduced with increase in the extracts’ concentration, and inhibition efficiency (IE%) increased with the concentration. The study revealed that the cucumber extracts possessed good inhibiting efficiency. Though, the cucumber peel extract’s efficiency was greater than that of the seed (oil) extract during gravimetric measurement. The highest inhibition efficiency (IE) of 86.63% was achieved using the cucumber peel extract as inhibitor with 1.0 g/l concentration, while cucumber seed (oil) extract recorded 39.23%. The electrochemical measurements (TAFEL polarization) results revealed that the corrosion current density decreased with the increased in the concentration of the cucumber peel extract. The decreased in corrosion was due to increased blocking of the metal surface by adsorption of the leaf extract. Therefore, the extracts could be used as a green inhibitor to the corrosion of AISI 1007 steel in the hydrochloric acid medium as a replacement for toxic inhibitors. Keywords: Tafel Polarization, Gravimetric, Current Density, Metal Surface Adsorption, Inhibiting EfficiencyItem Product Quality Assessment and Capacity Utilisation Model of Selected Waterworks in South-Western Nigeria.(Department of Civil Engineering, University of Ilorin, Ilorin, 2017) Abdul, J. M.; Shuaib-Babata, Y. L.; Adekoya, L. O.; Mutiu, K. A.Availability of personnel in right mix, number and quality water is also an essential factor of production to achieve optimum production capacity. This work therefore seeks to assess the water quality characteristics and benchmarking it with the World Health Organisation’s (WHO) standard. It also attempts to generate a mathematical model for optimising capacity in relation to mix and number of technical personnel. Data on water quality characteristics was gathered and subjected to statistical analysis. Failure records on each production equipment were obtained from the maintenance unit of the respective plants to calculate failure rate, F and reliability, . Regression analysis was performed on the data to generate the correlation and coefficient tables hence the model. The result revealed that none of the waterworks perform all the 14 mandatory tests (due to paucity of test equipment). Capacity utilisation, CU of the water production plant is weakly dependent on number of engineers, e; number of technologists, T, number of technicians, t; number of craftsmen, c while it is strongly a factor of the plant’s reliability Rp. The equation CU = 35.664 - 0.969e + 1.027T + 0.026t - 0.216c + 53.441Rp was found to be a valid model for optimising capacity utilisation of the selected plantItem QUALITY EVALUATION OF COMMERCIALLY AVAILABLE STEELS IN SOME SELECTED NIGERIAN MARKETS(University Politehnica Timsoara, Faculty of Engineering Hunedoara, 2019-05) Shuaib-Babata, Y. L.; Adewuyi, R. A.; Ajao, K. S.; Ambali, I. O.; Aremu, N. I.; Ibrahim, H. K.; Abdul, J. M.The incessant building collapse and structural failures in Nigeria has renewed interests in the evaluation of the basic properties of reinforcing steel bars in Nigeria markets, since local markets serve as major source of supply for the steels used in construction and structural development. Thus, this study evaluated the quality of commercially available reinforcing steel bars in some selected markets with a view to determine their suitability for structural applications. Various steel bars samples were obtained from markets in four Nigeria cities. The basic physico-mechanical properties of the samples were examined and the obtained results were compared with the specified parameters in Nigerian Industrial Standard (NIS), ASTM and British Standards. Visual inspections revealed that most of the parameters that must to be indicated in identification marks on reinforcing steel bars were absent. Results also showed that the samples contained the basic chemical constituents of steel and possessed significant strengths and hardness values, but with noticeable inconsistencies in their contents. Thus, the level of compliance with the specified properties in the standards needs improvement. To avoid incessant structural failures in the country, regular and effective monitoring of the quality of steel bars in the markets for structural applications becomes imperative.Item Quality Evaluation of Commercially Available Steels in Some Selected Nigerian Markets.(Published by University Politehnica Timisoara, Faculty of Engineering Hunedoara , 5, Revolutiei, 331128, Hunedoara, Romania., 2019-02-14) Shuaib-Babata, Y. L.,; Adewuyi, R .A.,; Ajao, K. S.,; Ambali, I. O.,; Aremu, N. I.,; Ibrahim, H. K.; Abdul, J. M.The incessant building collapse and structural failures in Nigeria has renewed interests in the evaluation of the basic properties of reinforcing steel bars in Nigeria markets, since local markets serve as major source of supply for the steels used in construction and structural development. Thus, this study evaluated the quality of commercially available reinforcing steel bars in some selected markets with a view to determine their suitability for structural applications. Various steel bars samples were obtained from markets in four Nigeria cities. The basic physico-mechanical properties of the samples were examined and the obtained results were compared with the specified parameters in Nigerian Industrial Standard (NIS), ASTM and British Standards. Visual inspections revealed that most of the parameters that must to be indicated in identification marks on reinforcing steel bars were absent. Results also showed that the samples contained the basic chemical constituents of steel and possessed significant strengths and hardness values, but with noticeable inconsistencies in their contents. Thus, the level of compliance with the specified properties in the standards needs improvement. To avoid incessant structural failures in the country, regular and effective monitoring of the quality of steel bars in the markets for structural applications becomes imperative.Item SUITABILITY OF ADO-EKITI (NIGERIA) NATURAL MOULDING SANDS FOR USE AS FOUNDRY SANDS IN PRODUCTION OF ALUMINUM ALLOY CAST(Department of Production Engineering, Faculty of Technical Sciences, University of Novi Sad, Serbia, Trg Dositeja Obradovica 6., 2017-12) Shuaib-Babata, Y. L.; Abegunde, A. J.; Abdul, J. M.Adequate application of sand casting processes in Aluminum casting can improve the economic activities of Nigeria through industrialization. Samples of natural moulding sand were collected from three different moulding sand deposits within Ado-Ekiti metropolis. The samples’ properties were evaluated using American Foundry Society standards. The samples were used to produce aluminum alloy cast specimens and their mechanical properties were evaluated. The results revealed that the properties compared favourably with standard values as indication that the moulding sands are suitable materials for aluminum casting. Thus, effective application of the sample sands will enhance industrialization, job creation and the nation self-reliance.