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Articles by A.J. Alawode
Total Records ( 6 ) for A.J. Alawode
  J.T. Stephen , A.J. Alawode and O.I. Oluwole
  The effects of heat treatment on corrosion rates of pipe weldments and pipe-whip restraint devices in saltwater medium were investigated and presented. Mild steel pipes were preheated within temperature range of 30-200C before respective circumferential welding of single-, double- and triple-passes. Thereafter, pipe weldment zones of 10 mm width were cut out and immersed in saltwater. The corrosion rate of single-pass weldment of as-received pipe immersed in saltwater for 90 days was found to decrease by 8.47 and 20.0% due to pipe preheat at 100 and 200C, respectively. Also, the corrosion rates of double-pass and triple-pass weldments of as-received pipes were correspondingly higher than the 6.85 mpy value for single-pass weldment of identical as-received by 3.21 and 6.57%. This shows that corrosion rate decreases with increase in pipe preheat temperatures but increases with increase in welding pass. Though, weight loss increases with increase in immersion time, corrosion rate does not follow the same trend due to the concentration of stagnant ions blocking the creation of more ions and thus reducing Fe2+ activities in the solution. Corrosion rate of U-bar specimens was also found to decrease with increase in immersion time and with increase in tempering temperature. The findings of this research work shows that appropriate heat treatment could be used to minimize the corrosion rates of metallic structures in a corrosive medium.
  A.J. Alawode , M.O. Akomolede and A.O. Agbanigo
  The effects of tempering temperatures of range 30 to 600C and corrosive action of saltwater medium on the fatigue properties of AISI 410 stainless steel rods were experimentally investigated and presented. Fatigue limit was found to decrease with increase in tempering temperature; at 107 cycles to failure, the fatigue strength of non-corroded as-received specimen increased from 310 to 520 MPa after quenching, while the as-quenched value later decreased to 400 and 340 MPa due to tempering for 30 min at 400 and 600C, respectively. Also, fatigue life was observed to decrease with increase in tempering temperature. At fatigue stress of 550 MPa, the fatigue life of non-corroded as-received specimen was elongated from 103.8 to 105.7 cycles to failure after quenching, while tempering as-quenched specimen at 400 and 600C caused its fatigue life to be shortened to 104.8 and 104.0 cycles to failure, respectively. Corrosion in saltwater for 30 days decreased the fatigue strength of as-received specimen at 107 cycles to failure to 292 MPa, while the corroded as-quenched, 400 and 600C-tempered specimens exhibited relatively improved values of 466, 370 and 316 MPa, respectively. Above 105.5 cycles to failure, decline in fatigue limit due to corrosion was found to decrease with increase in tempering temperature. Also, at the same fatigue stress, corrosion has adverse effects on the fatigue life of the specimens; corrosion caused the fatigue life of as-received specimen to decrease from 103.8 to103.6 cycles to failure, while the corroded as-quenched, 400 and 600C-tempered specimens displayed relatively elongated fatigue life values of 105.4, 104.7and 103.9cycles to failure.
  A.J. Alawode and S.B. Adeyemo
  The corrosion rates and tensile properties of mild steel rods, quenched in water and tempered within temperature range of 200-600C at an interval of 100C, were experimentally investigated and presented. Sodium chloride solution containing approximately 3.5% weight of solute, prepared from 97.5% table salt, was used as the corrosive medium. Some as-quenched and tempered specimens were retained as non-corroded specimens while other identical specimens were totally immersed in seawater medium for 90 uninterrupted days. Corrosion in saltwater was found to have adverse effects on both the strength and ductility of the specimens; the ultimate tensile strength and percentage elongation at fracture of as-quenched specimen were found to decrease from 523.44-498.68 MPa and from 12.007.14%, respectively due to corrosion in saltwater. Also, increase in tempering temperature was observed to have reduction effects on strength but increasing effect on ductility; the ultimate tensile strength and percentage elongation at fracture of as-quenched specimen were observed to vary from 523.440-470.39 MPa and from 12.0015.28%, respectively due to tempering at 400C for 45 min. Weight loss of test specimens was measured to evaluate the corrosion rate. However, the susceptibility of the specimens to corrosion is reduced with increase in tempering temperature. Remarkable resistance to corrosion was observed within temperature range of 300600C; the corrosion rate of as-quenched specimen decreases from 31.43-17.85 mils year 1 due to tempering at 400C for 45 min. The percentages of resilience retained after tempering are found to be closer in values to the percentage corrosion rates of identical specimens. This shows corrosion rate to be a function of the level of resilience retained in the specimens.
  A.J. Alawode and S.B. Adeyemo
  The impacts of foundry sand sizes and mould preheat temperatures of range 30-200C on the mechanical properties of cast aluminium rods were experimentally investigated and presented. At the same mould preheat temperature, cast specimens from fine sand mould exhibited highest tensile, impact and torsional properties with better hardness values. Also, preheating as-prepared fine sand mould to isothermal temperatures of 100 and 200C for 1 h caused the percentage elongation of its cast specimen to increase from 9.8-11.8 and 13.5, respectively impact energy increased by 13.3 and 33.3%, respectively from initial value of 15 J, while its hardness, tensile strength and ultimate shear strength having respective initial values of 61.8 HRB, 144.6 MPa and 2.050 GPa correspondingly decreased by 11.5, 13.0 and 9.76% due to mould preheat to 200C. Hence, for optimal mechanical properties, fine sand is found appropriate and preheating sand mould to about 200C for some period in the furnace is considered adequate in effecting small changes in the mechanical properties of cast specimens, while avoiding crack formation in the sand mould due to excessive heat accumulation.
  A.J. Alawode , J.T. Stephen and G.J. Adeyemi
  Environmental pollution is a major adverse consequence of the rapid urban growth, increased economic activities and industrial development witnessed globally and particularly in Nigeria for the past few years. Various forms of pollution pose threat to the health and safety of mankind and its environment. This study, therefore, carries out an assessment of the health, safety and environmental issues in Nigerian manufacturing and processing industries with a view to re-awakening and re-sensitizing environmentally conscious industrial activities and municipal waste disposal attitudes towards a safe and healthy environment. Diverse forms of occupational hazards, air and water pollution and waste management and disposal challenges are discussed and the health, safety and environmental attitudes of Nigerian industries, municipalities and the public in general are reviewed. Workers in many Nigerian companies are exposed to a lot of occupational hazards and our air and water pollution control and waste management and disposal systems need to be improved to comply with international standards. Suggestions are therefore made towards an improved health and safety status of the environment by recommending industrial health, safety and environmental policies for Nigerian companies. Measures of minimizing occupational hazards and ways of actualizing efficient and effective industrial waste management and disposal systems are also recommended.
  A.J. Alawode and A.O. Ojo
  Nigerian Industries over the last few years have operated below expected manufacturing/production levels owing to operational processes and management decisions adopted, which has not proved effective. The consequence of this has resulted in moribund industrial activities and in most cases, led to the comatose nature of such industries. Such manufacturing process adopted, which results in wastage in material, low productivity and/or idle inventory are expected to be replaced by well efficient production process, which would work to bring its advantage and thus, enhance industrial activities in Nigeria. This study presents, a philosophy/system, the Just-In-Time (JIT) manufacturing philosophy, which is one of the Japanese management techniques, to be adopted and implemented by Nigerian companies. The study attempts to assess manufacturing in Japan and Nigeria and also reaches a compromise on how to implement the JIT manufacturing philosophy in Nigerian industries thus, enabling such industries enjoy the dividends of the philosophy.
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