Browsing by Author "Ogunleye, O. O."

Now showing 1 - 2 of 2
  • Item
    Modelling stochastic response of type 304 stainless steel (SS-304) crevice corrosion in chloride environments
    (Indian Chemical Engineer (Taylor & Francis), 2018-11-26) Adeniyi, A. G.; Ogunleye, O. O.; Durowoju, M. O.; Odeyemi, S. O.
    The stochastic corrosion response of creviced SS-304 in chloride environment was studied. The crevice assembly used for this study comprised coupon (SS-304), polytetrafluoroethylene (crevice former) and fasteners (titanium bolt, nut and washers) designed in three configurations with crevice scaling factor of 8, 16 and 24, respectively. An immersion test was carried out on each configuration having 40 crevice sites and immersed in various chloride solution concentrations of 1.5, 3.0 and 4.5 w/w % simulating environmental conditions A, B and C, respectively, for 60 days to study the stochastic nature of the initiation and propagation of cc in chloride environments according to ASTM G-78. Data obtained were used to develop a Monte Carlo’s model of the crevice corrosion pattern which confirmed the stochastic nature of the crevice corrosion. The probability of attack of SS-304 within 30 days was 0.150, 0.300 and 0.425 for A, B and C, respectively, while the extreme value of the propagated depth of attack was predicted from the stochastic models developed. The developed model is a useful tool for predicting the maximum depth of attack possible under uncertain crevice corrosion of SS-304 in chloride environment.
  • Item
    Process Optimisation and characterization of fragrance suited mechanically expressed Nigerian Lime seed oil
    (Nigerian Journal of Technology (NIJOTECH), 2018-04-01) Adeniyi, A. G.; Adewoye, L. T; ELETTA, O. A. A.; Ogunleye, O. O.; Olukotun, K
    This study determined the optimal process parameters for the extraction of Lime (Citrus aurantifolia) Seed Oil (LSO) for fragrance production. A Box Behnken Design (BBD) of Response Surface Methodology (RSM) was used to design the LSO extraction using hydraulic press. The effect of various combinations of temperature, heating time and pressing time on oil yield, specific gravity, acid value, saponification value, FFA, Iodine and peroxide values were investigated. The oil produced was analysed using Gas Chromatography – Mass Spectrophotometer (GC-MS). The R2 -values of models ranged between 0.998 and 0.999 and adjusted R2 between 0.994 and 0.998. A maximum of 29.21 % of LSO yield was obtained with specific gravity (0.861), acid value (2.86 mg KOH/g); saponification value (185.3 mg KOH/g), FFA (≤ 1.43 %), Iodine value (107.8 g I2/100 g) and peroxide value (15meq/kg) at the optimal process parameters of 83oC, 8 min and 7 min temperature heating and pressing time respectively. The physico-chemical analysis of the lime seed oil indicated that the oil could be used for fragrance.