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Comparative effects of corrosion on electroless-nickel plated A6061 alloys in DOT3 brake fluid

Effect of heat treatment on wear behaviour of rolled carbon steel in DOT4 brake fluid

  • Authors: Ajibola, Olawale O. , Akinribide, Ojo J. , Akinwamide, Samuel O. , Olubambi, Peter A.
  • Date: 2019
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/403861 , uj:33859 , Citation: Olawale O Ajibola et al 2019 IOP Conf. Ser.: Mater. Sci. Eng. 628 012014
  • Description: Abstract: The wear of heat-treated rolled carbon steels (HTRCSs) were performed under dry and wet sliding in DOT4 brake fluid is successfully investigated and reported in the study. The HTRCSs samples were obtained by heating to and soaking the as-rolled carbon steel (ARCS) at 950 oC prior to quenching or cooling in different media at different selected temperatures between (20 and 250 oC) and atmospheric conditions. The microstructures and wear track patterns of specimens were evaluated using SEM and high-resolution metallurgical microscope. The sliding wear behaviour and wear track patterns of the specimens impressed under 10N normal loads and reciprocating mode was used to assess the wear damages. The obtained wear properties were compared in air and DOT4 fluid environments using Anton Paar TRB tribometer. The results obtained showed that enhanced wear behaviours were obtained from the oil and water quenched samples as compared with the air and furnace cooled samples. The HTRCSs samples are more tolerable than as-rolled sample (ARCS) under dry sliding. However, beside the influences of the heat treatments, the lubricating effect of DOT4 is more pronounced in the results. The CoF ranges from 0.105 to 0.137 for wet sliding while higher CoF values (0.378-0.934) were obtained in the dry sliding.
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Effect of heat treatment on wear behaviour of rolled carbon steel in DOT4 brake fluid

  • Authors: Ajibola, Olawale. O. , Akinribide, Ojo J. , Akinwamide, Samuel O. , Olubambi, Peter A.
  • Date: 2019
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/405099 , uj:34002 , Citation: Ajibola, O.O. et al. 2019. Effect of heat treatment on wear behaviour of rolled carbon steel in DOT4 brake fluid.
  • Description: Abstract: The wear of heat-treated rolled carbon steels (HTRCSs) were performed under dry and wet sliding in DOT4 brake fluid is successfully investigated and reported in the study. The HTRCSs samples were obtained by heating to and soaking the as-rolled carbon steel (ARCS) at 950 oC prior to quenching or cooling in different media at different selected temperatures between (20 and 250 oC) and atmospheric conditions. The microstructures and wear track patterns of specimens were evaluated using SEM and high-resolution metallurgical microscope. The sliding wear behaviour and wear track patterns of the specimens impressed under 10N normal loads and reciprocating mode was used to assess the wear damages. The obtained wear properties were compared in air and DOT4 fluid environments using Anton Paar TRB tribometer. The results obtained showed that enhanced wear behaviours were obtained from the oil and water quenched samples as compared with the air and furnace cooled samples. The HTRCSs samples are more tolerable than as-rolled sample (ARCS) under dry sliding. However, beside the influences of the heat treatments, the lubricating effect of DOT4 is more pronounced in the results. The CoF ranges from 0.105 to 0.137 for wet sliding while higher CoF values (0.378-0.934) were obtained in the dry sliding.
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Electrochemical corrosion behavior of copper in graphene-based thermal fluid with different surfactants

  • Authors: Borode, Adeola O. , Ahmed, Noor A. , Olubambi, Peter A.
  • Date: 2021
  • Subjects: Graphene Nanofluid , Potentiodynamic , Polarization
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/480878 , uj:43547 , Citation: Borode, A.O., Ahmed, N.A., Olubambi, P.A. 2021. Electrochemical corrosion behavior of copper in graphene-based thermal fluid with different surfactants. DOI: https://doi.org/10.1016/j.heliyon.2021.e05949
  • Description: Abstract: This study investigates the effect of different surfactant-dispersed graphene nanofluid on the electrochemical behavior of copper. This study was achieved by measuring the open circuit potential and potentiodynamic polarization of copper in the nanofluids at room temperature. The test media includes surfactant-free graphene nanofluid and graphene nanofluid dispersed using four different surfactants, which are sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, Gum Arabic, and Tween 80. The surface characterization and elemental composition of the copper sample before and after the corrosion tests were determined using a scanning electron microscope coupled with energy-dispersive X-ray spectroscopy. The phase formation after corrosion was also evaluated by measuring X-ray diffraction. The quantity of copper dissolved in the test media was evaluated using an inductively coupled plasma mass spectrometry (ICP-MS). The open-circuit potential measurements revealed that the current free corrosion potential of copper in the different surfactant-aided graphene nanofluids are different. The electrochemical corrosion potential, Tafel slopes, and corrosion rates revealed the better corrosion performance of copper in the nanofluid of different surfactants in the increasing order GA, SDS, Tween 80, and SDBS. Copper in GA-based graphene nanofluid was found to have the lowest corrosion rate while that of SDBS has the highest corrosion rate. However, the ICP-MS result revealed a discrepancy in the corrosion behavior and quantity of copper dissolved in the different test media. This could be attributed to the dissimilar dissolutionredeposition rate of copper in different media.
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Fabrication of forced air cool austempered ductile iron and exploring its corrosion behaviour in a simulated mine water

Influence of single and double-atom metal doping on the electrocatalytic hydrogen evolution activity of 2D-MoS2 surface

Initial reaction mechanism on the atomic layer deposition of platinum on a graphene surface : a density functional theory study

Stability Assessment of Pipeline Cathodic Protection Potentials under the Influence of AC Interference

Structural characterization and mechanical properties of pearlite – Enhanced micro-alloyed ductile irons

  • Authors: Omole, Sylvester O. , Akinlabi, Oyetunji , Alaneme, Kenneth K. , Olubambi, Peter A.
  • Date: 2020
  • Subjects: Alloying , Pearlite , Ferrite
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/451631 , uj:39804 , DOI: https://doi.org/10.1016/j.jksues.2018.11.008 , Citation: Omole, S.O. et al. 2020. Structural characterization and mechanical properties of pearlite – Enhanced micro-alloyed ductile irons.
  • Description: Abstract: The structural characteristic and mechanical properties of ductile irons micro alloyed with lean additions of molybdenum, nickel, copper and chromium was investigated. This was aimed at assessing the potentials of the utilization of lean ferro alloy additions (which offers reduced processing and product costs) for enhancing pearlite phase proportion, which is required for improved mechanical performance of ductile irons. The ductile irons contained a maximum of 0.2% each of Mo, Ni, Cu, and Cr and were processed using a crucible furnace. They were characterized using optical microscopy and X-ray diffractometry while hardness and tensile testings were used to evaluate the mechanical properties. The results show that the micro alloyed samples contain new compound of alloying elements with iron and the base alloy phase (FeSi, a Fe). It was also observed that the micro alloy additions resulted in significant increase in pearlite proportion from 30.63% in the base alloy to as much as 59.38% in the composition containing Mo, Ni and Cu as micro addition. Increase in hardness within the range 1.4–36.5% was obtained, while tensile strength increase within the range 35.89–80.55% with the use of the micro alloying additions. Overall, the best combination of mechanical properties was achieved for the ductile irons composition containing chromium and copper, as well as the one containing molybdenum, nickel and chromium as micro alloy additions.
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Structural characterization and mechanical properties of pearlite – enhanced micro-alloyed ductile irons

The effects of particle size distribution and sintering conditions on bending strength of sintered Ni-30þ alloys

Wear and corrosion of wrought a6061 aluminium alloy in dot3 brake fluid

Wear and Corrosion of Wrought A6061 Aluminium Alloy in DOT3 Brake Fluid

Wear behaviour of cast aluminium silicon (Al-Si) alloy in Dot 4 brake fluid

  • Authors: Ajibola, Olawale O. , Aribo, Sunday , Ige, Oladeji O. , Akinribide, Ojo J. , Akinwamide, Samuel O. , Olubambi, Peter A.
  • Date: 2019
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/403851 , uj:33858 , Citation: Olawale O Ajibola et al 2019 IOP Conf. Ser.: Mater. Sci. Eng. 628 012012
  • Description: Abstract: The frictional sliding behaviour of cast Al-Si alloy was investigated with and without DOT 4 hydraulic brake fluid lubrication/environments. Cast Al-Si specimen was produced from wrought alloy and the specimen surface was metallurgically prepared. The ascast product was characterized with aid of micro-hardness tester, the chemical composition was analysed by X-ray fluorescence (XRF), while X-ray diffraction (XRD) was used to identify phases present, microstructures and surface examinations were done on a high resolution metallurgical Optical Microscope. The properties of the polished and worn sample surfaces were examined by Scanning electron microscope (SEM) equipped with Energy dispersive Xray (EDS) facilities. A 6mm diameter alumina ball under varying normal loads (3-10 N) was rubbed against the surface of the cast Al-Si coupon specimen. The dry and wet sliding wear behaviour was assessed based on the CoF-sliding time behaviour. From the results, the average CoF values of 0.9064 for dry and 0.2038 for wet contacts were obtained. Comparatively, 1.03E-06 and 4.21E-07 minimum wear intensities; and 467290 and 132170 wear resistances were obtained for dry and wet contacts respectively. Behaviour of cast Al-Si in DOT4 were compared with its performance in DOT3 regarding the hydraulic brake system application.
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