Comparative effects of corrosion on electroless-nickel plated A6061 alloys in DOT3 brake fluid
- Ajibola, Olawale O., Olubambi, Peter A.
- Authors: Ajibola, Olawale O. , Olubambi, Peter A.
- Date: 2018
- Subjects: Corrosive Wear , Aluminum Substrate , Hydraulic Brake Fluid
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/291239 , uj:31623 , Citation: Ajibola, O.O. & Olubambi, P.A. 2018. Comparative effects of corrosion on electroless-nickel plated A6061 alloys in DOT3 brake fluid. International Journal of Engineering & Technology, 7 (2) (2018) 927-934.
- Description: Abstract: Aluminium alloys used in automobile brake master cylinder pistons wear by corrosion due to contamination and chemical reaction of the contacting brake fluid. The study investigates the corrosion of electroless-nickel (EN) deposition enhanced cast aluminium alloy master cylinder piston surfaces immersed in hydraulic brake oil. Cast specimens were produced from the as-received wrought A6061 alloy scrap by sand casting. EN plated as-received and cast aluminium alloys specimens were immersed fully in brake oil for 1680 hours and corrosion rates were determined every 24 hours. Test samples were characterised using the hardness tester, atomic absorption spectrometer, metallurgical photo-microscope, x-ray diffractometer; and SEM with EDX attachment. Both surfaces corroded in the order of electroless-nickel plated cast aluminium alloy (ENCA) < electroless-nickel plated as-received aluminium alloy (ENAA) at 0.0235 and 0.0251 rates (mg/mm2/y) results which showed improvement in the corrosion resistance with significant influence of electroless-nickel coating in reducing corrosion rates of aluminium alloy in brake oil.
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- Authors: Ajibola, Olawale O. , Olubambi, Peter A.
- Date: 2018
- Subjects: Corrosive Wear , Aluminum Substrate , Hydraulic Brake Fluid
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/291239 , uj:31623 , Citation: Ajibola, O.O. & Olubambi, P.A. 2018. Comparative effects of corrosion on electroless-nickel plated A6061 alloys in DOT3 brake fluid. International Journal of Engineering & Technology, 7 (2) (2018) 927-934.
- Description: Abstract: Aluminium alloys used in automobile brake master cylinder pistons wear by corrosion due to contamination and chemical reaction of the contacting brake fluid. The study investigates the corrosion of electroless-nickel (EN) deposition enhanced cast aluminium alloy master cylinder piston surfaces immersed in hydraulic brake oil. Cast specimens were produced from the as-received wrought A6061 alloy scrap by sand casting. EN plated as-received and cast aluminium alloys specimens were immersed fully in brake oil for 1680 hours and corrosion rates were determined every 24 hours. Test samples were characterised using the hardness tester, atomic absorption spectrometer, metallurgical photo-microscope, x-ray diffractometer; and SEM with EDX attachment. Both surfaces corroded in the order of electroless-nickel plated cast aluminium alloy (ENCA) < electroless-nickel plated as-received aluminium alloy (ENAA) at 0.0235 and 0.0251 rates (mg/mm2/y) results which showed improvement in the corrosion resistance with significant influence of electroless-nickel coating in reducing corrosion rates of aluminium alloy in brake oil.
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Effect of heat treatment on wear behaviour of rolled carbon steel in DOT4 brake fluid
- Ajibola, Olawale O., Akinribide, Ojo J., Akinwamide, Samuel O., Olubambi, Peter A.
- 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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- 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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The effects of particle size distribution and sintering conditions on bending strength of sintered Ni-30þ alloys
- Shongwe, Mxolisi B., Ajibola, Olawale O., Ramakokovhu, Munyadziwa M., Olubambi, Peter A.
- Authors: Shongwe, Mxolisi B. , Ajibola, Olawale O. , Ramakokovhu, Munyadziwa M. , Olubambi, Peter A.
- Date: 2018
- Subjects: Sintering , Grains , Bending Strength
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/291248 , uj:31624 , Citation: Shongwe, M.B. et al. The effects of particle size distribution and sintering conditions on bending strength of sintered Ni-30þ alloys. International Journal of Engineering & Technology, 7 (3) (2018) 1581-1584.
- Description: Abstract: Please refer to full text to view abstract.
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- Authors: Shongwe, Mxolisi B. , Ajibola, Olawale O. , Ramakokovhu, Munyadziwa M. , Olubambi, Peter A.
- Date: 2018
- Subjects: Sintering , Grains , Bending Strength
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/291248 , uj:31624 , Citation: Shongwe, M.B. et al. The effects of particle size distribution and sintering conditions on bending strength of sintered Ni-30þ alloys. International Journal of Engineering & Technology, 7 (3) (2018) 1581-1584.
- Description: Abstract: Please refer to full text to view abstract.
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Wear and corrosion of wrought a6061 aluminium alloy in dot3 brake fluid
- Ajibola, Olawale O., Ige, Oladeji O., Olubambi, Peter A.
- Authors: Ajibola, Olawale O. , Ige, Oladeji O. , Olubambi, Peter A.
- Date: 2018
- Subjects: Hydraulic Brake Fluid , Piston Application , Wear
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/263343 , uj:27838 , Citation: Ajibola, O.O., Ige, O.O. & Olubambi, P.A. 2018. Wear and corrosion of wrought a6061 aluminium alloy in dot3 brake fluid. International Journal of Engineering & Technology, 7 (2):512-519.
- Description: Abstract: The twofold impact of wear and corrosion on wrought A6061 alloy in hydraulic DOT3 brake fluid environment was studied. The wear studies were performed on the samples using a developed wear-jig. Weight loss corrosion test method was used to determine the corrosion rate of the wrought A6061 alloy samples immersed in the brake fluid for a total of 1680 hours. From the results of wear tests carried out on the A6061 alloy sample with brake oil, the highest wear value of 5.24x10-7 mg/mm2/cycle (approx.) was obtained from 6 N (approx) force after 130 minutes. The wrought A6061 alloy material demonstrated the highest corrosion rates nearly 3.0 x10-2 mg/mm2/yr within the early 168 hours of immersion in brake fluid. The result is practically lower than the corrosion rate of cast specimen in DOT3 brake oil or some other alloys immersed in other corrosive media that were previously reported in the literature. The results show that small amount of chemical corrosion is sufficient to cause and accelerate mechanical wear of the material in usage.
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- Authors: Ajibola, Olawale O. , Ige, Oladeji O. , Olubambi, Peter A.
- Date: 2018
- Subjects: Hydraulic Brake Fluid , Piston Application , Wear
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/263343 , uj:27838 , Citation: Ajibola, O.O., Ige, O.O. & Olubambi, P.A. 2018. Wear and corrosion of wrought a6061 aluminium alloy in dot3 brake fluid. International Journal of Engineering & Technology, 7 (2):512-519.
- Description: Abstract: The twofold impact of wear and corrosion on wrought A6061 alloy in hydraulic DOT3 brake fluid environment was studied. The wear studies were performed on the samples using a developed wear-jig. Weight loss corrosion test method was used to determine the corrosion rate of the wrought A6061 alloy samples immersed in the brake fluid for a total of 1680 hours. From the results of wear tests carried out on the A6061 alloy sample with brake oil, the highest wear value of 5.24x10-7 mg/mm2/cycle (approx.) was obtained from 6 N (approx) force after 130 minutes. The wrought A6061 alloy material demonstrated the highest corrosion rates nearly 3.0 x10-2 mg/mm2/yr within the early 168 hours of immersion in brake fluid. The result is practically lower than the corrosion rate of cast specimen in DOT3 brake oil or some other alloys immersed in other corrosive media that were previously reported in the literature. The results show that small amount of chemical corrosion is sufficient to cause and accelerate mechanical wear of the material in usage.
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Wear and Corrosion of Wrought A6061 Aluminium Alloy in DOT3 Brake Fluid
- Ajibola, Olawale O., Ige, Oladeji O., Olubambi, Peter A.
- Authors: Ajibola, Olawale O. , Ige, Oladeji O. , Olubambi, Peter A.
- Date: 2018
- Subjects: Hydraulic Brake Fluid , Piston Application , Wear
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/279684 , uj:30040 , Citation: Ajibola, O.O., Ige, O.O. & Olubambi, P.A. 2018. Wear and Corrosion of Wrought A6061 Aluminium Alloy in DOT3 Brake Fluid. International Journal of Engineering & Technology, 7 (2) (2018):512-519.
- Description: Abstract: The twofold impact of wear and corrosion on wrought A6061 alloy in hydraulic DOT3 brake fluid environment was studied. The wear studies were performed on the samples using a developed wear-jig. Weight loss corrosion test method was used to determine the corrosion rate of the wrought A6061 alloy samples immersed in the brake fluid for a total of 1680 hours. From the results of wear tests carried out on the A6061 alloy sample with brake oil, the highest wear value of 5.24x10-7 mg/mm2/cycle (approx.) was obtained from 6 N (approx) force after 130 minutes. The wrought A6061 alloy material demonstrated the highest corrosion rates nearly 3.0 x10-2 mg/mm2/yr within the early 168 hours of immersion in brake fluid. The result is practically lower than the corrosion rate of cast specimen in DOT3 brake oil or some other alloys immersed in other corrosive media that were previously reported in the literature. The results show that small amount of chemical corrosion is sufficient to cause and accelerate mechanical wear of the material in usage.
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- Authors: Ajibola, Olawale O. , Ige, Oladeji O. , Olubambi, Peter A.
- Date: 2018
- Subjects: Hydraulic Brake Fluid , Piston Application , Wear
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/279684 , uj:30040 , Citation: Ajibola, O.O., Ige, O.O. & Olubambi, P.A. 2018. Wear and Corrosion of Wrought A6061 Aluminium Alloy in DOT3 Brake Fluid. International Journal of Engineering & Technology, 7 (2) (2018):512-519.
- Description: Abstract: The twofold impact of wear and corrosion on wrought A6061 alloy in hydraulic DOT3 brake fluid environment was studied. The wear studies were performed on the samples using a developed wear-jig. Weight loss corrosion test method was used to determine the corrosion rate of the wrought A6061 alloy samples immersed in the brake fluid for a total of 1680 hours. From the results of wear tests carried out on the A6061 alloy sample with brake oil, the highest wear value of 5.24x10-7 mg/mm2/cycle (approx.) was obtained from 6 N (approx) force after 130 minutes. The wrought A6061 alloy material demonstrated the highest corrosion rates nearly 3.0 x10-2 mg/mm2/yr within the early 168 hours of immersion in brake fluid. The result is practically lower than the corrosion rate of cast specimen in DOT3 brake oil or some other alloys immersed in other corrosive media that were previously reported in the literature. The results show that small amount of chemical corrosion is sufficient to cause and accelerate mechanical wear of the material in usage.
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Wear behaviour of cast aluminium silicon (Al-Si) alloy in Dot 4 brake fluid
- Ajibola, Olawale O., Aribo, Sunday, Ige, Oladeji O., Akinribide, Ojo J., Akinwamide, Samuel O., Olubambi, Peter A.
- 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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- 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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