Effects of processing parameters on the corrosion properties of dissimilar friction stir welds of aluminium and copper
- Akinlabi, Esther Titilayo, Anthony, Andrews, Akinlabi, Stephen A.
- Authors: Akinlabi, Esther Titilayo , Anthony, Andrews , Akinlabi, Stephen A.
- Date: 2013
- Subjects: Aluminium alloy , Copper , Corrosion , Friction stir welding
- Type: Article
- Identifier: uj:5019 , http://hdl.handle.net/10210/13159
- Description: The influence of friction stir welding processing parameters on dissimilar joints conducted between aluminium alloy (AA5754) and commercially pure copper (C11000) was studied. The welds were produced by varying the rotational speed from 600 to 1200 r/min and the feed rate from 50 to 300 mm/min. The resulting microstructure and the corrosion properties of the welds produced were studied. It was found that the joint interfacial regions of the welds were characterized by interlayers of aluminium and copper. The corrosion tests revealed that the corrosion resistance of the welds was improved as the rotational speed was increased. The corrosion rates of the welds compared to the base metals were improved compared with Cu and decreased slightly compared with the aluminium alloy. The lowest corrosion rate was obtained at welds produced at rotational speed of 950 r/min and feed rate of 300 mm/min which corresponds to a weld produced at a low heat input.
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- Authors: Akinlabi, Esther Titilayo , Anthony, Andrews , Akinlabi, Stephen A.
- Date: 2013
- Subjects: Aluminium alloy , Copper , Corrosion , Friction stir welding
- Type: Article
- Identifier: uj:5019 , http://hdl.handle.net/10210/13159
- Description: The influence of friction stir welding processing parameters on dissimilar joints conducted between aluminium alloy (AA5754) and commercially pure copper (C11000) was studied. The welds were produced by varying the rotational speed from 600 to 1200 r/min and the feed rate from 50 to 300 mm/min. The resulting microstructure and the corrosion properties of the welds produced were studied. It was found that the joint interfacial regions of the welds were characterized by interlayers of aluminium and copper. The corrosion tests revealed that the corrosion resistance of the welds was improved as the rotational speed was increased. The corrosion rates of the welds compared to the base metals were improved compared with Cu and decreased slightly compared with the aluminium alloy. The lowest corrosion rate was obtained at welds produced at rotational speed of 950 r/min and feed rate of 300 mm/min which corresponds to a weld produced at a low heat input.
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Data on triethylenetetramine effect on steel‐rebar corrosion‐rate in concrete immersed in 0.5 M H2SO4
- Okeniyi, Joshua Olusegun, Akinlabi, Esther Titilayo, Ikotun, Jacob Olumuyiwa, Akinlabi, Stephen Akinwale, Okeniyi, Elizabeth Toyin
- Authors: Okeniyi, Joshua Olusegun , Akinlabi, Esther Titilayo , Ikotun, Jacob Olumuyiwa , Akinlabi, Stephen Akinwale , Okeniyi, Elizabeth Toyin
- Date: 2018
- Subjects: Corrosion , Reinforcing‐steel , Steel‐reinforced‐concrete
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290929 , uj:31591 , Citation: Okeniyi, J.O. et al. 2018. Data on triethylenetetramine effect on steel‐rebar corrosion‐rate in concrete immersed in 0.5 M H2SO4.
- Description: Abstract: In this article, the dataset on the effect of different triethylenetetramine (TETA: C6H18N4) concentrations on the corrosion‐rate of steel‐rebar embedment in steel‐reinforced concrete immersed in 0.5 M H2SO4 (for simulating industrial/microbial environment) is presented. The corrosion test‐data was obtained from weekly monitoring, over seven weeks of steel‐reinforced concrete immersion, using linear‐polarizationresistance (LPR) measuring instrument. The dataset and its requisite analyses, as per ASTM G16—13, are presented in graphs and tables. The analyses detailed include descriptive statistics of the Normal, Gumbel and Weibull probability distribution functions (pdf’s), and tests‐of‐fit significance by the Kolmogorov‐ Smirnov goodness‐of‐fit statistics. The detailed information from this corrosion tests dataset is useful for further research on the inhibition mechanism and effectiveness of the triethylenetetramine chemical on the corrosion‐protection of reinforcing‐steel material in steel‐reinforced concrete designed for the industrial/microbial service‐environment.
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- Authors: Okeniyi, Joshua Olusegun , Akinlabi, Esther Titilayo , Ikotun, Jacob Olumuyiwa , Akinlabi, Stephen Akinwale , Okeniyi, Elizabeth Toyin
- Date: 2018
- Subjects: Corrosion , Reinforcing‐steel , Steel‐reinforced‐concrete
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290929 , uj:31591 , Citation: Okeniyi, J.O. et al. 2018. Data on triethylenetetramine effect on steel‐rebar corrosion‐rate in concrete immersed in 0.5 M H2SO4.
- Description: Abstract: In this article, the dataset on the effect of different triethylenetetramine (TETA: C6H18N4) concentrations on the corrosion‐rate of steel‐rebar embedment in steel‐reinforced concrete immersed in 0.5 M H2SO4 (for simulating industrial/microbial environment) is presented. The corrosion test‐data was obtained from weekly monitoring, over seven weeks of steel‐reinforced concrete immersion, using linear‐polarizationresistance (LPR) measuring instrument. The dataset and its requisite analyses, as per ASTM G16—13, are presented in graphs and tables. The analyses detailed include descriptive statistics of the Normal, Gumbel and Weibull probability distribution functions (pdf’s), and tests‐of‐fit significance by the Kolmogorov‐ Smirnov goodness‐of‐fit statistics. The detailed information from this corrosion tests dataset is useful for further research on the inhibition mechanism and effectiveness of the triethylenetetramine chemical on the corrosion‐protection of reinforcing‐steel material in steel‐reinforced concrete designed for the industrial/microbial service‐environment.
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Effects of ternary metal additions on corrosion of spark plasma sintered Ni-Fe alloys in H2SO4 and NaCl
- Shongwe, Mxolisi Brendon, Makena, Isaac Moraka, Ajibola, Olawale Olarewaju, Olubambi, Peter Apata, Adams, Feyisayo Victoria
- Authors: Shongwe, Mxolisi Brendon , Makena, Isaac Moraka , Ajibola, Olawale Olarewaju , Olubambi, Peter Apata , Adams, Feyisayo Victoria
- Date: 2018
- Subjects: Spark plasma sintering , Corrosion , Ni-Fe based alloy
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/279685 , uj:30039 , Citation: Shongwe, M.B. et al. 2018. Effects of ternary metal additions on corrosion of spark plasma sintered Ni-Fe alloys in H2SO4 and NaCl. Bulletin of the Chemical Society of Ethiopia, 32(2), 337-349. DOI: https://dx.doi.org/10.4314/bcse.v32i2.12 , ISSN 1011-3924
- Description: Abstract: Effect of ternary additions on electrochemical behavior of Ni-Fe binary alloys developed by Spark Plasma Sintering (SPS) were investigated and reported. All specimens revealed common passivity behavior in H2SO4. Both binary and ternary alloys did not reveal passivity region under saline conditions. The alloys have lower corrosion rates in NaCl than in H2SO4. Binary Ni50Fe50 alloy is characterized by large pits in H2SO4 and homogeneous corrosion on surface in NaCl. Ni50Fe40Ta10 shows better passivity in 1 M H2SO4 and Ni50Fe40Al10 has the lowest corrosion rate in 3.5 wt.% NaCl.
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- Authors: Shongwe, Mxolisi Brendon , Makena, Isaac Moraka , Ajibola, Olawale Olarewaju , Olubambi, Peter Apata , Adams, Feyisayo Victoria
- Date: 2018
- Subjects: Spark plasma sintering , Corrosion , Ni-Fe based alloy
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/279685 , uj:30039 , Citation: Shongwe, M.B. et al. 2018. Effects of ternary metal additions on corrosion of spark plasma sintered Ni-Fe alloys in H2SO4 and NaCl. Bulletin of the Chemical Society of Ethiopia, 32(2), 337-349. DOI: https://dx.doi.org/10.4314/bcse.v32i2.12 , ISSN 1011-3924
- Description: Abstract: Effect of ternary additions on electrochemical behavior of Ni-Fe binary alloys developed by Spark Plasma Sintering (SPS) were investigated and reported. All specimens revealed common passivity behavior in H2SO4. Both binary and ternary alloys did not reveal passivity region under saline conditions. The alloys have lower corrosion rates in NaCl than in H2SO4. Binary Ni50Fe50 alloy is characterized by large pits in H2SO4 and homogeneous corrosion on surface in NaCl. Ni50Fe40Ta10 shows better passivity in 1 M H2SO4 and Ni50Fe40Al10 has the lowest corrosion rate in 3.5 wt.% NaCl.
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Tribocorrosion behaviours of AISI 310 and AISI 316 austenitic stainless steels in 3.5% NaCl solution
- Obadele, Babatunde Abiodun, Andrews, Anthony, Shongwe, Mxolisi Brendon, Olubambi, Peter Apata
- Authors: Obadele, Babatunde Abiodun , Andrews, Anthony , Shongwe, Mxolisi Brendon , Olubambi, Peter Apata
- Date: 2016
- Subjects: Metals , Electrochemical techniques , Corrosion
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/123414 , uj:20788 , Citation: Obadele, B.A. et al. 2016. Tribocorrosion behaviours of AISI 310 and AISI 316 austenitic stainless steels in 3.5% NaCl solution.
- Description: Abstract: In this paper the tribocorrosion behaviours of AISI 310 and AISI 316 stainless steels have been studied under reciprocating sliding condition in 3.5% NaCl solution, using a pin-on-disk tribometer integrated with a potentiostat for electrochemical control. Different sliding loads were used at a constant rotational speed of 60 rpm. The results show that sliding load has significant effect on the tribocorrosion behaviour of both materials. Corrosion attack was severe at sliding load conditions in both materials suggesting corrosion-induced wear as the dominant of the two synergistic components. However, at low sliding load, anodic dissolution and pit formation in AISI 316 was accelerated by sliding action causing wear-induced corrosion to be dominant.
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Tribocorrosion behaviours of AISI 310 and AISI 316 austenitic stainless steels in 3.5% NaCl solution
- Authors: Obadele, Babatunde Abiodun , Andrews, Anthony , Shongwe, Mxolisi Brendon , Olubambi, Peter Apata
- Date: 2016
- Subjects: Metals , Electrochemical techniques , Corrosion
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/123414 , uj:20788 , Citation: Obadele, B.A. et al. 2016. Tribocorrosion behaviours of AISI 310 and AISI 316 austenitic stainless steels in 3.5% NaCl solution.
- Description: Abstract: In this paper the tribocorrosion behaviours of AISI 310 and AISI 316 stainless steels have been studied under reciprocating sliding condition in 3.5% NaCl solution, using a pin-on-disk tribometer integrated with a potentiostat for electrochemical control. Different sliding loads were used at a constant rotational speed of 60 rpm. The results show that sliding load has significant effect on the tribocorrosion behaviour of both materials. Corrosion attack was severe at sliding load conditions in both materials suggesting corrosion-induced wear as the dominant of the two synergistic components. However, at low sliding load, anodic dissolution and pit formation in AISI 316 was accelerated by sliding action causing wear-induced corrosion to be dominant.
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Effect of [Tris(trimethylsiloxy)silyethyl]dimethylchlorosilane on the corrosion protection enhancement of hydrophobic film coated on AISI 304
- Baruwa, A.D., Akinlabi, Esther Titilayo, Oladijo, O.P., Maledi, N., Chinn, J.
- Authors: Baruwa, A.D. , Akinlabi, Esther Titilayo , Oladijo, O.P. , Maledi, N. , Chinn, J.
- Date: 2018
- Subjects: AISI 304 , Corrosion , Hydrophobic coating
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290905 , uj:31588 , Citation: Baruwa, A.D. et al. 2018. Effect of [Tris(trimethylsiloxy)silyethyl]dimethylchlorosilane on the corrosion protection enhancement of hydrophobic film coated on AISI 304.
- Description: Abstract: The effects of Organofunctional moieties and the adhesion properties of hydrophobic [Tris(trimethylsiloxy)silyethyl]dimethylchlorosilane (Alkyl)] coated on AISI 304 to determine the corrosion resistance were investigated and presented. Two different types of adhesion, namely: silicon oxide and plasma silicon oxide films were grown on AISI 304 with the aid of an atomic‐layer deposition technique. The effects of the surface preparations on the functionality and the properties of the hydrophobic silane coating were characterized, using the scanning electron microscope (SEM) and the atomic force microscope (AFM) for morphology and topography. X‐ray diffraction (XRD) and attenuated Fourier‐transform infrared (FTIR‐ATR) were used for the chemical composition and the bonding structure, the water contact angle were measured and processed, as well as the determination of electrochemistry of the coated and uncoated surfaces. The results showed that the silicon oxide treated surface improved the durability of the silane film in the corrosive medium; and that has more chemical stability with the coating, when compared with the plasma silicon oxide and base material, which was distinctly discussed.
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- Authors: Baruwa, A.D. , Akinlabi, Esther Titilayo , Oladijo, O.P. , Maledi, N. , Chinn, J.
- Date: 2018
- Subjects: AISI 304 , Corrosion , Hydrophobic coating
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290905 , uj:31588 , Citation: Baruwa, A.D. et al. 2018. Effect of [Tris(trimethylsiloxy)silyethyl]dimethylchlorosilane on the corrosion protection enhancement of hydrophobic film coated on AISI 304.
- Description: Abstract: The effects of Organofunctional moieties and the adhesion properties of hydrophobic [Tris(trimethylsiloxy)silyethyl]dimethylchlorosilane (Alkyl)] coated on AISI 304 to determine the corrosion resistance were investigated and presented. Two different types of adhesion, namely: silicon oxide and plasma silicon oxide films were grown on AISI 304 with the aid of an atomic‐layer deposition technique. The effects of the surface preparations on the functionality and the properties of the hydrophobic silane coating were characterized, using the scanning electron microscope (SEM) and the atomic force microscope (AFM) for morphology and topography. X‐ray diffraction (XRD) and attenuated Fourier‐transform infrared (FTIR‐ATR) were used for the chemical composition and the bonding structure, the water contact angle were measured and processed, as well as the determination of electrochemistry of the coated and uncoated surfaces. The results showed that the silicon oxide treated surface improved the durability of the silane film in the corrosive medium; and that has more chemical stability with the coating, when compared with the plasma silicon oxide and base material, which was distinctly discussed.
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Field investigation of slab deterioration due to carbonation in a concrete building
- Araya, Eleni B, Ekolu, Stephen
- Authors: Araya, Eleni B , Ekolu, Stephen
- Date: 2019
- Subjects: Carbonation , Cover , Corrosion
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/407006 , uj:34242 , Citation: Araya, E.B., Ekolu, S. 2019 : Field investigation of slab deterioration due to carbonation in a concrete building.
- Description: Abstract : This paper presents an investigation on a deteriorated slab of a two-story building located in Johannesburg, South Africa. The structure has been in use as a residential building for more than 60 years. The top slab of the first floor was delaminated and reinforcement bars were severely corroded. Condition assessment of the building was done using the Schmidt hammer test, cover-meter survey and half-cell potential measurements. In addition to the non-destructive tests done, X-ray diffraction and scanning electron microscopy were also conducted on the deteriorated concrete.
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- Authors: Araya, Eleni B , Ekolu, Stephen
- Date: 2019
- Subjects: Carbonation , Cover , Corrosion
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/407006 , uj:34242 , Citation: Araya, E.B., Ekolu, S. 2019 : Field investigation of slab deterioration due to carbonation in a concrete building.
- Description: Abstract : This paper presents an investigation on a deteriorated slab of a two-story building located in Johannesburg, South Africa. The structure has been in use as a residential building for more than 60 years. The top slab of the first floor was delaminated and reinforcement bars were severely corroded. Condition assessment of the building was done using the Schmidt hammer test, cover-meter survey and half-cell potential measurements. In addition to the non-destructive tests done, X-ray diffraction and scanning electron microscopy were also conducted on the deteriorated concrete.
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