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Dr. Ime Baseey Obot
Centre of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia

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0 sweet corrosion
0 computational material science
0 Corrosion and scale inhibition
0 Sour corrosion
0 Corrosion in cooling water systems

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sweet corrosion
Sour corrosion

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Journal article
Published: 09 June 2021 in Journal of Molecular Structure
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The ethanol extract of bamboo shoots was obtained by refluxing bamboo shoots in 95 % ethanol, and then the ethanol extract from bamboo shoots were separated by organic solvents with different polarity, including petroleum ether, dichloromethane, ethyl acetate and n-butanol. The inhibitive effect of different solvent extraction fractions of bamboo shoot extract on the corrosion of mild steel in 0.5 mol/L H2SO4 solution was investigated through electrochemical technique, weight loss test, scanning electron microscope and X-ray photoelectron spectroscopy. Electrochemical results showed that all extraction fractions of bamboo shoots extract, as modest cathodic inhibitors, mainly inhibited the cathodic reaction of mild steel in 0.5 mol/L H2SO4 solution, and the inhibition efficiency of extraction fraction increased with the increase in its concentration. When the concentration was 0.4 g/L, the corrosion inhibition efficiency of dichloromethane fraction (DCMF), n-butanol fraction (nBF), ethyl acetate fraction (EAF) and the residual fraction (RF) are 93.03%, 89.62%, 85.33% and 64.84%, respectively. However, the results of weight loss experiment showed that when the experimental time increased from 4 h to 24 h, the inhibition efficiency of DCMF and EAF decreased significantly, but that of nBF remained at about 86%, showing a better long-term effect. Surface analysis technology was used to investigate the corrosion inhibition and adsorption behavior of the extraction extraction fractions, and the adsorption of different solvent extraction fractions of bamboo shoot ethanol extract on mild steel surface was in accordance with the equation of Langmuir isotherm.

ACS Style

Lin Zhu; Jinlong Fan; Hui Huang; Lei Guo; Mengyue Zhu; Xingwen Zheng; Ime Bassey Obot. Inhibitive effect of different solvent fractions of bamboo shoots extract on the corrosion of mild steel in 0.5 mol/L H2SO4 solution. Journal of Molecular Structure 2021, 1243, 130852 .

AMA Style

Lin Zhu, Jinlong Fan, Hui Huang, Lei Guo, Mengyue Zhu, Xingwen Zheng, Ime Bassey Obot. Inhibitive effect of different solvent fractions of bamboo shoots extract on the corrosion of mild steel in 0.5 mol/L H2SO4 solution. Journal of Molecular Structure. 2021; 1243 ():130852.

Chicago/Turabian Style

Lin Zhu; Jinlong Fan; Hui Huang; Lei Guo; Mengyue Zhu; Xingwen Zheng; Ime Bassey Obot. 2021. "Inhibitive effect of different solvent fractions of bamboo shoots extract on the corrosion of mild steel in 0.5 mol/L H2SO4 solution." Journal of Molecular Structure 1243, no. : 130852.

Review article
Published: 02 June 2021 in Engineering Failure Analysis
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Ethyl acetate (EA) production plants is among the many industrial facilities where corrosion is a major concern. EA plant suffers from various forms of corrosion because of the simultaneous use of strong mineral acids, high temperature and flow environment, presence of aqueous environment, and feedstock contamination. Stainless steels, which are mostly used in EA plants, owed their protective characteristics to their metallurgical composition and the characteristic to form a thin passive oxide layer upon exposure to the atmosphere. However, mineral acids and chloride attacks and the subsequent breakdown of passive films have resulted in continuous corrosion challenges in EA plants. The involvement of various corrosive factors in EA plants has worsened the corrosion problems and often complicate understanding the sources/causes of corrosion. This review article discusses the various corrosion problems, causes, mechanisms, as well as control and preventive strategies in ethyl acetate production and related processes. The influence of strong organic and inorganic acids, such as H2SO4, MSA, HNO3, acetic acid, and formic acid were discussed based on their corrosiveness on stainless steel. Furthermore, this article highlights the corrosion types, management, and monitoring methods within EA plants. Finally, the existing knowledge gaps and future research directions are outlined.

ACS Style

Akeem Y. Adesina; I.B. Obot; Ahmad. A. Sorour; Sibusiso Mtongana; Sekhar B. Mamilla; Abdulaziz A. Almathami. Corrosion challenges and prevention in Ethyl Acetate (EA) production and related processes – An overview. Engineering Failure Analysis 2021, 127, 105511 .

AMA Style

Akeem Y. Adesina, I.B. Obot, Ahmad. A. Sorour, Sibusiso Mtongana, Sekhar B. Mamilla, Abdulaziz A. Almathami. Corrosion challenges and prevention in Ethyl Acetate (EA) production and related processes – An overview. Engineering Failure Analysis. 2021; 127 ():105511.

Chicago/Turabian Style

Akeem Y. Adesina; I.B. Obot; Ahmad. A. Sorour; Sibusiso Mtongana; Sekhar B. Mamilla; Abdulaziz A. Almathami. 2021. "Corrosion challenges and prevention in Ethyl Acetate (EA) production and related processes – An overview." Engineering Failure Analysis 127, no. : 105511.

Journal article
Published: 17 May 2021 in Sustainability
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The quest to replace toxic chemicals in the nearest future is revolutionizing the corrosion inhibitor research world by turning its attention to plant biomaterials. Herein, we report the corrosion inhibiting potential of butanolic extract of date palm leaves (BUT) on the corrosion of API 5L X60 carbon steel in 15 wt.% HCl solution. The mass loss, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), linear polarization (LPR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDAX), and atomic force microscopy (AFM) techniques were employed in the investigation. We also report the effect of intensifier additives, namely formic acid (FA), potassium iodide (KI), and zinc nitrate (Zn(NO3)2) as well as temperature on the corrosion inhibiting performance of BUT. BUT exhibits inhibiting ability but the extent of inhibition is dependent on concentration, temperature, and intensifiers’ concentration. At 25 °C, 200 mg/L BUT and 700 mg/L BUT protected the carbon steel surface by 50% and 88%, respectively. The addition of 3 mM FA and 5 mM KI to 200 mg/L upgraded the extract performance to 97% and 95%, respectively. Zn(NO3)2 performs poorly as an intensifier for BUT under acidizing conditions. The adsorption of BUT + FA and BUT + KI is synergistic in nature whereas that of BUT + Zn(NO3)2 drifts towards antagonistic behavior according to the calculated synergism parameter. Increase in the system temperature resulted in a slight decline in the inhibition efficiency of BUT + FA and BUT + KI but with efficiency of above 85% achieved at 60 °C. The SEM and AFM results corroborate results from the electrochemical techniques.

ACS Style

Saviour Umoren; Moses Solomon; Ime Obot; Rami Suleiman. Effect of Intensifier Additives on the Performance of Butanolic Extract of Date Palm Leaves against the Corrosion of API 5L X60 Carbon Steel in 15 wt.% HCl Solution. Sustainability 2021, 13, 5569 .

AMA Style

Saviour Umoren, Moses Solomon, Ime Obot, Rami Suleiman. Effect of Intensifier Additives on the Performance of Butanolic Extract of Date Palm Leaves against the Corrosion of API 5L X60 Carbon Steel in 15 wt.% HCl Solution. Sustainability. 2021; 13 (10):5569.

Chicago/Turabian Style

Saviour Umoren; Moses Solomon; Ime Obot; Rami Suleiman. 2021. "Effect of Intensifier Additives on the Performance of Butanolic Extract of Date Palm Leaves against the Corrosion of API 5L X60 Carbon Steel in 15 wt.% HCl Solution." Sustainability 13, no. 10: 5569.

Review article
Published: 22 March 2021 in Arabian Journal of Chemistry
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Top of the line corrosion (TLC) is a phenomenon of global importance in the crude oil and gas extraction industry and is particularly a source of problems for both offshore and onshore fields. It is often responsible for accelerated corrosion rates, loss of mechanical integrity and catastrophic failures in wet gas pipelines. This form of corrosion cost the oil and gas industry millions of dollars in maintenance and replacement works. The use of corrosion inhibitors is one of the most efficient methods of TLC mitigation and is still an active research area in both the academic and industrial sectors. However, the literature report of TLC mitigation using corrosion inhibitors is relatively scarce. There is limited literature on mitigation of TLC using corrosion inhibitors. A comprehensive and up-to-date review of TLC inhibitors is timely. In the present work, we reviewed scientific research publications related to causes, mechanisms, and mitigation using corrosion inhibitors reported for TLC from 1990 to 2020. Nitrogen-based compounds are the most widely used inhibitor chemistries. Existing critical knowledge gaps have been identified, and future research directions have also been highlighted.

ACS Style

Aisha H. Al-Moubaraki; I.B. Obot. Top of the line corrosion: causes, mechanisms, and mitigation using corrosion inhibitors. Arabian Journal of Chemistry 2021, 14, 103116 .

AMA Style

Aisha H. Al-Moubaraki, I.B. Obot. Top of the line corrosion: causes, mechanisms, and mitigation using corrosion inhibitors. Arabian Journal of Chemistry. 2021; 14 (5):103116.

Chicago/Turabian Style

Aisha H. Al-Moubaraki; I.B. Obot. 2021. "Top of the line corrosion: causes, mechanisms, and mitigation using corrosion inhibitors." Arabian Journal of Chemistry 14, no. 5: 103116.

Journal article
Published: 26 February 2021 in Journal of Molecular Structure
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Thioglycoluril (3a,6a−bistolylthioglycoluril (BSTGCU)) was first introduced as a new and green corrosion inhibitor for low carbon steel in a 1 M HCl medium. The inhibition properties of BSTGCU in a 1 M HCl were fully characterised by the gravimetric, thermodynamic, potentiodynamic polarisation (PDP), electrochemical impedance spectroscopy (EIS), electrochemical noise (EN), electrochemical frequency modulation (EFM), density functional theory (DFT), molecular dynamics (MD) simulations, scanning electron microscopy (SEM) and energy dispersive X−ray spectrometry (EDX) methods. The experimental results confirmed that the maximum inhibition efficiency of BSTGCU was over 96% at 100 mg/L in a 1 M HCl medium. The electrochemical results indicated that BSTGCU acted as a mixed−type inhibitor and spontaneously adsorbed on the metal surface by physical and chemical adsorption mechanisms according to its Langmuir adsorption isotherms. The SEM−EDX results of the inhibited steel sample revealed that the surface morphology was significantly improved with the presence of inhibitor. Theoretical calculations confirmed that the inhibition properties depended on the molecular structure of BSTGCU, and its inhibition performance was better in its protonated form than in its neutral form in the aqueous phase.

ACS Style

Elyor Berdimurodov; Abduvali Kholikov; Khamdam Akbarov; I.B. Obot; Lei Guo. Thioglycoluril derivative as a new and effective corrosion inhibitor for low carbon steel in a 1 M HCl medium: Experimental and theoretical investigation. Journal of Molecular Structure 2021, 1234, 130165 .

AMA Style

Elyor Berdimurodov, Abduvali Kholikov, Khamdam Akbarov, I.B. Obot, Lei Guo. Thioglycoluril derivative as a new and effective corrosion inhibitor for low carbon steel in a 1 M HCl medium: Experimental and theoretical investigation. Journal of Molecular Structure. 2021; 1234 ():130165.

Chicago/Turabian Style

Elyor Berdimurodov; Abduvali Kholikov; Khamdam Akbarov; I.B. Obot; Lei Guo. 2021. "Thioglycoluril derivative as a new and effective corrosion inhibitor for low carbon steel in a 1 M HCl medium: Experimental and theoretical investigation." Journal of Molecular Structure 1234, no. : 130165.

Article
Published: 18 February 2021 in Journal of Bio- and Tribo-Corrosion
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Under deposit corrosion (UDC) is a serious risk in the industry, threatening critical failures in oil and gas pipelines, boiler and heat exchanger tubes, cooling systems and wastewater treatment facilities. Generally speaking, there is no single defined mechanism for UDC as it follows any of many different routes depending on the local chemistry and the nature of the deposits involved. In addition, UDC is frequently combined with microbiologically influenced corrosion (MIC), which adds further complexity to the mechanism and enhances the resulting damage. At the moment, different mechanical and physical techniques are implemented in the industry to combat UDC with varying success. Mitigation of UDC is generally difficult and requires a detailed understanding of the species involved, the deposits present and, finally, the mechanism taking place. This paper aims to provide a brief review of the recent literature on UDC. First, the basic definition, corrosion mechanisms and types of deposits are discussed. Then, the relationship between deposit structure and corrosion mechanism and association with MIC are thoroughly explored. Finally, a general overview of the main mitigation approaches in the oil and gas industry is presented.

ACS Style

Ime Bassey Obot. Under-Deposit Corrosion on Steel Pipeline Surfaces: Mechanism, Mitigation and Current Challenges. Journal of Bio- and Tribo-Corrosion 2021, 7, 1 -14.

AMA Style

Ime Bassey Obot. Under-Deposit Corrosion on Steel Pipeline Surfaces: Mechanism, Mitigation and Current Challenges. Journal of Bio- and Tribo-Corrosion. 2021; 7 (2):1-14.

Chicago/Turabian Style

Ime Bassey Obot. 2021. "Under-Deposit Corrosion on Steel Pipeline Surfaces: Mechanism, Mitigation and Current Challenges." Journal of Bio- and Tribo-Corrosion 7, no. 2: 1-14.

Paper
Published: 11 January 2021 in RSC Advances
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Three novel N-hydrospiro-chromeno-carbonitriles, INH-1, INH-2 and INH-3 were synthesized using the principles of green chemistry and applied as corrosion inhibitors for mild steel in acidic medium using computational simulations and experimental methods.

ACS Style

Taiwo W. Quadri; Lukman O. Olasunkanmi; Ekemini D. Akpan; Akram Alfantazi; I. B. Obot; Chandrabhan Verma; Amal M. Al-Mohaimeed; Eno E. Ebenso; M. A. Quraishi. Chromeno-carbonitriles as corrosion inhibitors for mild steel in acidic solution: electrochemical, surface and computational studies. RSC Advances 2021, 11, 2462 -2475.

AMA Style

Taiwo W. Quadri, Lukman O. Olasunkanmi, Ekemini D. Akpan, Akram Alfantazi, I. B. Obot, Chandrabhan Verma, Amal M. Al-Mohaimeed, Eno E. Ebenso, M. A. Quraishi. Chromeno-carbonitriles as corrosion inhibitors for mild steel in acidic solution: electrochemical, surface and computational studies. RSC Advances. 2021; 11 (4):2462-2475.

Chicago/Turabian Style

Taiwo W. Quadri; Lukman O. Olasunkanmi; Ekemini D. Akpan; Akram Alfantazi; I. B. Obot; Chandrabhan Verma; Amal M. Al-Mohaimeed; Eno E. Ebenso; M. A. Quraishi. 2021. "Chromeno-carbonitriles as corrosion inhibitors for mild steel in acidic solution: electrochemical, surface and computational studies." RSC Advances 11, no. 4: 2462-2475.

Journal article
Published: 01 October 2020 in International Journal of Electrochemical Science
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ACS Style

I B. Obot. Correction to: “Experimental, DFT and QSAR models for the discovery of new pyrazines corrosion inhibitors for steel in oilfield acidizing environment” [ Int. J. Electrochem. Sci., 15 (2020) 9066 – 9080; doi: 10.20964/2020.09.72]. International Journal of Electrochemical Science 2020, 10649 -10652.

AMA Style

I B. Obot. Correction to: “Experimental, DFT and QSAR models for the discovery of new pyrazines corrosion inhibitors for steel in oilfield acidizing environment” [ Int. J. Electrochem. Sci., 15 (2020) 9066 – 9080; doi: 10.20964/2020.09.72]. International Journal of Electrochemical Science. 2020; ():10649-10652.

Chicago/Turabian Style

I B. Obot. 2020. "Correction to: “Experimental, DFT and QSAR models for the discovery of new pyrazines corrosion inhibitors for steel in oilfield acidizing environment” [ Int. J. Electrochem. Sci., 15 (2020) 9066 – 9080; doi: 10.20964/2020.09.72]." International Journal of Electrochemical Science , no. : 10649-10652.

Journal article
Published: 01 September 2020 in International Journal of Electrochemical Science
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ACS Style

I B. Obot. Experimental, DFT and QSAR models for the discovery of new pyrazines corrosion inhibitors for steel in oilfield acidizing environment. International Journal of Electrochemical Science 2020, 9066 -9080.

AMA Style

I B. Obot. Experimental, DFT and QSAR models for the discovery of new pyrazines corrosion inhibitors for steel in oilfield acidizing environment. International Journal of Electrochemical Science. 2020; ():9066-9080.

Chicago/Turabian Style

I B. Obot. 2020. "Experimental, DFT and QSAR models for the discovery of new pyrazines corrosion inhibitors for steel in oilfield acidizing environment." International Journal of Electrochemical Science , no. : 9066-9080.

Journal article
Published: 21 August 2020 in Desalination
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A green and cost-effective inhibitor based on Date palm leaves extract was formulated for use during acid cleaning of thermal desalination plants. The inhibitor formulation designated as F1 was tested against the corrosion of ferrous-based alloys namely: carbon steel, Ni-resist, and 316L stainless steel in 2% HCl solution at 40 °C under static and hydrodynamic conditions. Weight loss and electrochemical methods complemented with scanning electron microscopy were used in the study. Experiments were performed for 6, 24, and 72 h and the performance of F1 was compared with that of a commercial acid corrosion inhibitor. F1 exhibited excellent corrosion inhibition performance. Under static and dynamic conditions, 0.4% of F1 provided excellent corrosion inhibition up to 72 h and comparable to the commercial inhibitor performance. The inhibitors (F1 and the commercial one) exhibited a behavior typical of a mixed type corrosion inhibitor in the studied environment according to the potentiodynamic polarization. Results from cyclic potentiodynamic polarization experiments excluded pitting corrosion risk on the 316L stainless steel in the studied medium. Results from all applied techniques are in good agreement.

ACS Style

I.B. Obot; M.M. Solomon; I.B. Onyeachu; S.A. Umoren; Abdelkader Meroufel; A. Alenazi; A.A. Sorour. Development of a green corrosion inhibitor for use in acid cleaning of MSF desalination plant. Desalination 2020, 495, 114675 .

AMA Style

I.B. Obot, M.M. Solomon, I.B. Onyeachu, S.A. Umoren, Abdelkader Meroufel, A. Alenazi, A.A. Sorour. Development of a green corrosion inhibitor for use in acid cleaning of MSF desalination plant. Desalination. 2020; 495 ():114675.

Chicago/Turabian Style

I.B. Obot; M.M. Solomon; I.B. Onyeachu; S.A. Umoren; Abdelkader Meroufel; A. Alenazi; A.A. Sorour. 2020. "Development of a green corrosion inhibitor for use in acid cleaning of MSF desalination plant." Desalination 495, no. : 114675.

Journal article
Published: 23 April 2020 in Colloids and Surfaces A: Physicochemical and Engineering Aspects
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Corrosion is one of the challenging problems faced by most of the industries. Corrosion inhibitors are required to overcome the corrosion problem in these industries. Although a large number of organic corrosion inhibitors are reported in literature but most of them are toxic and effective at larger concentrations. Therefore there is a need to search eco-friendly corrosion inhibitors which should be effective even at a very lower concentration. In present investigation, eco-friendly corrosion inhibitors, namely, 2- (5-(4-cyanophenyl) -2,4,6,8-tetraoxo-1,2,3,4,6,7,8,9 – octahydropyrido [2,3-d:6,5-d']dipyrimidin-10 (5 H)-yl)-3-(1H-imidazol-4-yl) propanoic acid (CTDP) and 4-(2,4,6,8-tetraoxo-2,3,4,5,6,7,8,9-octahydro-1H-pyrano[2,3-d:6,5-d']dipyrimidin-5-yl)benzonitrile (OPDB) were synthesized and their corrosion inhibitive properties on mild steel (MS) in 15 % HCl solution was studied by using gravimetric, electrochemical and theoretical calculations. The inhibitors CTDP and OPDB exhibited inhibition efficiency of 68.22 and 63.46 %, respectively, even at a very low concentration of 10 ppm whereas 94.01 and 91.11 %, respectively at 80 ppm concentration and 303 K temperature. Electrochemical studies suggested that CTDP and OPDB act as mixed type inhibitor. Adsorption of both inhibitors obeys Langmuir adsorption isotherm model. FESEM and AFM studies suggested the adsorption of CTDP and OPDB on MS surface to reduce the corrosion. Experimental outcomes support the outcomes obtained from DFT and Monte Carlo Simulation (MCS).

ACS Style

Vandana Saraswat; Mahendra Yadav; I.B. Obot. Investigations on eco-friendly corrosion inhibitors for mild steel in acid environment: Electrochemical, DFT and Monte Carlo Simulation approach. Colloids and Surfaces A: Physicochemical and Engineering Aspects 2020, 599, 124881 .

AMA Style

Vandana Saraswat, Mahendra Yadav, I.B. Obot. Investigations on eco-friendly corrosion inhibitors for mild steel in acid environment: Electrochemical, DFT and Monte Carlo Simulation approach. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2020; 599 ():124881.

Chicago/Turabian Style

Vandana Saraswat; Mahendra Yadav; I.B. Obot. 2020. "Investigations on eco-friendly corrosion inhibitors for mild steel in acid environment: Electrochemical, DFT and Monte Carlo Simulation approach." Colloids and Surfaces A: Physicochemical and Engineering Aspects 599, no. : 124881.

Journal article
Published: 01 April 2020 in Materials
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Chitosan/silver nanofluids were prepared using Phoenix dactylifera (DPLE) or Rumex vesicarius (HEL) extracts as the reducing agent, characterized using Fourier-transform infrared spectroscopy (FTIR), ultraviolet–visible (UV-vis), X-ray diffraction (XRD), and transmission electron microscope (TEM). The antimicrobial effect of the nanofluids against Gram positive, Bacillus licheniformis, Staphylococcus haemolyticus, Bacillus cereus, and Micrococcus luteus, and Gram-negative Pseudomonas aeruginosa, Pseudomonas citronellolis, and Escherichia coli bacteria has been studied. The nanoparticles were polydispersed in the chitosan matrix and are highly stable. The zeta potential of the silver nanoparticles in DPLE- and HEL-mediated composites is +46 mV and +56 mV, respectively. The FTIR results reveal that the free carboxylate groups in the plant biomaterial took part in stabilization process. HEL is a stronger reducing agent than DPLE and nanoparticles generated with HEL are smaller (8.0–36 nm) than those produced with DPLE (10–43 nm). DPLE- and HEL-mediated composites effectively inhibit the growth of the studied bacteria but HEL-mediated composite exhibited higher effect. The higher antimicrobial activity of HEL-mediated composite is linked to the smaller nanoparticles. The foregoing results indicate that HEL extract can be used in the green production of potential antimicrobial chitosan/silver nanofluids for biomedical and packaging applications.

ACS Style

Saviour A. Umoren; Moses M. Solomon; Alexis Nzila; Ime B. Obot. Preparation of Silver/Chitosan Nanofluids Using Selected Plant Extracts: Characterization and Antimicrobial Studies against Gram-Positive and Gram-Negative Bacteria. Materials 2020, 13, 1629 .

AMA Style

Saviour A. Umoren, Moses M. Solomon, Alexis Nzila, Ime B. Obot. Preparation of Silver/Chitosan Nanofluids Using Selected Plant Extracts: Characterization and Antimicrobial Studies against Gram-Positive and Gram-Negative Bacteria. Materials. 2020; 13 (7):1629.

Chicago/Turabian Style

Saviour A. Umoren; Moses M. Solomon; Alexis Nzila; Ime B. Obot. 2020. "Preparation of Silver/Chitosan Nanofluids Using Selected Plant Extracts: Characterization and Antimicrobial Studies against Gram-Positive and Gram-Negative Bacteria." Materials 13, no. 7: 1629.

Journal article
Published: 07 March 2020 in Corrosion Science
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Time–evolution study of 2-(2-pyridyl) benzimidazole (2PB) as CO2 corrosion inhibitor for API X60 steel under hydrodynamic conditions in a synthetic brine solution has been undertaken. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) techniques were employed for this study. The results indicate that 2.56 mM of 2PB could provide up to 88.3 % inhibition efficiency after 12 h at 4000 rpm in the synthetic brine solution. The addition of 0.14 mM thiobarbituric acid (TBA) significantly enhances 2PB performance to 95.6 % using PDP. ATR-IR, SEM and optical image characterizations confirm that 2PB adsorption suppresses the localized corrosion of the steel.

ACS Style

Ikenna B. Onyeachu; Ime Bassey Obot; Akeem Y. Adesina. Green corrosion inhibitor for oilfield application II: The time–evolution effect on the sweet corrosion of API X60 steel in synthetic brine and the inhibition performance of 2-(2-pyridyl) benzimidazole under turbulent hydrodynamics. Corrosion Science 2020, 168, 108589 .

AMA Style

Ikenna B. Onyeachu, Ime Bassey Obot, Akeem Y. Adesina. Green corrosion inhibitor for oilfield application II: The time–evolution effect on the sweet corrosion of API X60 steel in synthetic brine and the inhibition performance of 2-(2-pyridyl) benzimidazole under turbulent hydrodynamics. Corrosion Science. 2020; 168 ():108589.

Chicago/Turabian Style

Ikenna B. Onyeachu; Ime Bassey Obot; Akeem Y. Adesina. 2020. "Green corrosion inhibitor for oilfield application II: The time–evolution effect on the sweet corrosion of API X60 steel in synthetic brine and the inhibition performance of 2-(2-pyridyl) benzimidazole under turbulent hydrodynamics." Corrosion Science 168, no. : 108589.

Journal article
Published: 19 February 2020 in Coatings
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Dodecyl pyridinium bromide (DDPB), tetradecyl pyridinium bromide (TDPB) and dodecyl 1,1′-bispyridinium dibromide (DDBPB) were successfully synthesized, characterized and evaluated for HCl pickling of X-60 low carbon steel. Order of corrosion inhibitions efficiencies, as revealed by both electrochemical and gravimetric studies, is TDPB > DDPB > DDBPB. The degree of hydrophilicity of inhibitors as predicted by a partition coefficient (Log P) and supported by a contact angle measurement was found to be responsible for their order of corrosion inhibition efficiencies. Adsorption of DDPB, TDPB, and DDBPB through the pyridinium nitrogen on mild steel surface was confirmed by ATR-FTIR and SEM-EDX analyses. The pyridinium nitrogen was found not to be the only factor responsible for their efficiency, but hydrophobes and the orientation of the hydrophilic ring were responsible, which incline to the deviation of experimental results and the order of Monte Carlo simulation adsorption energies. DDPB, TDPB, and DDBPB obey the Langmuir isotherm model despite major contributions of the film formed on the surface of X-60 mild steel on their overall inhibition corrosion resistance.

ACS Style

Nurudeen A. Odewunmi; Mohammad A. Jafar Mazumder; Shaikh A. Ali; Norah A. Aljeaban; Bader G. Alharbi; Abdulaziz A. Al-Saadi; Ime B. Obot. Impact of Degree of Hydrophilicity of Pyridinium Bromide Derivatives on HCl Pickling of X-60 Mild Steel: Experimental and Theoretical Evaluations. Coatings 2020, 10, 185 .

AMA Style

Nurudeen A. Odewunmi, Mohammad A. Jafar Mazumder, Shaikh A. Ali, Norah A. Aljeaban, Bader G. Alharbi, Abdulaziz A. Al-Saadi, Ime B. Obot. Impact of Degree of Hydrophilicity of Pyridinium Bromide Derivatives on HCl Pickling of X-60 Mild Steel: Experimental and Theoretical Evaluations. Coatings. 2020; 10 (2):185.

Chicago/Turabian Style

Nurudeen A. Odewunmi; Mohammad A. Jafar Mazumder; Shaikh A. Ali; Norah A. Aljeaban; Bader G. Alharbi; Abdulaziz A. Al-Saadi; Ime B. Obot. 2020. "Impact of Degree of Hydrophilicity of Pyridinium Bromide Derivatives on HCl Pickling of X-60 Mild Steel: Experimental and Theoretical Evaluations." Coatings 10, no. 2: 185.

Journal article
Published: 23 January 2020 in The European Physical Journal Plus
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ACS Style

Ikenna B. Onyeachu; Ime Bassey Obot; Aeshah H. Alamri; Chinenye A. Eziukwu; Aeshah Alamri. Effective acid corrosion inhibitors for X60 steel under turbulent flow condition based on benzimidazoles: electrochemical, theoretical, SEM, ATR-IR and XPS investigations. The European Physical Journal Plus 2020, 135, 1 .

AMA Style

Ikenna B. Onyeachu, Ime Bassey Obot, Aeshah H. Alamri, Chinenye A. Eziukwu, Aeshah Alamri. Effective acid corrosion inhibitors for X60 steel under turbulent flow condition based on benzimidazoles: electrochemical, theoretical, SEM, ATR-IR and XPS investigations. The European Physical Journal Plus. 2020; 135 (1):1.

Chicago/Turabian Style

Ikenna B. Onyeachu; Ime Bassey Obot; Aeshah H. Alamri; Chinenye A. Eziukwu; Aeshah Alamri. 2020. "Effective acid corrosion inhibitors for X60 steel under turbulent flow condition based on benzimidazoles: electrochemical, theoretical, SEM, ATR-IR and XPS investigations." The European Physical Journal Plus 135, no. 1: 1.

Journal article
Published: 06 December 2019 in Carbohydrate Polymers
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Seven natural polymers namely, chitosan (CHI), dextran (Dex), carboxymethyl cellulose (CMC), sodium alginate (ALG), pectin (PEC), hydroxylethyl cellulose (HEC), and Gum Arabic (GA) were screened for anticorrosion property towards AZ31 Mg alloy in 3.5 wt.% NaCl solution. CHI, Dex, CMC, PEC, and GA accelerated the corrosion while ALG and HEC moderately inhibited the corrosion of the alloy. HEC and ALG (1 g/L) protected the alloy by 64.13 % and 58.27 %, respectively. Two inhibitor cocktails consisting of either HEC or ALG, KI, and Date palm seed oil have been formulated. HEC- and ALG-formulations inhibited the alloy corrosion by 80.56 % and 77.43 %, respectively from EIS technique. Surface observation studies using SECM, AFM, SEM, and EDX agreed with other experimental results revealing effective corrosion inhibition by the formulations. X-ray photoelectron spectroscopy, FTIR, and UV–vis results disclose that Mg(OH)2 co-existed with adsorbed inhibitor complexes.

ACS Style

Saviour A. Umoren; Moses M. Solomon; A. Madhankumar; Ime B. Obot. Exploration of natural polymers for use as green corrosion inhibitors for AZ31 magnesium alloy in saline environment. Carbohydrate Polymers 2019, 230, 115466 .

AMA Style

Saviour A. Umoren, Moses M. Solomon, A. Madhankumar, Ime B. Obot. Exploration of natural polymers for use as green corrosion inhibitors for AZ31 magnesium alloy in saline environment. Carbohydrate Polymers. 2019; 230 ():115466.

Chicago/Turabian Style

Saviour A. Umoren; Moses M. Solomon; A. Madhankumar; Ime B. Obot. 2019. "Exploration of natural polymers for use as green corrosion inhibitors for AZ31 magnesium alloy in saline environment." Carbohydrate Polymers 230, no. : 115466.

Review article
Published: 06 September 2019 in Journal of Petroleum Science and Engineering
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Sweet corrosion is one of the most often encountered type of corrosion of steel materials in oil and gas production wells and also a major cause of serious corrosion–related material failure in the industry. The use of corrosion inhibitors is one of the most economical methods of controlling sweet corrosion. Corrosion inhibitors applied under bottom-hole temperatures up to 100 °C are usually stable and generally show no technology-related problems in their performance. Above this temperature, however, the literature report of corrosion inhibitors is relatively scarce. This poses a serious challenge to controlling sweet corrosion as drilling operations now drift to deeper wells with higher temperature and pressure. Consequently, no scientific or patent review on corrosion inhibitors for sweet corrosion at high temperature is visible in the literature. Therefore, a thorough review of high-temperature sweet corrosion inhibitors is important. Herein, we review scientific research publications and patents related to corrosion inhibitors reported for sweet corrosion of steel at temperature at least 90 °C. Nitrogen–based compounds are the most widely used inhibitor chemistries. Research gaps still exists on localized and high total dissolved solids (TDS) brine high temperature sweet corrosion inhibitors. Future research directions have also been highlighted.

ACS Style

I.B. Obot; Ikenna B. Onyeachu; Saviour A. Umoren; Mumtaz A. Quraishi; Ahmad A. Sorour; Tao Chen; Norah Aljeaban; Qiwei Wang. High temperature sweet corrosion and inhibition in the oil and gas industry: Progress, challenges and future perspectives. Journal of Petroleum Science and Engineering 2019, 185, 106469 .

AMA Style

I.B. Obot, Ikenna B. Onyeachu, Saviour A. Umoren, Mumtaz A. Quraishi, Ahmad A. Sorour, Tao Chen, Norah Aljeaban, Qiwei Wang. High temperature sweet corrosion and inhibition in the oil and gas industry: Progress, challenges and future perspectives. Journal of Petroleum Science and Engineering. 2019; 185 ():106469.

Chicago/Turabian Style

I.B. Obot; Ikenna B. Onyeachu; Saviour A. Umoren; Mumtaz A. Quraishi; Ahmad A. Sorour; Tao Chen; Norah Aljeaban; Qiwei Wang. 2019. "High temperature sweet corrosion and inhibition in the oil and gas industry: Progress, challenges and future perspectives." Journal of Petroleum Science and Engineering 185, no. : 106469.

Journal article
Published: 01 September 2019 in Journal of Materials Research and Technology
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Mouheddin T. Alhaffar; Saviour A. Umoren; Ime B. Obot; Shaikh A. Ali; Moses M. Solomon. Studies of the anticorrosion property of a newly synthesized Green isoxazolidine for API 5L X60 steel in acid environment. Journal of Materials Research and Technology 2019, 8, 4399 -4416.

AMA Style

Mouheddin T. Alhaffar, Saviour A. Umoren, Ime B. Obot, Shaikh A. Ali, Moses M. Solomon. Studies of the anticorrosion property of a newly synthesized Green isoxazolidine for API 5L X60 steel in acid environment. Journal of Materials Research and Technology. 2019; 8 (5):4399-4416.

Chicago/Turabian Style

Mouheddin T. Alhaffar; Saviour A. Umoren; Ime B. Obot; Shaikh A. Ali; Moses M. Solomon. 2019. "Studies of the anticorrosion property of a newly synthesized Green isoxazolidine for API 5L X60 steel in acid environment." Journal of Materials Research and Technology 8, no. 5: 4399-4416.

Journal article
Published: 30 August 2019 in Desalination
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A new environmentally friendly and cost effective molecule, thiabendazole (TBZ), was evaluated as a potential acid corrosion inhibitor for a typical carbon steel (C1020 grade) used as construction material in MSF desalination plant using electrochemical and (weight loss) immersion techniques. Electrochemical measurements after 1, 4 and 8 h immersion in 1.0 M HCl at 25 °C showed that TBZ is an excellent corrosion inhibitor for C1020 grade steel and its inhibition efficiency reaches ≈90% at 4 mM concentration with no substantial increase at 10 mM. In the presence of iodide ions, TBZ showed improved corrosion inhibition attaining inhibition efficiency of 94.3% with 4 mM concentration after 4 h of testing with no increase in inhibition efficiency after 8 h. However, weight loss measurements indicate that the corrosion inhibition performance of TBZ, and TBZ in combination with KI decreased with immersion time up to 24 h and temperature up to 60 °C. SEM-EDX and ATR-IR spectroscopy confirm that the inhibition process was due to the formation of an adsorbed film that protects the steel surface against corrosive medium. DFT and Monte Carlo simulation results gave further molecular and atomic level insight on mechanism of interaction between the inhibitor and the steel surface.

ACS Style

Aeshah H. Alamri; I.B. Obot. Highly efficient corrosion inhibitor for C1020 carbon steel during acid cleaning in multistage flash (MSF) desalination plant. Desalination 2019, 470, 114100 .

AMA Style

Aeshah H. Alamri, I.B. Obot. Highly efficient corrosion inhibitor for C1020 carbon steel during acid cleaning in multistage flash (MSF) desalination plant. Desalination. 2019; 470 ():114100.

Chicago/Turabian Style

Aeshah H. Alamri; I.B. Obot. 2019. "Highly efficient corrosion inhibitor for C1020 carbon steel during acid cleaning in multistage flash (MSF) desalination plant." Desalination 470, no. : 114100.

Review article
Published: 30 June 2019 in Journal of Industrial and Engineering Chemistry
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Metallic pipelines and gathering tanks play a vital role during oil and gas exploration, production, transmission, and processing. These facilities are usually attacked by corrosion. The use of corrosion inhibitors is one of the most economical and reliable approaches to control the corrosion of oil and gas metallic facilities. This paper looks at the progress made in the development of sour corrosion inhibitors from early 1900 to date. Scientific literatures were reviewed. The review identified four classes of organic corrosion inhibitors for sour environments, namely, amine-based, imidazoline-based, polymer-based, and Gemini-surfactant-based inhibitors. The strengths and weaknesses of these inhibitors were highlighted. The review revealed that the patronage of amine-based chemistries has declined, and the current technology is based on imidazoline and quaternary salt chemistries. The existing knowledge gap and the future research direction in the area of sour corrosion inhibitors development have been highlighted.

ACS Style

I.B. Obot; Moses M. Solomon; Saviour A. Umoren; Rami Suleiman; Mohamed Elanany; Nayef M. Alanazi; Ahmad. A. Sorour. Progress in the development of sour corrosion inhibitors: Past, present, and future perspectives. Journal of Industrial and Engineering Chemistry 2019, 79, 1 -18.

AMA Style

I.B. Obot, Moses M. Solomon, Saviour A. Umoren, Rami Suleiman, Mohamed Elanany, Nayef M. Alanazi, Ahmad. A. Sorour. Progress in the development of sour corrosion inhibitors: Past, present, and future perspectives. Journal of Industrial and Engineering Chemistry. 2019; 79 ():1-18.

Chicago/Turabian Style

I.B. Obot; Moses M. Solomon; Saviour A. Umoren; Rami Suleiman; Mohamed Elanany; Nayef M. Alanazi; Ahmad. A. Sorour. 2019. "Progress in the development of sour corrosion inhibitors: Past, present, and future perspectives." Journal of Industrial and Engineering Chemistry 79, no. : 1-18.