An Investigation of a Combined Thiourea and Hexamethylenetetramine as Inhibitors for Corrosion of N80 in 15% HCl Solution: Electrochemical Experiments and Quantum Chemical Calculation

Hu, Jun; Wang, Yun; Yu, Liang; Zou, Yunling; Wang, Yuqi

doi:10.1155/2015/548031

Cited by 11 publications

(9 citation statements)

References 54 publications

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“…Mulliken charge distributions analysis is widely used for the prediction of the adsorption center of inhibitors. The data in Table S1 manifests that the most negative atomic charges happen to the N or O atomic for the three molecules, indicating adsorption centers being N and O atoms [27,28]. According to the frontier molecular orbital theory, the formation of a transition state occurs due to interactions between the frontiers orbitals (HOMO and LUMO) of the reactants [29].…”

Section: Resultsmentioning

confidence: 98%

Chemical Combination of 4-(4-Hydroxybut-2-ynyl) Pyridine and 3-Methylbenzenamine to Construct an Effective Inhibitor: Theoretical and Practical Investigation

2018

IJNN

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A new inhibitor, N-m-benzylamine-4-(4-hydroxybut-2-ynyl) pyridinium bromide (designated as BAP) was designed and synthesized. Quantum chemical calculation and molecular dynamics (MD) simulations manifested that BAP, a compound by covalent combination of 4-(4-hydroxybut-2-ynyl) pyridine (HYP) and 3-methyl benzenamine (MBA), functioned better than did the two moieties (HYP and MBA) for X70 steel corrosion inhibition. The corrosion inhibition investigation revealed that the experiment outcome was in good consistency with the theoretical calculation. The inhibition efficiency of BAP was 95.72% for X70 steel in 5 M HCl at 90 0C. BAP adsorbed on X70 steel surface, obeyed Langmuir isotherm, retarded both the metal dissolution and the hydrogen evolution, and enhanced greatly the acid corrosion resistance of X70 steel. Comparative test demonstrated that the inhibition efficiency of BAP was about 10 times of that for MAB and 8 times of that for HYP albeit the concentration of BAP was tenth of that of HYP and MBA. The experimental investigation backs up the theoretical calculation and manifests intramolecular synergism of the structure moieties being beneficial to design of high effective inhibitors.

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Section: Resultsmentioning

confidence: 98%

Chemical Combination of 4-(4-Hydroxybut-2-ynyl) Pyridine and 3-Methylbenzenamine to Construct an Effective Inhibitor: Theoretical and Practical Investigation

2018

IJNN

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“…This result was supported by the modulus plot in Figure 11c, in which the absolute impedance of the The Bode plot (Figure 11b) illustrates that the phase angle of the blank system was in the range of 35 • to 38 • with the resistive behavior, while that of the cysteine-inhibited system was in the range of 50 • to 52 • , reflecting the capacitive behavior. The increase in the phase angle suggested that cysteine forms a passive film on the metal surface, hindering the interaction with corrosive species [31]. The change in rotational speed from static to dynamic conditions did not cause much variation in the phase angle.…”

Section: Effect Of Flow Conditionmentioning

confidence: 92%

“…Furthermore, the inhibitor film reduced the Q f from 1234.50 ± 14.50 µF/cm 2 in the blank system to 312.21 ± 16.24 µF/cm 2 in the 500 ppm cysteine system. This may have resulted from the thickening of an inhibitor film and the effective integration with the double layer [31].…”

Section: Effect Of Cysteine Concentrationmentioning

confidence: 99%

Cysteine as an Alternative Eco-Friendly Corrosion Inhibitor for Absorption-Based Carbon Capture Plants

Habibullah

Veawab

2023

Materials

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Inorganic corrosion inhibitors are commonly applied to mitigate severe corrosion in absorption-based carbon capture plants. They are, however, not environmentally friendly, posing a health risk, harming the environment, and making chemical handling and disposal costly. Therefore, this study evaluated the corrosion inhibition performance of an amino acid, namely cysteine, with the aim of providing an eco-friendly alternative to the commercial inorganic corrosion inhibitors. Electrochemical and weight loss corrosion measurements showed that cysteine was effective in protecting carbon steel at all process operating conditions. At 80 °C, a 500 ppm cysteine could provide up to 83% and 99% inhibition efficiency under static and dynamic flow conditions, respectively. Its inhibition efficiency could be improved when the cysteine concentration, solution temperature, and flow condition were altered. Cysteine was an anodic corrosion inhibitor and underwent spontaneous, endothermic, and combined physical and chemical adsorption that followed the Langmuir adsorption isotherm model. The quantum chemical analysis indicated that cysteine had a high reactivity with metal surfaces due to its low energy gap and high dipole moment. The EDX analysis revealed a significant sulphur content on the metal substrate, indicating that cysteine’s mercapto group played an integral role in forming an effective adsorption layer on the metal interface.

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“…All specimens were manually polished by metallographic emery papers with a grit size from 400 to 800, 1000, and 1200. Afterward, they were immersed in petroleum ether for 10 min, washed thoroughly with distilled water, degreased with acetone, washed again with bidistilled water, and ultimately dried at room temperature [19].…”

Section: Methodsmentioning

confidence: 99%

Corrosion Protection of N80 Steel in Hydrochloric Acid Medium Using Mixed C15H15NO and Na2WO4 Inhibitors

Wang

et al. 2018

Coatings

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A novel inhibitor based on mixed Mannich base (C15H15NO) and Na2WO4 was developed for the corrosion prevention of N80 steel in hydrochloric acid solution. Infra-red spectrum, electrochemical measurements, X-ray Photoelectron Spectroscopy, and Scanning Electron Microscopy were used to understand the inhibition efficiency and mechanism. The results showed that the mixed inhibitors reduced the corrosion current density and increased the interface resistance. The inhibition efficiency is the highest when the ratio of C15H15NO to Na2WO4 is 1:1 in the mixture. Observed from the surfaces, the number of pits and small cracks was reduced on the surface in the presence of the optimized inhibitors. The inhibition film can successfully hinder the chloride ions from reaching the bulk steel.

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An Investigation of a Combined Thiourea and Hexamethylenetetramine as Inhibitors for Corrosion of N80 in 15% HCl Solution: Electrochemical Experiments and Quantum Chemical Calculation

Cited by 11 publications

References 54 publications

Chemical Combination of 4-(4-Hydroxybut-2-ynyl) Pyridine and 3-Methylbenzenamine to Construct an Effective Inhibitor: Theoretical and Practical Investigation

Chemical Combination of 4-(4-Hydroxybut-2-ynyl) Pyridine and 3-Methylbenzenamine to Construct an Effective Inhibitor: Theoretical and Practical Investigation

Cysteine as an Alternative Eco-Friendly Corrosion Inhibitor for Absorption-Based Carbon Capture Plants

Corrosion Protection of N80 Steel in Hydrochloric Acid Medium Using Mixed C15H15NO and Na2WO4 Inhibitors

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