Evaluation of 2-Mercaptobenzimidazole Derivatives as Corrosion Inhibitors for Mild Steel in Hydrochloric Acid

Lgaz, Hassane; Masroor, Sheerin; Chafiq, Maryam; Damej, M.; Brahmia, Ameni; Salghi, R.; Benmessaoud, Mohammed; Ali, Ismat H.; Alghamdi, Majed M.; Chaouiki, Abdelkarim; Chung, Ill‐Min

doi:10.3390/met10030357

Cited by 75 publications

(23 citation statements)

References 42 publications

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“…Benzimidazole derivatives, such as 2-mercaptobenzimidazole (2-MBI), have been widely studied as corrosion inhibitors in solution for various metals and alloys, such as steel 15,16 , aluminum 17 and copper [1][2][3][4][5][6][7][8]11,13,14,[18][19][20] . The molecule may exist in two tautomeric forms, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Molecular scale insights into interaction mechanisms between organic inhibitor film and copper

Wiame

Maurice

et al. 2021

npj Mater Degrad

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A model experimental approach, providing molecular scale insight into the build up mechanisms of a corrosion inhibiting interface, is reported. 2-mercaptobenzimidazole (2-MBI), a widely used organic inhibitor, was deposited from the vapor phase at ultra-low pressure on copper surfaces in chemically-controlled state, and X-ray photoelectron spectroscopy was used in situ to characterize the adsorption mechanisms upon formation of the inhibiting film. On copper surfaces prepared clean in the metallic state, the intact molecules lie flat at low exposure, with sulfur and both nitrogen atoms bonded to copper. A fraction of the molecules decomposes upon adsorption, leaving atomic sulfur on copper. At higher exposure, the molecules adsorb in a tilted position with sulfur and only one nitrogen bonded to copper, leading to a densification of 2-MBI in the monolayer. A bilayer is formed at saturation with the outer layer not bonded directly to copper. In the presence of a pre-adsorbed 2D oxide, oxygen is substituted and the molecules adsorb intactly without decomposition. A 3D oxide prevents the bonding of sulfur to copper. The molecular film formed on metallic and 2D oxide pre-covered surfaces partially desorbs and decomposes at temperature above 400 °C, leading to the adsorption of atomic sulfur on copper.

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Section: Introductionmentioning

confidence: 99%

Molecular scale insights into interaction mechanisms between organic inhibitor film and copper

Wiame

Maurice

et al. 2021

npj Mater Degrad

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“…The Nyquist spectra ( Figure 5 ) exhibit slightly depressed semi-circles at medium to high frequencies and an inductive feature at lower frequencies. The capacitive loop at a higher frequency range suggests that carbon steel’s corrosion is mainly affected by a charge transfer process [ 29 ]. The increase of the diameter is more noticeable as the inhibitor concentration increases, which can be ascribed to the formation of a protective film on the steel surface [ 3 ].…”

Section: Resultsmentioning

confidence: 99%

“…It can be concluded from Table 6 that the R ct values are directly proportional to the inhibitor’s concentrations, and in turn, the values of %IE EIS increase. Values of %IE EIS are obtained from the R ct values of charge transfer resistance data using Equation (8) [ 29 ]:

where R ct and R ct(inh) are the charge-transfer resistance values without and with inhibitors, respectively.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Assessment of Two Malonyl Dihydrazide Derivatives as Corrosion Inhibitors for Carbon Steel in Acidic Media: Experimental and Theoretical Studies

et al. 2021

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Despite the extensive use of carbon steel in all industrial sectors, particularly in the petroleum industry, its low corrosion resistance is an ongoing problem for these industries. In the current work, two malonyl dihydrazide derivatives, namely 2,2’-malonylbis (N-phenylhydrazine-1-carbothiamide (MBC) and N’1, N’3-bis(-2-hydroxybenzylidene) malonohydrazide (HBM), were examined as inhibitors for the carbon steel corrosion in 1.0 M HCl. Both MBC and HBM were characterised using thin-layer chromatography, elemental analysis, infrared spectroscopy, and nuclear magnetic resonance techniques. The corrosion tests were performed using mass loss measurements, polarisation curves, and electrochemical impedance spectroscopy. It is obtained from the mass loss studies that the optimal concentration for both inhibitors is 2.0 × 10−5 mol/L, and the inhibition efficiencies reached up to 90.7% and 84.5% for MBC and HBM, respectively. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarisation (PDP) indicate an increased impedance in the presence of both MBC and HBM and mixed-type inhibitors, respectively. Both inhibitors can mitigate corrosion in the range of 298–328 K. Values of free energy changes obtained from the Langmuir model suggest that the inhibitors suppress the corrosion process principally by chemisorption. The computational investigations were conducted to identify the factors connected with the anti-corrosive properties of the examined inhibitors.

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“…Imperfect capacitance loops may be caused by the heterogeneity of the metal surface and dispersion in frequency. 13 …”

Section: Resultsmentioning

confidence: 99%

Pivotal Role of Heteroatoms in Improving the Corrosion Inhibition Ability of Thiourea Derivatives

et al. 2020

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1,3-Diphenyl-2-thiourea (DPTU) and 1-phenyl-3-(2-pyridyl)-2-thiourea (PPTU) were selected as the researched subject for investigating the effect of heteroatoms on the low carbon steel corrosion inhibition ability. Results from the potentiodynamic polarization measurements (PPM) indicate that the addition of a nitrogen atom in the benzene ring increases the corrosion inhibition efficiency of PPTU (97.2%), being higher than that of DPTU (93.1%) at the same condition of 2.0 × 10 –4 M at 30 °C. The Nyquist diagrams show that increasing the concentrations of both DPTU and PPTU will enhance the charge-transfer resistance and reduce the double-layer capacitance. The obtained data based on PPM and electrochemical impedance spectroscopy methods are in accordance to the analysis based on the scanning electrochemical microscopy images. Besides, results from quantum chemical calculations prove that the heteroatoms in the inhibitor molecules are the adsorption centers, and the benzene rings increase the electrostatic interaction between the inhibitor molecules and the steel surface. Results from Monte Carlo and molecular dynamics simulation have clarified the adsorption mechanism of DPTU and PPTU on the steel surface. Adsorption energies confirm that PPTU displays the higher inhibition ability as compared with DPTU.

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Evaluation of 2-Mercaptobenzimidazole Derivatives as Corrosion Inhibitors for Mild Steel in Hydrochloric Acid

Cited by 75 publications

References 42 publications

Molecular scale insights into interaction mechanisms between organic inhibitor film and copper

Molecular scale insights into interaction mechanisms between organic inhibitor film and copper

Synthesis and Assessment of Two Malonyl Dihydrazide Derivatives as Corrosion Inhibitors for Carbon Steel in Acidic Media: Experimental and Theoretical Studies

Pivotal Role of Heteroatoms in Improving the Corrosion Inhibition Ability of Thiourea Derivatives

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