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Akpan E, Oladipo SD, Quadri TW, Olasunkanmi LO, Nwanna EE, Omondi B, Ebenso EE. Formamidine-Based Thiuram Disulfides as Efficient Inhibitors of Acid Corrosion of Mild Steel: Electrochemical, Surface, and Density Functional Theory/Monte Carlo Simulation Studies. ACS OMEGA 2022; 7:26076-26091. [PMID: 35936469 PMCID: PMC9352172 DOI: 10.1021/acsomega.2c00985] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 07/08/2022] [Indexed: 05/09/2023]
Abstract
Electrochemical, surface, and density functional theory (DFT)/Monte Carlo (MC) simulation studies were used in investigating the characteristics of N,N'-(disulfanne-1,2-dicarbonothioyl)bis(N,N'-bis(2,6-dimethylphenyl)formimidamide) (DS1), N,N'-(disulfanne-1,2-dicarbonothioyl)bis(N,N'-bis(2,6-diisopropylphenyl)formimidamide) (DS2), N,N'-(disulfanne-1,2-dicarbonothioyl)bis(N,N'-dimesitylformimidamide) (DS3), and N,N'-(disulfanne-1,2-dicarbonothioyl)bis(N,N'-bis(2,6-dichlorophenyl)formimidamide) (DS4) as inhibitors of acid corrosion of mild steel. The inhibitors were found to effectively reduce the rates of steel dissolution at the anode as well as cathodic hydrogen evolution. The order of inhibition efficiencies of studied compounds is DS1 (PDP/LPR/EIS: 98.60/97.98/96.94%) > DS2 (PDP/LPR/EIS: 98.36/96.86/96.90%) > DS3 (PDP/LPR/EIS: 94.66/87.44/94.30%) > DS4 (PDP/LPR/EIS: 83.57/77.02/75.17%) at 1.00 mM, and the overall efficiencies appeared to depend on the molecular and electronic structures of the compounds. The compounds offered high resistance to charge transfer across the electrode/electrolyte system by forming adsorbed film whose resistance increased with an increase in concentration. Findings suggested that the adsorption process involved combined chemisorption and physisorption. DFT calculations and MC simulations provided theoretical justifications for the experimental results.
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Affiliation(s)
- Ekemini
D. Akpan
- College
of Science, Engineering and Technology University of South Africa, Johannesburg 1710, South Africa
| | - Segun D. Oladipo
- School
of Chemistry and Physics, University of
Kwazulu-Natal, Westville Campus, Private Bag X54001, Durban 4000, South Africa
- Department
of Chemical Sciences, Olabisi Onabanjo University, P.M.B. 2002, Ago-Iwoye 120107, Nigeria
| | - Taiwo W. Quadri
- Department
of Chemistry, School of Physical and Chemical Sciences, Faculty of
Natural and Agricultural Sciences, North-West
University (Mafikeng Campus), Private Bag X2046, Mmabatho 2735, South Africa
| | - Lukman O. Olasunkanmi
- Department
of Chemistry, Faculty of Science, Obafemi
Awolowo University, Ile-Ife 220005, Nigeria
- Department
of Chemical Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein Campus, Johannesburg 2028, South Africa
| | - Esther E. Nwanna
- Department
of Biochemistry, Federal University of Technology, P.M.B 704, Akure 340110, Nigeria
| | - Bernard Omondi
- School
of Chemistry and Physics, University of
Kwazulu-Natal, Pietermaritzburg Campus, Private Bag X01, Scottsville 3209, South
Africa
| | - Eno E. Ebenso
- College
of Science, Engineering and Technology University of South Africa, Johannesburg 1710, South Africa
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Idir B, Kellou-Kerkouche F. Experimental and Theoretical Studies on Corrosion Inhibition Performance of Phenanthroline for Cast Iron in Acid Solution. J ELECTROCHEM SCI TE 2018. [DOI: 10.33961/jecst.2018.9.4.260] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Abstract
A method was developed to extract double layer capacitance (C(dl)) from data displaying time constant dispersion at a frequency where the phase angle reached its maximum (f1). This method was implemented in a set of synthetic data and the Kramers-Kronig (K-K) transformable experimental data for mild steel in an acidic solution. The double layer capacitance values were compared with ones extracted from the constant phase element (CPE) parameters, Y(o) and α, at a frequency where the imaginary part of the impedance reached its maximum (f2). A significant closeness of the results was reached for two different frequencies.
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Affiliation(s)
- Muzaffer Özcan
- Department of Science and Technology Education, Çukurova University, 01330 Adana, Turkey.
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Pawelec W, Holappa A, Tirri T, Aubert M, Hoppe H, Pfaendner R, Wilén CE. Disulfides – Effective radical generators for flame retardancy of polypropylene. Polym Degrad Stab 2014. [DOI: 10.1016/j.polymdegradstab.2014.09.013] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Yan X, Zou C, Qin Y. A new sight of water-soluble polyacrylamide modified by β-cyclodextrin as corrosion inhibitor for X70 steel. STARCH-STARKE 2014. [DOI: 10.1002/star.201400063] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Xueling Yan
- College of Chemistry and Chemical Engineering; Southwest Petroleum University; Chengdu P. R. China
| | - Changjun Zou
- College of Chemistry and Chemical Engineering; Southwest Petroleum University; Chengdu P. R. China
| | - Yibie Qin
- College of Chemistry and Chemical Engineering; Southwest Petroleum University; Chengdu P. R. China
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