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Acidic Corrosion

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Jorge Uruchurtu – One of the best experts on this subject based on the ideXlab platform.

Eno E. Ebenso – One of the best experts on this subject based on the ideXlab platform.

Deysi Y Cruzgonzalez – One of the best experts on this subject based on the ideXlab platform.

Lei Guo – One of the best experts on this subject based on the ideXlab platform.

  • Phenolic fraction of Ammi visnaga extract as environmentally friendly antioxidant and Corrosion inhibitor for mild steel in Acidic medium
    Journal of Molecular Liquids, 2021
    Co-Authors: S. Aourabi, M. Driouch, M. Sfaira, F. Mahjoubi, Belkheir Hammouti, Chandrabhan Verma, Eno E. Ebenso, Lei Guo
    Abstract:

    Abstract The present study aims to prepare a phenolic extract of Ammi visnaga from its areal part and qualitative measurement of flavonoids and tannins present in the extract using Folin Ciacalteu and Quettier-Deleu methods. Antioxidant activities of different fractions of the extract was measured using DPPH•, FRAP, β-carotene and total antioxidant capacity techniques. The n-butanol and ethyl acetate fractions designated as F3 and F6, respectively. Corrosion inhibition effect of quercetin and catechin and F3 and F6 was studied for mild steel in 1 M HCl using electrochemical procedures. Electrochemical studies showed that quercetin and catechin standards showed antagonistic effect towards mild steel Acidic Corrosion. Among the tested species, the F6 and F3 fractions showed highest efficiencies of 93% and 88%, at 0.15 g L−1 concentration, respectively. Potentiodynamic and electrochemical impedance spectroscopy (EIS) studies showed that tested species act as mixed-type Corrosion inhibitors, respectively. Adsorption of catechin on metallic surface in Acidic medium obeyed the Temkin and El-Awady models.

  • theoretical studies of three triazole derivatives as Corrosion inhibitors for mild steel in Acidic medium
    Corrosion Science, 2014
    Co-Authors: Lei Guo, Shanhong Zhu, Shengtao Zhang
    Abstract:

    Corrosion inhibitive performance of 4-chloro-acetophenone-O-1′-(1′.3′.4′-triazolyl)-metheneoxime (CATM), 4-fluoro-acetophenone-O-1′-(1′.3′.4′-triazolyl)-metheneoxime (FATM), and 3,4-dichloro-acetophenone-O-1’41’.3′.4′-triazolyl)-metheneoxime (DATM) during the Acidic Corrosion of mild steel surface was investigated using density funcfunctional theory (DFT). Quantum chemical parameters such as the highest occupied molecular orbiorbital energy (E-HOMO), the lowest unoccupied molecular orbiorbital energy (E-LUMO), energy gap (Delta E), Mulliken charges, hardness (xi), dipole moment (mu), and the fraction of electrons transferred (Delta N), were calculated. Quantitative structure activity relationship (QSAR) approach has been used, and a composite index of above-mentioned descriptors was performed to characterize the inhibition performance of the studied molecules. Furthermore, Monte Carlo simulation studies were applied to search for the best configurational space of iron/triazole derivative system. (C) 2014 Elsevier Ltd. All rights reserved.

Chandrabhan Verma – One of the best experts on this subject based on the ideXlab platform.

  • Phenolic fraction of Ammi visnaga extract as environmentally friendly antioxidant and Corrosion inhibitor for mild steel in Acidic medium
    Journal of Molecular Liquids, 2021
    Co-Authors: S. Aourabi, M. Driouch, M. Sfaira, F. Mahjoubi, Belkheir Hammouti, Chandrabhan Verma, Eno E. Ebenso, Lei Guo
    Abstract:

    Abstract The present study aims to prepare a phenolic extract of Ammi visnaga from its areal part and qualitative measurement of flavonoids and tannins present in the extract using Folin Ciacalteu and Quettier-Deleu methods. Antioxidant activities of different fractions of the extract was measured using DPPH•, FRAP, β-carotene and total antioxidant capacity techniques. The n-butanol and ethyl acetate fractions designated as F3 and F6, respectively. Corrosion inhibition effect of quercetin and catechin and F3 and F6 was studied for mild steel in 1 M HCl using electrochemical procedures. Electrochemical studies showed that quercetin and catechin standards showed antagonistic effect towards mild steel Acidic Corrosion. Among the tested species, the F6 and F3 fractions showed highest efficiencies of 93% and 88%, at 0.15 g L−1 concentration, respectively. Potentiodynamic and electrochemical impedance spectroscopy (EIS) studies showed that tested species act as mixed-type Corrosion inhibitors, respectively. Adsorption of catechin on metallic surface in Acidic medium obeyed the Temkin and El-Awady models.

  • Synthesis, Characterization, and Corrosion Inhibition Performance of 5-Aminopyrazole Carbonitriles Towards Mild Steel Acidic Corrosion
    Journal of Bio- and Tribo-Corrosion, 2018
    Co-Authors: Ankush Mishra, Chandrabhan Verma, Eno E. Ebenso, Swati Chauhan, M. A. Quraishi, Vandana Srivastava
    Abstract:

    The present study deals with the Corrosion inhibition performance of three 5-aminopyrazole carbonitriles (designated as AHPC, ANPC, and AMPC) on mild steel in 1M HCl medium using gravimetric, electrochemical, surface, and density functional theory (DFT) methods. Gravimetric measurements revealed that inhibition efficiency of the tested compounds increases on increasing their concentration and that AHPC, ANPC, and AMPC showed the highest efficiencies of 90.34%, 92.04%, and 95.45%, respectively, at 7.69 × 10^−4 M concentration. Electrochemical studies suggest that tested inhibitor molecules act as mixed type Corrosion inhibitors and also enhance charge transfer resistance for Corrosion process. Surface morphological studies carried out using SEM and AFM studies revealed that AHPC, ANPC, and AMPC molecules adsorb and form surface protective film. DFT study revealed that AHPC, ANPC, and AMPC molecules showed strong interactions with the metallic surface and adsorb strongly.

  • A Green and Sustainable Approach for Mild Steel Acidic Corrosion Inhibition Using Leaves Extract: Experimental and DFT Studies
    Journal of Bio- and Tribo-Corrosion, 2018
    Co-Authors: Chandrabhan Verma, Eno E. Ebenso, M. A. Quraishi, Indra Bahadur
    Abstract:

    The effect of Holoptelea integrifolia leaf extract (HILE) on corrosive dissolution of mild steel in 1 M hydrochloric acid was investigated using weight loss, surface, electrochemical, and DFT methods. Results showed that Corrosion protection capability of HILE increases with increasing its concentration and maximum value of 93.91% was attained at 400 mg/L concentration. Adsorption of phytochemicals present in HILE on metallic surface followed the Langmuir adsorption isotherm. Tafel polarization study revealed that HILE acts as mixed type inhibitor. EIS study revealed that HILE inhibits mild steel Corrosion by getting adhered on the mild steel surface. SEM and AFM analyses showed that in presence of HILE, metallic surface becomes smooth because of the formation of inhibitive film over metallic surface. DFT calculations were also performed on the several active phytochemicals. It was found that β -amyrin was the most effective phytochemical for mild steel Corrosion among the available constituents present in the extract. Graphical Abstract