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    Corrosion inhibition, surface adsorption and computational studies of Momordica charantia extract: a sustainable and green approach
    (Springer International Publishing Ag, 2021) Haldhar, Rajesh; Prasad, Dwarika; Kamboj, Divya; Kaya, Savas; Dagdag, Omar; Guo, Lei
    The aerial parts extract of Momordica charantia plant were used for the corrosion resistance of carbon steel in the acidic medium (0.5 M H2SO4) utilizing weight loss method, Tafel and Electrochemical Impedance Spectroscopy. The state of mixed inhibitor adsorption on the carbon steel surface is shown by potentiodynamic polarization. M. charantia achieved the extraordinary inhibition efficiency of 93.51% at 500 mg/L of inhibitor concentration. Scanning electron microscopy and atomic force microscopy were used to know about the thin layer which was formed on the surface of carbon steel for its protection from corrosion and the adsorption of inhibitor was shown by UV-vis. spectroscopic technique. Fourier Transform Infrared Spectroscopy technique confirmed the existence of functional groups and the heteroatoms exhibit in the inhibitor. Adsorbance by the inhibitory molecules on the carbon steel surface followed the Langmuir adsorption isotherm. Hypothetical investigations (computational) showed a very valuable report. All acquired outcomes ensure that M. charantia extract can procedure an effectual preventing layer and restrict the corrosion procedure.
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    Corrosion inhibition, surface adsorption and computational studies of Swertia chirata extract: A sustainable and green approach
    (Elsevier Science Sa, 2021) Haldhar, Rajesh; Prasad, Dwarika; Nguyen, Le T. D.; Kaya, Savas; Bahadur, Indra; Dagdag, Omar; Kim, Seong-Cheol
    The aerial parts extracted from Swertia chirata (S. chirata) plant were employed for the corrosion resistance of carbon steel in the acidic medium (0.5 M H2SO4) utilizing by weight-loss method, Tafel and EIS. The state of mixed inhibitor adsorption on the carbon steel surface were shown by potentiodynamic polarization. S. chirata achieved the extraordinary inhibition efficiency of 92.32% at 500 mg/L of inhibitor concentration. SEM and AFM were used to know about the thin layer formed on the surface of carbon steel for its protection from corrosion and the adsorption of inhibitors shown by UV-vis analysis FT-IR technique confirmed the existence of functional groups and the heteroatoms exhibited in the inhibitor. Adsorbance by the inhibitory molecules on the carbon steel surface followed the Langmuir adsorption isotherm. Theoretical investigations (computational) showed a precious report which was supported by experimental results. All acquired outcomes ensure that S. chirata extract can procedure an effectual preventing layer and restrict the corrosion procedure.
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    Investigation of plant waste as a renewable biomass source to develop efficient, economical and eco-friendly corrosion inhibitor
    (Elsevier, 2021) Haldhar, Rajesh; Prasad, Dwarika; Bahadur, Indra; Dagdag, Omar; Kaya, Savas; Verma, Dakeshwar Kumar; Kim, Seong-Cheol
    Various concentration of Solanum surattense (S. surattense) aerial parts extract was utilized for low carbon steel (LCS) in the presence of corrosive medium (0.5 M sulfuric acid) utilizing weight-loss technique and electrochemical methods (Tafel and EIS). The mixed adsorption status on the LCS was exhibited by potentiodynamic polarization. S. surattense accomplished 93% corrosion inhibition effectiveness at an inhibitor concentration of 500 mg/L. SEM and AFM was utilized to distinguish the thin film framed on the outside of the metal alloy to protect it from corrosion. The molecular adhesion of the inhibitor was demonstrated to be Ultraviolet-visible (UV-Vis) spectroscopic method. The FT-IR strategy supported the existence of different functional groups and different atoms other than Carbon and Nitrogen in the protective extract. Thin layer adhesion of the inhibitor molecules outside of LCS metal substrate obeyed the Langmuir adsorption isotherm and acted as mixed type inhibitor. DFT revealed an entirely important report with high EHOMO and low ELUMO values for active phytoconstituents showing potential nature of inhibitor and good agreements with experimental outcomes. The whole acquired results entail that S. surattense creates protective coat hence limit the degree of LCS degradation. (C) 2021 Elsevier B.V. All rights reserved.
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    Natural corrosion inhibitor of renewable eco-waste for SS-410 in sulfuric acid medium: adsorption, electrochemical, and computational studies
    (Elsevier, 2022) Prasad, Dwarika; Singh, Rahul; Kaya, Savas; el Ibrahimi, Brahim
    The petroleum pipeline corrosion is one of the biggest problems faced by oil industries. This investigation shows the corrosion resistance activity for SS-410 (stainless steel using in the petroleum pipeline), by varying the concentration of Piper nigrum leaves (PNL) extract. In this study, the effect of PNL extract for corrosion resistance of stainless steel (SS-410) mostly used in petroleum industries, coupons in 0.5 H2SO4, were analyzed by Potentiodynamic polarization (PDP) and Eletrochemical impedance spectroscopy (EIS) data. A potentiodynamic polarisation study revealed 94.20% inhibition efficiency of the PNL extract, at critical concentrations. Computational studies, using Density functional theory (DFT) and molecular dynamics (MD) simulation, were led as a valuable report for understanding the electronic adsorption, comparative inhibitory activities of phytochemicals. The Infrared (IR), Ultraviolet-visible (UV-vis) spectroscopy, scanning electron microscope (SEM), atomic force microscopy (AFM) and X-Ray Diffraction (XRD) findings indicate that the PNL extract is capable for preventing aggressive media from adhering on SS-410 surfaces. (C) 2022 Elsevier B.V. All rights reserved.
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    Papaver somniferum as an efficient corrosion inhibitor for iron alloy in acidic condition: DFT, MC simulation, LCMS and electrochemical studies
    (Elsevier, 2021) Haldhar, Rajesh; Kim, Seong-Cheol; Prasad, Dwarika; Bedair, M. A.; Bahadur, Indra; Kaya, Savas; Dagdag, Omar
    The corrosion resistance of iron alloy in 0.5 M sulphuric acid was checked in the presence and absence of Papaver somniferum ( P. somniferum ) seed extract. Notably, P. somniferum showed 95% corrosion resistance efficiency at 500 mg/L concentration. The adsorption of this inhibitor follows the Langmuir isotherm indicating its monolayer formation on the surface of iron alloy. The potentiodynamic experiments indicated its nature as mixed type of inhibition behaviour. The SEM and AFM techniques were used to study the protective layer on iron alloy. FT-IR with ATR confirmed various functional groups containing heteroatoms present in phytochemicals and formed complex with iron respectively. Theoretical studies were given as a valuable report to understand the comparative adsorption of phytochemical. All acquired outcomes confirmed that P. somniferum seed extract act as an efficient corrosion inhibitor. (c) 2021 Elsevier B.V. All rights reserved.