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    Aminoantipyrine derivatives as a novel eco-friendly corrosion inhibitors for P110 steel in simulating acidizing environment: Experimental and computational studies
    (Elsevier Sci Ltd, 2020) Singh, Ambrish; Ansari, K. R.; Quraishi, M. A.; Kaya, Savas; Guo, Lei
    The present paper deals with the synthesis and corrosion inhibition evaluation of aminoantipyrine (AAPs) derivatives on P110 steel in 15% hydrochloric acid solution using standard techniques such as weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP). The predicted toxicity (LD50) values are 1482 mg/kg (AAP-1) and 1380 mg/kg (AAP-2). AAPs are effective corrosion inhibitors giving inhibition efficiency of 95% (AAP-1) at only 400 mg/L concentration. Adsorption of AAPs on the P110 steel surface involves both physical and chemical interactions. The EIS results suggest an increased value of charge transfer resistance with increasing AAPs concentration. PDP result reveals that AAP's are mixed type inhibitors with anodic predominance. SEM, AFM, contact angle and XPS spectra, confirmed the presence of adsorbed inhibitor film. DFT study confirms the participation of both neutral and protonated forms in the corrosion inhibition process. The interaction of AAPs with P110 steel was analyzed by MD simulation that includes the calculation of adsorption energy, RDF, diffusion coefficients, and fractional free volume.
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    Anti -corrosion investigation of pyrimidine derivatives as green and sustainable corrosion inhibitor for N80 steel in highly corrosive environment: Experimental and AFM/XPS study
    (Elsevier, 2020) Singh, Ambrish; Ansari, K. R.; Chauhan, Dheeraj Singh; Quraishi, M. A.; Kaya, Savas
    Chromeno pyrimidine (CPs) derivatives were synthesized using green approach that involves reaction of multicomponent in one pot using water as solvent. The CPs molecules were tested as potential corrosion inhibitor for N80 steel in 15% hydrochloric acid solution using standard techniques such as weight loss (WT), electro- chemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP). CPs are effective corrosion inhibitors giving inhibition efficiency of 96.4% at only 200 mg/L concentration (CP-1). Adsorption of CPs with metal surface involve both physical and chemical interactions. EIS results depicted an increase in charge transfer resistance with increase in concentration of CPs. PDP study suggests mixed mode of CPs inhibition action. The adsorbed inhibitor film was confirmed by AFM and XPS spectra.
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    The effect of an N- heterocyclic compound on corrosion inhibition of J55 steel in sweet corrosive medium
    (ROYAL SOC CHEMISTRY, 2019) Singh, Ambrish; Ansari, K. R.; Quraishi, M. A.; Kaya, Savas; Banerjee, Priyabrata
    The corrosion inhibition behavior of a naphthoxazinone derivative 1-phenyl-1,2-dihydronaphtho[1,2-e][1,3]oxazin-3-one (PNO) on J55 steel in 3.5 wt% NaCl solution saturated with carbon dioxide was evaluated using weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The surface morphology on the metal sample was analyzed using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The adsorption of PNO obeyed the Langmuir isotherm. The results of potentiodynamic polarization indicated that the PNO molecule behaved as a mixed type inhibitor by reducing both the anodic and the cathodic electrochemical reactions. The surface analysis showed that the metal surface is considerably smoother and with more uniform morphology in the presence of the inhibitor. DFT based quantum chemical calculations and molecular dynamic (MD) simulations supported the experimentally obtained results.
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    Theoretically and experimentally exploring the corrosion inhibition of N80 steel by pyrazol derivatives in simulated acidizing environment
    (Elsevier, 2020) Singh, Ambrish; Ansari, K. R.; Quraishi, M. A.; Kaya, Savas
    Acidizing is the important process used in petroleum industry for oil well stimulation. Here, we are exploring the green synthesis of 4,4'-((4-methoxyphenyl)methylene)bis(3-methyl-1-phenyl-1H-pyrazol-5-ol) (PZ-1) and 4,4'-((4-nitrophenyl)methylene)bis(3-methyl-1-phenyl-1H-pyrazol-5-ol) (PZ-2) under ultrasonic irradiation and its potential application for N80 steel corrosion mitigation in 15% HCl. The corrosion inhibition investigation was performed by open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), linear polarization (LPR), potentiodynamic polarization (PDP), electrochemical frequency modulation (EFM), and electrochemical frequency modulation trend (EFMT), weight loss, scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), density functional theory (DFT) and molecular dynamics (MD). The EIS and PDP results suggests an increased impedance in presence of PZs and mixed nature of inhibitor action respectively. The protection efficiency (eta%) are 98.4% (PZ-1) and 94.3% (PZ-2). The results of EFMT provides the average decrease in corrosion rate and corrosion current density (i(corr)).The surface analysis suggests a protective layer of PZs. DFT analysis reveals that PZ-1 with lower value of Delta E acts as a better inhibitor compared to PZ-2. MD study supports a stronger binding and interaction ability of PZ-1 than PZ-2. (C) 2020 Elsevier B.V. All rights reserved.
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    Tobacco extracted from the discarded cigarettes as an inhibitor of copper and zinc corrosion in an ASTM standard D1141-98(2013) artificial seawater solution
    (Elsevier, 2020) Singh, Ambrish; Dayu, Xia; Ituen, Ekemini; Ansari, Kashif; Quraishi, M. A.; Kaya, Savas; Lin, Yuanhua
    (C) 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC -ND license (http://creativecomrnons.org/licenses/by-nc-nd/4.0/). The ability of tobacco extracted from discarded cigarettes (NDC) to mitigate the corrosion of copper and zinc in artificial seawater was investigated using electrochemical, weight loss, and surface characterization methods. The PDP results revealed that NDC acts as a mixed type inhibitor with cathodic predominance. EIS measurements suggest that the increase in charge transfer resistance with increasing NDC concentration with maximum inhibition efficiency of 96.8% (copper) and 98.2% (zinc). Langmuir adsorption isotherm was found to be the best fit. A G ads reveals the mixed nature of adsorption. EFMT suggest the lower current density in presence of NDC. SECM, SEM and AFM analysis reveals the NDC film formation. UV-vis spectroscopy suggest the inhibitor/metal complex formation.