Browsing by Author "Shetty, N.A."

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    Exploring the Corrosion Inhibition Properties of an Anionic Gemini Surfactant Based on an Ethylenediaminetetraacetic Acid Derivative on AZ31 Alloy
    (John Wiley and Sons Inc, 2021) Acharya, G.M.; Shetty, N.A.
    Novel sodium 2,2?-(7,16-dihexyl-8,15-dioxo-7,10,13,16-tetraazadocosane-10,13-diyl)diacetate was prepared by treating ethylenediaminetetraacetic acid dianhydride with N-dihexylamine. The surfactant was used as a corrosion inhibitor on AZ31 alloy. FT-IR spectroscopy, NMR spectroscopy and LC-MS techniques were used to characterize the synthesized anionic inhibitor. The theoretical studies, performed by using the DFT simulations revealed in-depth information on the frontier molecular orbitals and electronic properties of the inhibitor. Potentiodynamic polarization and electrochemical impedance spectroscopy methods were used to determine the corrosion inhibition ability of the synthesized surfactant. The adsorption of the surfactant on the surface of AZ31 Mg alloy obeyed Langmuir isotherm with predominantly physical adsorption and partial chemisorption. SEM-EDX and XPS were used to understand the surface morphologies of the corroded AZ31 alloy. The quantum chemical simulations were used to get the correlation between their structural, molecular geometry, and experimental results. © 2021 Wiley-VCH GmbH
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    Pyrazoline Derivative as Corrosion Inhibitor for Mild Steel in Hydrochloric Acid Medium: Experimental and Theoretical Approach
    (John Wiley and Sons Inc, 2023) Shekara, P.; Kudva, J.; Sadashiva, R.; Naral, D.; D’Souza, P.R.; Shetty, N.A.
    A new pyrazoline derivative, 1-[5-(4-bromophenyl)-3-(6-methoxypyridine-3-yl)-4-5-dihydro-1H-pyrazol-1-yl]-ethane-1-one (BMDP) was synthesised using chalcone derivative. The FTIR, 1HNMR, and mass spectral analysis were performed to validate the synthesised compound. The electrochemical impedance spectroscopy and potentiodynamic polarization techniques were performed to evaluate BMDP as a corrosion inhibitor for mild steel. The corrosion inhibition was observed to rise with an increase in BMDP concentration and decline with an increase in temperature. The maximum inhibition efficiency of 91.1 % was reported at 303 K in 40 ppm of BMDP concentration. Activation and adsorption parameters were found with statistical thermodynamic calculations. The surface investigation of the metal surface was performed by SEM, AFM and EDX techniques. UV-visible spectroscopy was used to realise the inhibitor-metal complex formation. The quantum chemical computations were performed by density functional theory using Gaussian 16 software, and the theoretical calculations confirm the outstanding anticorrosive property of BMDP at the diminutive level as analysed in electrochemical studies. © 2023 Wiley-VCH GmbH.