TY - JOUR ID - 255013 TI - A Cyanopyran Derivative for Preventing Corrosion of Pipeline Material Used in The Oil and Gas Industry JO - Analytical and Bioanalytical Electrochemistry JA - ABEC LA - en SN - - AU - Saranya, J. AU - Anusuya, N. AU - Benhiba, F. AU - Warad, I. AU - Zarrouk, Abdelkader M AD - Department of Humanities and Sciences, Gokaraju Rangaraju Institute of Engineering and Technology, Hyderabad, Telangana, India AD - Department of Chemistry, PSGR Krishnammal College for Women, Coimbatore, TamilNadu, India AD - Laboratory of Materials, Nanotechnology, and Environment, Faculty of Sciences, Mohammed V University in Rabat, Av. Ibn Battouta, P.O. Box. 1014 Agdal-Rabat, Morocco AD - Department of Chemistry, AN-Najah National University, P.O. Box 7, Nablus, Palestine Y1 - 2022 PY - 2022 VL - 14 IS - 9 SP - 818 EP - 836 KW - Oil and Gas KW - Mild steel corrosion KW - Potentiodynamic polarization KW - Langmuir KW - SEM/EDS KW - DFT DO - N2 - The present work deals with the corrosion inhibition mechanism of mild steel in 1 M H2SO4 employing the new carbonitrile derivative viz. 2-amino-4-(4-hydroxyphenyl)-6-(p-tolyl)-4H-pyran-3-carbonitrile (HCN). A such mechanism was elicited by means of the potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques and weight loss (WL). The experimental results revealed maximal inhibition efficiency (IE) rates up to 92.4% in weight loss. WL measurement revealed a decrease in corrosion rate with increasing concentration of corrosion inhibitor and decreasing with increasing temperature up to 333 K. The Nyquist curves indicated that the corrosion inhibition was controlled by a charge transfer process whereas the PDP curves showed that the HCN behaved as a mixed-type corrosion inhibitor. The Langmuir isotherm was used to determine the adsorption thermodynamic parameters. Thermodynamic characteristics for activation and adsorption were determined and discussed. Adsorption free energy at 303 K ( = -22.26 kJ mol-1 for HCN) indicated a combination of chemisorption and physisorption. The inhibitor (HCN) formed a protective layer that acted as a barrier between the surface of the metal and the acid medium which was investigated through surface studies like Scanning Electron Microscopy (SEM) coupled with Energy dispersive X-ray analysis (EDS).  The surface studies were in coincidence with weight loss and electrochemical studies. Density functional theory (DFT) was performed to support the experimental data in an aqueous medium using the basis set 6-311G(d,p). From the Mulliken population analysis, the adsorption sites have been studied and the results of DFT were steady with the experimental studies.  UR - https://www.abechem.com/article_255013.html L1 - https://www.abechem.com/article_255013_882890ad3cfa85cbdce0d64cb6a12fd7.pdf ER -