Abstract
The effectiveness of two new pyridine derivatives, namely N-(2-hydroxybenzylidene) pyridine-4-amine (HBPA) and N-(5-bromo-2-hydroxybenzylidene) pyridine-4-amine (B-HBPA) as corrosion inhibitors for X70 steel in 2 M HCl solution was examined using weight loss, electrochemical and quantum chemical calculations. The results from the experimental studies indicate that the two pyridine derivatives inhibited X70 steel corrosion in the acid environment with HBPA displaying superiority in the inhibition performance. The inhibition efficiency from the polarization studies gave 96 and 92% for HBPA and B-HBPA, respectively; it also indicated that HBPA and B-HBPA behaved as a mixed-type inhibitor with predominant cathodic effect with HBPA inhibitor. Data from electrochemical impedance gave efficiency of 95 and 94% for HBPA and B-HBPA, respectively, at maximum inhibitor concentrations. The inhibitors adsorption on X70 steel surface obeyed Langmuir adsorption isotherm. The inhibitive effect of the studied inhibitors was confirmed by scanning electron microscopy (SEM) analysis. Quantum chemical calculations studied via density functional theory (DFT) provided additional support for better understanding of the mechanism of corrosion inhibition displayed by the studied pyridine derivatives.
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Acknowledgements
Council of Scientific and Industrial Research (CSIR), India, and The World Academy of Sciences (TWAS), Italy are gratefully acknowledged by Anadebe for the CSIR-TWAS Postgraduate Fellowship Award Nos. 22/FF/CSIR-TWAS/2019 to pursue his Ph.D. research program in CSIR-CECRI, India. In addition, Anadebe, acknowledges Alex Ekwueme Federal University Ndufu-Alike, Ebonyi State, Nigeria, for a research leave to study his Ph.D. in CSIR-CECRI, India.
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Iroha, N.B., Dueke-Eze, C.U., Fasina, T.M. et al. Anticorrosion activity of two new pyridine derivatives in protecting X70 pipeline steel in oil well acidizing fluid: experimental and quantum chemical studies. J IRAN CHEM SOC 19, 2331–2346 (2022). https://doi.org/10.1007/s13738-021-02450-2
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DOI: https://doi.org/10.1007/s13738-021-02450-2