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New Synthesized Nicotinonitrile Derivatives as Effective Corrosion Inhibitors for Carbon Steel in Acidic Environment: Electrochemical, Surface Analysis, and Quantum Methods

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2-((2-Aminophenyl)thio)-4,6-dimethylnicotinonitrile (APTDN) and 4,6-dimethyl-2-(phenylamino) nicotinonitrile (DPAN) as new organic derivatives were investigated as corrosion inhibitors for C-steel in 1 M HCl at various temperatures (25–45 °C) using chemical and electrochemical methods. The adsorption of inhibitors on the C-steel surface fits to Langmuir adsorption isotherm and polarization curves showed that APTDN and DPAN are mixed corrosion inhibitors. The topography maps of atomic force microscopy, X-ray photoelectron spectroscopy, and Attenuated total refraction infrared were performed for examination of C-steel surface. Moreover, quantum chemical calculations using Density functional theory were carried out to correlate between theoretical and experimental data.

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Fouda, A.S., El-Askalany, A.H., Melouk, A.F. et al. New Synthesized Nicotinonitrile Derivatives as Effective Corrosion Inhibitors for Carbon Steel in Acidic Environment: Electrochemical, Surface Analysis, and Quantum Methods. J Bio Tribo Corros 6, 34 (2020). https://doi.org/10.1007/s40735-020-0329-2

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  • C-steel
  • HCl
  • Corrosion inhibition
  • ATR-IR
  • XPS
  • AFM