Corrosion inhibition, adsorption and thermodynamic properties of 2-aminopyridine derivatives on the corrosion of carbon steel in sulfuric acid solution

• Published in: Journal of chemical sciences (Bangalore, India) India), 2021-12, Vol.133 (4), Article 109
• Main Authors: Attar, Tarik, Nouali, Fatiha, Kibou, Zahira, Benchadli, Abbes, Messaoudi, Boulanouar, Choukchou-Braham, Esma, Choukchou-Braham, Noureddine
• Format: Article
• Language: English
• Subjects: Adsorption; Carbon steel; Carbon steels; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Corrosion; Density functional theory; Mathematical analysis; Quantum chemistry; Regular Article; Scanning electron microscopy; Sulfuric acid; Surface analysis (chemical); Surface chemistry; Synthesis; Thermodynamic properties; Weight loss measurement
• ISSN: 0974-3626; 0973-7103
• DOI: 10.1007/s12039-021-01971-w

Corrosion inhibition of carbon steel in sulfuric acid solution was performed by three synthesized products named 2-(butylamino)-4-phenylnicotinonitrile (BAPN), 2-(propylamino)-4-phenylnicotinonitrile, and 2-(methylamino)-4-phenylnicotinonitrile using weight-loss method and scanning electron microscopy (SEM). The temperature impact on the inhibition mechanism of the synthesized inhibitors of the carbon steel surface was investigated at various temperatures (20–50 °C) where the inhibitive efficiency diminished with increasing temperatures. The maximum IE of 97.45% was achieved at a temperature of 20 °C, the concentration of BAPN inhibitor of 5×10 -4 M, and H 2 SO 4 acid concentration of 0.5 M. The adsorption of inhibitors studied onto the carbon steel surface obeys the Langmuir adsorption isotherm. The SEM surface analysis showed the formation of a protective organic film on the steel surface. The quantum chemical calculations (DFT) supported the experimental results and showed that the inhibition efficiency also depends on the structure of the inhibitor. Graphic abstract Three inhibitors products based 2-Aminopyridine derivatives was studied on carbon steel in 0.5 M H2SO4 solution. Results of weight loss measurements and scanning electron microscopy image analyses are reported. In addition, quantum chemical calculations using density functional theory (DFT) were performed to estimate theoretically the reactivity parameters of the inhibitor.