Theoretical and Experimental Studies of 1-Dodecyl-3-phenylquinoxalin-2(1H)-one as a Sustainable Corrosion Inhibitor for Carbon Steel in Acidic Electrolyte

The anti-corrosion features of 1-dodecyl-3-phenylquinoxalin-2(1H)-one (QO12) for carbon steel CS were evaluated in a 1 M HCl solution using potentiodynamic polarization (PDP), electrochemical impedance (EIS) and UV-visible spectroscopy, and scanning electron microscopy (SEM), as well as quantum-chemical methods. The inhibition performance achieves a maximum of 95.33% at 0.001 M. The PDP study revealed that QO12 acts with the character of a mixed-type inhibitor. The EISs mention that the process of corrosion for CS is essentially predominated by the transfer-of-charge mechanism. Moreover, quinoxalinone adsorption follows the Langmuir adsorption isotherm. SEM snapshots show no deterioration after the contribution of QO12 compared to the reference electrolyte. Theoretical calculations suggest that the envisaged inhibitor presents a perfect arrangement capacity through the structure of quinoxalinone.

Automated summary

In this study, the anti-corrosion performance of 1-dodecyl-3-phenylquinoxalin-2(1H)-one (QO12) for carbon steel (CS) was evaluated using various techniques. The results showed that QO12 achieved a maximum inhibition performance of 95.33% at a concentration of 0.001 M. The study revealed that QO12 acted as a mixed-type inhibitor and the corrosion process of CS was dominated by a transfer-of-charge mechanism. The adsorption of quinoxalinone followed the Langmuir adsorption isotherm. SEM analysis showed no corrosion deterioration after the addition of QO12.