Corrosion behaviors of Q235 carbon steel under imidazoline derivatives as corrosion inhibitors: Experimental and computational investigations

Abstract

In this work, two new imidazoline derivatives were successfully synthesized, and the molecular structure of which has been proved by IR, Raman and elemental analysis. The corrosion inhibition performance of the imidazoline derivatives for carbon steel in 3.5 wt% sodium chloride simulation-concrete-pore solution was investigated. The weight loss and electrochemical test results exhibited that compared to the blank systems, the corrosion inhibition efficiency was effectively enhanced with increasing the concentrations of two imidazoline derivatives, the maximum corrosion inhibition efficiency of weight-loss test is 96.02%. The inhibition efficiency of Electrochemical impedance spectroscopy and Potentiodynamic polarization were 95.95% and 90.69%. EDS analysis confirmed that two new imidazoline derivatives could effectively adsorb on the Q235 steel surface, which was further supported by density functional theory (DFT) and molecular dynamics simulations. This work confirmed that two new imidazoline derivatives exhibited a potential application in engineering and equipment.

Keywords

• Imidazoline derivatives
• Weight loss
• Electrochemical experiments
• Theoretical calculation