Corrosion inhibition properties of perimidin-10-one derivatives for steel reinforcement in acidic environments: Experimental and theoretical insights

Perimidin-10-one derivatives are environmentally benign corrosion inhibitors that prevent steel reinforcement from corroding in acidic environments. The inhibitory impact of 8-(2-Hydroxybenzoyl)-7 H-9-(3-methylphenylhydrazono)-pyrrolo[1,2-a] perimidin-10-one and 8-(2-Hydroxybenzoyl)-7 H-9-phenylhydrazono-pyrrolo[1,2-a] perimidin-10-one on steel-reinforced corrosion in an acidic media (2 M HCl) were explored using chemical technique, (TP) Tafel polarization, (EIS) electrochemical impedance spectroscopy, and (EFM) electrochemical frequency modulation method, as well as theoretical research (quantum chemistry analysis and molecular dynamic studies). Also Energy dispersive X-ray and scanning electron microscopy (EDX–SEM) were used to examine the morphology of shielded steel-reinforced concrete. The inhibition efficiency of the inhibitors with increasing inhibitor concentration and reaches a maximum of 89.68 percent at a concentration of 11×10−6 M at 55° C, according to the findings. The examination of potentiodynamic polarization revealed that the two compounds act as a mixed category of inhibitor. The Langmuir and Henry adsorption isotherms were followed by inhibitors adsorption on steel reinforcement surface. Quantum chemical calculations based on density functional theory (DFT) were used to investigate the manner of adsorption of the two compounds on reinforced surface. Molecular dynamic studies were used to determine the adsorption energy of the inhibitors at different temperatures. Also the comparison between the experimental parts was applied. The results clearly show that the two compounds work well as corrosion inhibitors for steel reinforcement in an acidic media. Compound (1) > compound (2) are the percent IE orders of Perimidin-10-one derivatives. [Display omitted] •In 2M HCl solution, the corrosion inhibition of concrete steel reinforcement was investigated.•Theoretical and electrochemical approaches were employed.•The data collected suit Langmuir and Henry adsorption isotherms rather well.•The results of the measurements showed that particular chemicals act as mixed-type inhibitors.•The outcomes show a high level of corrosion inhibition effectiveness.