Corrosion Protection Effectiveness and Adsorption Performance of Schiff Base-Quinazoline on Mild Steel in HCl Environment

• Published in: Corrosion science and technology Vol. 21; no. 2; pp. 77 - 88
• Main Authors: Sayyid, Firas F, Mustafa, Ali M, Hanoon, Mahdi M, Shaker, Lina M, Alamiery, Ahmed A
• Format: Journal Article
• Language: Korean
• Published: 한국부식방식학회 30.04.2022
• Subjects: Corrosion inhibitor; DFT; Methylquinazolin; Mild steel; Schiff Base; Schiff Base; Methylquinazolin; Mild steel; DFT; Corrosion inhibitor
• ISSN: 1598-6462

Schiff base quinazoline derivative viz., 3-((2-hydroxy-3-methoxybenzylidene)amino)-2-methylquinazolin-4(3H)-one (SB-Q), was synthesized in this study. Its corrosion protection impact on mild steel (MS) in 1 M hydrochloric acid solution was examined by performing weight loss measurements. The protective efficacy of SB-Q on MS in 1 M HCl was investigated based on its concentrations, immersion period, and immersion temperature. SB-Q was found to be an efficient inhibitor for the corrosion of MS. Its inhibition efficiency was improved by increasing the concentration of SB-Q to an optimal concentration of 500 ppm. Its inhibition efficacy was 96.3% at 303K. Experimental findings revealed that its inhibition efficiency was increased with increasing immersion time, but decreased with an increase in temperature. The adsorption of SB-Q molecules was followed the Langmuir adsorption isotherm model. The adsorption of the examined inhibitor molecules on the surface of mild steel was studied by density functional theory (DFT). DFT investigation confirmed weight loss findings.