Imidazo [1,2-a] Pyrimidine Derivatives as Effective Inhibitor of Mild Steel Corrosion in HCl Solution: Experimental and Theoretical Studies

Abstract

The inhibitory performance of imidazole [1,2-a] pyrimidine derivatives, namely, 2,4-diphenylbenzo [4,5]imidazo [1,2-a]pyrimidine (DPIP) and 2-(4-octylphenyl)-4-phenylbenzo [4,5]imidazo [1,2-a]pyrimidine (OPIP), against mild steel corrosion in 1 mol L−1 HCl solution was studied by weight loss at different temperatures, potentiodynamic polarization curves (PDP), electrochemical impedance spectroscopy (EIS), and surface analysis technology. The two corrosion inhibitors showed an outstanding inhibition performance, and the inhibition efficiency achieved 91.9% for OPIP and 90.5% for DPIP at a concentration of 0.1 mmol L−1. Electrochemical methods showed that DPIP and OPIP behaved as mixed-type inhibitors. Density function theory (DFT) and molecular dynamic simulation (MD) were approached to theoretically study the relationship of the inhibitor structure and anti-corrosion performance, which were also compatible with the weight loss and electrochemical observations.

Técnicas experimentais e teóricas aplicadas ao estudo de inibidores orgânicos de corrosão em meio ácido

“…Diversos trabalhos utilizando os índices de reatividade têm sido reportados devido a importância dos pontos de ancoragem para a elucidação do mecanismo de inibição (Al-Amiery et al, 2022; K. Cao et al,, 2022;Idir & Kellou-Kerkouche, 2018;John & Joseph, 2013).…”

Synthesis of alkynyl alcohol derivatives and its corrosion inhibition on N80 steel in 5 M HCl

“…[7][8][9] The most widely used organic inhibitors take the isolated pair electrons of O, N, S, P and π electrons in aromatic rings as their main adsorption centres, such as Mannich bases, 10,11 Schiff bases 12,13 and imidazoline derivatives. 14,15 In addition, a large number of studies have indicated that alkyl alcohol derivatives [16][17][18] and alkyl pyridine [19][20][21] have good corrosion inhibition performance on metals in acidic media. For instance, the inhibition efficiency of tetradecyl pyridinium bromide (TDPB) was up to 97.4% (1mM) on aluminium in 1 M HCl at 20 C 22 and proparyl alcohol was 99% (0.107 M) on carbon steel in 15% HCl at 30 C. 23 As mentioned above, both propargyl alcohol and tetradecyl pyridinium bromide exhibit excellent corrosion inhibition properties, and propargyl alcohols behave very well as inhibitors in strongly acidic media.…”

“…Consequently, in the last few decades, there have been many studies focusing on synthetic organic inhibitors for anti‐corrosion in acidic solutions 7–9 . The most widely used organic inhibitors take the isolated pair electrons of O, N, S, P and π electrons in aromatic rings as their main adsorption centres, such as Mannich bases, 10,11 Schiff bases 12,13 and imidazoline derivatives 14,15 . In addition, a large number of studies have indicated that alkyl alcohol derivatives 16–18 and alkyl pyridine 19–21 have good corrosion inhibition performance on metals in acidic media.…”