Corrosion inhibition properties of schiff base derivative against mild steel in HCl environment complemented with DFT investigations

Abstract

There is growing interest in using corrosion inhibitors and protective treatments to limit the degradation of mild steel, leading to the development of numerous Schiff bases as cutting-edge inhibitors. In this study, the effectiveness of a Schiff base, 3-((5-mercapto-1,3,4-thiadiazol-2-yl)imino)indolin-2-one (MTIO), to prevent mild steel corrosion in HCl was investigated using weight loss measurements, potentiodynamic polarization measurements, electrochemical impedance spectroscopy techniques, and surface characterization. The experimental results showed that 0.5 mM MTIO exhibited a satisfactory inhibitor efficiency of 96.9% at 303 K. The MTIO molecules physically and chemically adsorbed onto the mild steel surface following the Langmuir model, forming a compact protective film attributed to the presence of a thiazole ring in the MTIO structure. Theoretical calculations were combined with experimental techniques to investigate the anticorrosion performance and mechanism of inhibition.

Effect of Adsorption and Interactions of New Triazole-Thione-Schiff Bases on the Corrosion Rate of Carbon Steel in 1 M HCl Solution: Theoretical and Experimental Evaluation

“…Accordingly, the interaction of TMAT and DMTMAT inhibitors on the C-steel surface may occur through both physisorption and chemisorption, preventing corrosion. The anticorrosion efficiencies of a number of different Schiff bases are compared in Table . − ,− …”

“…However, researchers are still interested so far in improving the heterocycle’s ability to further suppress metallic corrosion. One strategy for this is to add extra moieties or functional groups to their structure. ,− Based on the above, it is clear that the unique structure of Schiff bases contains electron-donating nitrogen atoms, which makes them act as strong chelating agents that like to chemically attach to the metal surface. Not only this but also in acidic environments, they can be protonated, which helps them physically adsorb to the metal surface to form a protective corrosion layer.…”

Design of New Ecofriendly Schiff Base Inhibitors for Carbon Steel Corrosion Protection in Acidic Solutions: Electrochemical, Surface, and Theoretical Studies

“…The coordination of the imine group with the ions on the metallic surface is responsible for this strong behavior. Generally, Schiff bases are created from low-cost precursors by combining an aldehyde or ketone with the condensation-NH 2 moiety . In addition, Schiff bases derived from amino acids have attracted the attention of researchers owing to their use in numerous pharmacological applications and other fields. − Furthermore, they are considered suitable anticorrosion materials due to their efficacy against corrosion problems in multiple environments.…”

Corrosion Inhibition of Carbon Steel by Some Schiff Base Compounds in HCl and H2SO4 Solutions

“…These compounds exhibit numerous desirable chemical properties and find applications in various fields, making them a subject of extensive investigation [15] . Consequently, Schiff bases have emerged as promising candidates for corrosion inhibitors due to their excellent adsorption and film‐forming properties in recent years [16–25] . In particular, several Schiff bases have been identified as effective corrosion inhibitors for mild steel, [26–32] aluminum, [33,34] and copper [35,36] in media containing HCl [26,37] and H 2 SO 4 [30,31] .…”

“…For example recently Betti et al. investigated the corrosion protection of a novel Schiff base, 3‐((5‐mercapto‐1,3,4‐thiadiazol‐2‐yl) imino)indolin‐2‐one (MTIO), and achieved 96.9 % inhibition efficiency for mild steel in HCl solution [18] …”