Tiazofurin drug as a new and non-toxic corrosion inhibitor for mild steel in HCl solution: Experimental and quantum chemical investigations

The corrosion inhibition performance of tiazofurin, as a new corrosion inhibitor, was evaluated using weight loss measurements, electrochemical methods, X-ray photoelectron spectroscopy (XPS), quantum chemical analysis, and scanning electron microscopy (SEM). The inhibitive performance increases with tiazofurin concentration but decreases with temperature. At a concentration of 400 ppm, the maximum inhibition efficiency (-97%) is achieved. Adsorption of tiazofurin obeys the Langmuir adsorption iso-therm, and thermodynamic parameters show that the adsorption is governed by physiochemisorption. Based on the XPS analysis and theoretical quantum chemical studies, tiazofurin molecules adsorb to the steel surface presumably due to the donor-acceptor interactions between the S and N atoms of tia-zofurin and vacant d-orbitals of Fe atoms. Electron microscopy examinations also validated the meaning-ful decrease in the corrosion rate in the presence of tiazofurin.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

The corrosion inhibition performance of a new corrosion inhibitor called tiazofurin was evaluated using various techniques including weight loss measurements, electrochemical methods, X-ray photoelectron spectroscopy (XPS), quantum chemical analysis, and scanning electron microscopy (SEM). The results showed that the inhibitive performance of tiazofurin increased with its concentration but decreased with temperature. At a concentration of 400 ppm, the maximum inhibition efficiency of -97% was achieved. The adsorption of tiazofurin on the steel surface followed the Langmuir adsorption isotherm and was mainly governed by physiochemisorption. The analysis and studies revealed that tiazofurin molecules adsorb to the steel surface through donor-acceptor interactions between the S and N atoms of tiazofurin and the vacant d-orbitals of Fe atoms. Electron microscopy examinations also confirmed the significant decrease in corrosion rate in the presence of tiazofurin.