Carbon steel corrosion inhibition in H2SO4 0.5 M medium by thiazole-based molecules: Weight loss, electrochemical, XPS and molecular modeling approaches
Graphical Abstract
Introduction
Metal corrosion has been seen as a major problem in many industries. During the corrosion awareness day, it was pointed out that the annual cost of corrosion amounted to US $ 2500 billion [1] making the protection of assets against corrosion is essential. However, this cost can be reduced if the use of highly efficient corrosion reduction technologies is made. One such method to control metallic corrosion is the use of inhibitors [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12] in acidic medium. The literature reveals that the presence of hetero-atoms, non-bonding electrons and π-electrons make the organic compound an efficient corrosion inhibitor [13], [14], [15], [16]. Thiazolic and their derivatives have been shown to be good inhibitors. This is due to their polar groups and potential for complexation with the metal surface. In addition, they exhibit different pharmacobiological properties [17], [18], [19], [20]. The objective of this study is to evaluate the anticorrosion performance of three synthesized thiazolic compounds, namely 3-(2-methoxyphenyl)−4-methylthiazol-2(3H)-thione (P1), 3-phenyl-4-methylthiazol-2(3H)-thione (P2) and 3-(2-methyl-phenyl)−4-methylthiazol-2(3H)-thione (P3) using weight loss measurement and electrochemical techniques (polarization curves and impedance spectroscopy). The carbon steel surface was also examined by X-ray photoelectron spectroscopy (XPS). Quantum chemistry calculations and molecular dynamic simulation (MD) have been established.
Section snippets
Inhibitors
See Table 1.
Material and solution
The detailed description of the nature of the steel, its preparation as well as the acid solution used during this study was given in one of our works published previously [13].
Weight loss tests
Weight loss measurement was used to evaluate the inhibition action of the three inhibitors. The corrosion rate (C.R.) and inhibition efficiency (EICR%) were calculated from (1), (2):where m0 and mi are the mass of carbon steel before and after immersion, S its and t is the time of immersion (1 h).
Effect of concentration
The variation of the weight loss (1 h of immersion) at 303 K is displayed in Table 2.
Even though weight loss are primary results, they are of great interest and give basic insights about the performance of tested compounds. Based on this finding, we could obviously assume that tested thiazole derivatives act by adsorption on the steel surface, which can be favored by the presence of several nonbonding electrons on heteroatoms of functional groups.
(-CH3, -OCH3), and π-electrons of the aromatic
Conclusion
Three thiazole derivatives were tested as corrosion inhibitors for carbon steel in H2SO4 solution in this study. Weight loss, electrochemical, and XPS investigations were used to characterize the performance of inhibitors in depth. In addition, using DFT and MD simulations, the interactions between inhibitor molecules and carbon steel were investigated theoretically. The three inhibitors were found to be highly efficient against carbon steel corrosion in H2SO4, with P1 inhibitor having the best
Declaration of Competing Interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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