Experimental and theoretical study on the corrosion inhibitor potential of quinazoline derivative for mild steel in hydrochloric acid solution

Abstract

Interaction of metal surfaces with organic molecules has a significant role in corrosion inhibition of metals and alloys. More clarification, from both experimental and computa­tional view is needed in describing the application of inhibitors for protection of metal surfaces. In this study, the surface adsorption and corrosion inhibition behavior of metol­azone, a quinazoline derivative, on mild steel in 0.02, 0.04, 0.06, and 0.08 M HCl solutions were investigated. Weight loss, potentiodynamic polarization and electrochemical impe­dance spectroscopy techniques were used. The optimum inhibition efficiencies of 75, 82 and 83 % were found by these three techniques at the optimum inhibitor concentration of 500 mg/L and 303 K. Scanning electron microscopy (SEM) was used to confirm adsorption of quinazoline derivative on the surface of the mild steel. Computational simulations were additionally used to give insights into the interaction between quinazoline inhibitor and mild steel surface. Thermodynamic parameters of mild steel corrosion showed that quinazoline derivative functions as an effective anti-corrosive agent that slows down corrosion process. Potentiodynamic polarization results revealed a mixed-type inhibitor, while the result of the adsorption study suggests that adsorption of the inhibitor on the mild steel surface obeys the physical adsorption mechanism and follows Langmuir adsorption isotherm model.

Anticorrosion action of the olive leaf compounds extracted under optimal parameters as determined with experimental design

“…olive leaf extract inhibitor, increases the size of the semi-circle in comparison to the blank solution, and the maximum circle diameter is obtained for 2.8 10 −3 g cm −3 of inhibitor. This shows that there is an increase in the charge transfer resistance, which is in agreement with the literature, 25,26,28 and previous corrosion tests in this work. The improvement in the resistance by increasing the inhibitor concentration is due to an adsorption of inhibitor molecules on the surface of the steel, indicating the effective blocking of the surface.…”

Glyceral Trinitrate: As Potential Corrosion Protector for Mild Steel in Acid Medium Along with Paint-coated Steel in a Saline Environment

“…The measurements obtained after 3 h, 6 h, 12 h and 24 h immersion time at 298K with different concentartion of GTN (5-60 mg/L) was clearly predicted in Table 1. Thus as the inhibitor GTN concentration increases there is a increase in the I. E(%) [29][30][31][32][33] and corrosion rates decreases. The result shows that the metal surface are blocked by the GTN inhibitor molecules from the corrosion solution.…”

Pouteria sapota as green CO2-corrosion inhibition of carbon steel

“…One of the most frequently used methods to mitigate CO2-corrosion is by applying organic inhibitors, where the presence of heteroatoms including phosphorus, nitrogen, sulfur and carbon protects steel surface by forming a barrier of corrosion products. In such a way, metals are protected from the action of the environment [3][4][5][6][7][8][9][10]. However, due to serious environmental concerns, a lot of research concerning less toxic, cheaper, and more environmentally friendly compounds has been undertaken in the last years [11][12][13].…”