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.
Highlights
The extensive use of mild steel in the construction of petroleum refineries tanks, flow lines and transmission pipelines is as a result of ease of its fabrication and low cost [1]
In the view of above findings, the present study aims to investigate metolazone drug, that is a compound derived from quinazoline substituent, as the corrosion inhibitor for mild steel in hydrochloric acid solution by means of weight loss and electrochemical techniques
These results indicate an inhibitive potential of quinazoline derivative on mild steel corrosion
Summary
The extensive use of mild steel in the construction of petroleum refineries tanks, flow lines and transmission pipelines is as a result of ease of its fabrication and low cost [1]. For solving the resulting corrosion problems for mild steel in acid environment in oil and gas industries, use of corrosion inhibitors is the best practical and cost-effective way. It has already been found that organic compounds which contain either lone pair-donating heteroatoms like N, O, S and P, or structural moieties with -electrons that interact with metal, demonstrate good inhibitive properties [2,4]. Use of these compounds, has recently been restricted due to their high cost and toxicity to the environment [5]. The researchers practicing in the field of metallurgical and material industry, usually release fresh or new corrosion inhibitors, those which are cheap and show highly mitigated competence and less amount of toxicity [6,7]
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