Thermodynamic and activation parameters were determined to discuss the inhibitory behaviour of Both OEAq and OEEt were seen to act asĪ mixed type inhibitors from PDP study and according to EIS technical, their corrosion process is charge transferĬontrolled. The inhibition efficiency of each inhibitor increases sharply with increasing concentration and a decreasing ofĮfficiency was observed with increasing temperature for both inhibitors. Experimental results revealed that OEAq and OEEt can be considered as good green inhibitorsĪnd that OEAq is more efficient than OEEt with a maximum inhibition efficiency of 94.1% at 0.4 g/L at 303 K. An appreciable inhibitory effect for both tested inhbitory has been obtained from all theĬombined results. Potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) in order to advance in Various electrochemical techniques was used such as weight loss measurements, The analysis and characterization of both products extracted (OEAq and OEEt) were performed using Referred to in this paper, respectively, as “OEAq and OEEt”) on mild steel corrosion in HCl solutions has beenĮvaluated. The inhibitory effect investigation of aqueous and ethanolic extracts of Origanum elongatum Plant (will be Besides, the correlation between inhibition efficiency and molecular structure of inhibitor was theoretically studied via quantum chemical calculations. The formation and characteristic of protective layer on the steel surface were verified from their spectra of scanning electrochemical microscope (SECM), UV–visible, FT-IR and X-ray photoelectron spectroscopy (XPS) methods. TP and IP are determined as mixed-type inhibitors based on polarization studies, and their adsorption on mild steel surface follows Langmuir adsorption isotherm and physical adsorption is dominant. The experimental results revealed that 1-(2-pyridyl)-2-thiourea and 2-(imidazol-2-yl)-pyridine are effective corrosion inhibitors for mild steel in acid medium, and their maximum corrosion inhibition efficiency at 4 × 10-4 M are 93.57% and 96.66%, respectively. The 1-(2-pyridyl)-2-thiourea (TP) and 2-(imidazol-2-yl)-pyridine (IP) are described here for the first time as inhibitors for mild steel in acid medium based on investigations with weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS).
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