Effective steel alloy surface protection from HCl attacks using Nepeta Pogonesperma plant stems extract
2022
Shahini, M.H. | Ramezanzadeh, Mohammad | Ramezanzadeh, Bahram
Notwithstanding the wealth and convenience that have been brought by fast-growing technologies globally, they have endangered human and environmental health. The potential rescue missions demand innovative ideas and hard work which is the center of countless research in recent years. Influenced by this motivation, this study employed a new plant extract—Nepeta Pogonesperma extract (NPe)—for the first time in the corrosion-related studies as an inhibitive species in the aggressive environment (1 M HCl) for the mild steel (MS). Several tests for surface and corrosion evaluations were employed including FE-SEM, AFM, EDAX, FT-IR, UV-Vis, GIXRD, Raman, electrochemical spectroscopy (EIS), and potentiodynamic polarization (PP). FE-SEM showed that despite maximum surface corrosion attack taking place for the no-inhibitor-containing sample, after inclusion of NPe, significant enhancement was observed in the surface smoothness. This was then affirmed by AFM analysis. The FT-IR results affirmed the existence of functional groups as well as bonds of NPe molecules on the MS surface. UV-Vis results were indicative of CC along with CO group existence. Raman spectroscopy test demonstrated the existence of some NPe structure’s functional groups. EIS outcome correlated the enhancement of NPe concentration to the improvement of the corrosion-preventive capacity of the surface. Also, it revealed that the maximum inhibition efficiency (92%) was obtained for the solution doped with 1000 ppm of the inhibitive agent at the end of the 5 h exposure period. The PP results bestowed the minimum value of icₒᵣᵣ to the sample confirmed by the EIS test.
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