Hanafi, Wan Nur Huda Wan and Hamidon, Tuan Sherwyn and Hussin, M. Hazwan and Awang, Khalijah and Litaudon, Marc and Raja, Pandian Bothi and Azmi, Mohamad Nurul (2024) Kopsia terengganensis ` alkaloids as potential green inhibitors for mild steel corrosion in CO 2-saturated 3.5% NaCl medium. Geoenergy Science and Engineering, 239. p. 212992. ISSN 2949-8929, DOI https://doi.org/10.1016/j.geoen.2024.212992.
Full text not available from this repository.Abstract
The corrosion inhibition potential of alkaloids from Kopsia terengganensis bark extract (KTBE) in mitigating the mild steel corrosion in a CO 2 -saturated 3.5% NaCl medium was evaluated. Standard corrosion evaluation methods, including weight loss test, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PD) were employed, which revealing a concentration -dependent enhancement in KTBE ` s inhibition efficiency. At 500 ppm, the corrosion inhibition efficiency recorded the highest value of 90.63% based on the weight loss study and 87.38% based on electrochemical analysis. Tafel slopes in PD studies affirmed that KTBE functioned as an anodic -type inhibitor. The adsorption of the inhibitor is in accordance with the Langmuir adsorption isotherm with an adsorption free energy ( Delta G degrees ads ) of -26.47 kJ/mol, suggesting the binding of KTBE molecules by means of physisorption. Surface analysis conducted through scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy, and Fourier transform infrared spectroscopy (FTIR) confirmed the formation of a protective inhibitive layer on the surface of mild steel. The proposed corrosion inhibition mechanism involves electrostatic interactions between KTBE molecules and the mild steel surface. This comprehensive investigation underscores KTBE ` s potential as an effective corrosion inhibitor in corrosive environments.
| Item Type: | Article |
|---|---|
| Funders: | FRGS Grant from the Ministry of Higher Education Malaysia (FRGS/1/2018/STG01/USM/01/5) |
| Uncontrolled Keywords: | Kopsia terengganensis bark; Alkaloid; Corrosion inhibition; CO2 saturated 3.5% NaCl medium; Mild steel |
| Subjects: | Q Science > QD Chemistry T Technology > TP Chemical technology |
| Divisions: | Faculty of Science > Department of Chemistry |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 17 Sep 2024 03:39 |
| Last Modified: | 17 Sep 2024 03:39 |
| URI: | http://eprints.um.edu.my/id/eprint/45111 |
Actions (login required)
 |
View Item |
