Abstract
The inhibition effect of Atropa Belladonna extract (ABE) on the corrosion of carbon steel in 1 M HCl solution was investigated by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The adsorption process obeyed a Langmuir adsorption isotherm. ABE acts as a mixed-type but mainly anodic inhibitor in 1 M HCl. The calculated adsorption thermodynamic parameters indicated that the adsorption was a spontaneous, exothermic process accompanied by an increase in entropy. The maximum inhibition approached 96.6% in the presence of 500 ppm ABE using Tafel polarization technique. Quantum chemical parameters were also calculated, which provided reasonable theoretical explanation for the adsorption and inhibition behavior of ABE on C-steel. ABE constituents have been simulated as adsorbate on Fe (1 1 0) substrate and the adsorption energy have been identified on iron surface. The results obtained from different electrochemical techniques and theoretical calculations were in good agreement.
| Original language | English |
|---|---|
| Pages (from-to) | 1468-1487 |
| Number of pages | 20 |
| Journal | International Journal of Electrochemical Science |
| Volume | 9 |
| Issue number | 3 |
| State | Published - Mar 2014 |
| Externally published | Yes |
Keywords
- Atropa Belladonna
- Carbon steel
- Corrosion inhibition
- EFM
- EIS
- HCl
- Potentiodynamic polarization
- Quantum calculation