Abstract
The influence of indole and 2-oxyindole on the corrosion rate of α-brass in 1M HNO3 was investigated using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. It was found that the investigated compounds behave as inhibitors. The inhibition efficiency increases with increasing the inhibitor concentration, but decreases with increasing the temperature. The adsorption of these compounds on the a-brass surface follows Langmuir's adsorption isotherm. The electrochemical results indicated that all the investigated compounds act as mixed-type inhibitors. Some thermodynamic parameters for corrosion processes were determined and discussed. The results obtained from chemical and electrochemical techniques were in good agreement.
| Original language | English |
|---|---|
| Pages (from-to) | 1691-1702 |
| Number of pages | 12 |
| Journal | Journal of Materials and Environmental Science |
| Volume | 5 |
| Issue number | 6 |
| State | Published - 2014 |
| Externally published | Yes |
Keywords
- Corrosioninhibition
- HNO
- Indole
- Oxyindole, EIS
- α-brass