Abstract
Inhibition performance as well as the growth and decay laws of films formed on Q235 steel in a saturated carbon dioxide salt solution of imidazoline and imidazoline with a thioureido group were investigated by polarization curve and electrochemical impedance spectroscopy (EIS) techniques. Results showed that both types of imidazoline derivative inhibitors were mix-type inhibitors which mainly inhibited anodic processes. At 85 °C, the film formed in 40 mg ·L-1 of the non-thioureido imidazoline inhibitor formed slowly and had poorer adsorption capability than the thioureido-containing imidazoline inhibitor. The non-thioureido imidazoline inhibitor also disrobed easily from the steel. The film of thioureido-containing imidazoline can auto-repair itself. It also had better adsorption and inhibition efficiency compared with the non-thioureido imidazoline inhibitor. The hydrolyzed imidazoline with a thioureido group has poor absorption capability and its film life and inhibition efficiency decreased compared with the thioureido-containing imidazoline inhibitor. In this paper electrochemical results are also explained using quantum chemistry analysis.
| Original language | English |
|---|---|
| Pages (from-to) | 525-531 |
| Number of pages | 7 |
| Journal | Wuli Huaxue Xuebao/ Acta Physico - Chimica Sinica |
| Volume | 25 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 2009 |
| Externally published | Yes |
Keywords
- Electrochemical impedance spectroscopy
- Imidazoline inhibitor membrane
- Molecular structure
- Polarization curve
- Quantum chemistry