| Autor: |
Saad Ghareba, Simon Kwan, Sasha Omanovic |
| Jazyk: |
angličtina |
| Rok vydání: |
2015 |
| Předmět: |
|
| Zdroj: |
Journal of Electrochemical Science and Engineering, Vol 5, Iss 3 (2015) |
| Druh dokumentu: |
article |
| ISSN: |
1847-9286 |
| DOI: |
10.5599/jese.242 |
| Popis: |
The current study reports results on the investigation of the possibility of using 11-aminoundecanoic acid (AA) as an inhibitor of general corrosion of carbon steel (CS) in HCl under a range of experimental conditions: inhibitor concentration, exposure time, electrolyte temperature and pH and CS surface roughness. It was found that AA acts as a mixed-type inhibitor, yielding maximum inhibition efficiency of 97 %. The adsorption of AA onto the CS surface was described by the Langmuir adsorption isotherm. The corresponding apparent Gibbs free energy of AA adsorption on CS at 295 K was calculated to be −30.2 kJ mol–1. The adsorption process was found to be driven by a positive change in entropy of the system. PM-IRRAS measurements revealed that the adsorbed AA layer is amorphous, which can be attributed to the repulsion between the neighboring positively charged amine groups and a high heterogeneity of the CS surface. It was also found that the AA provides very good corrosion protection of CS of various surface roughness, and over a prolonged time. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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