Abstract
The corrosion inhibition of carbon steel in 1M HCl solution by Mentha pulegium oil was investigated using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopic techniques (EIS). Surface characterization was performed using optical profiler images and AFM analysis. The effect of temperature on the corrosion behavior of carbon steel was studied in the range of 298-338 K. Inhibition efficiency of 81% was achieved with 3 mL/L of M. pulegium oil at 298 K. The adsorption of the inhibitor molecules on the steel surface obeys the Temkin adsorption isotherm and involves physical adsorption. The thermodynamic calculation results indicate strong interaction between inhibitor molecules and carbon steel surface. The polarization studies showed that the oil acts as mixed-type inhibitor with predominance cathodic. Double layer capacitance, (Cdl) decrease indicates that a layer was form indicating the formation of a surface film. This reflects that the inhibitor does retard the corrosion rate.
| Original language | English |
|---|---|
| Pages (from-to) | 724-731 |
| Number of pages | 8 |
| Journal | Journal of Molecular Liquids |
| Volume | 216 |
| DOIs | |
| State | Published - 1 Apr 2016 |
Bibliographical note
Publisher Copyright:© 2016 Elsevier B.V. All rights reserved.
Keywords
- AFM
- Acid inhibition
- Carbon steel
- EIS
- Polarization
- Weight loss
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Spectroscopy
- Physical and Theoretical Chemistry
- Materials Chemistry
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