A New Green Ionic Liquid-Based Corrosion Inhibitor for Steel in Acidic Environments
Abstract
:1. Introduction
2. Results and Discussion
2.1. Preparation of Octadecylammonium Tosylate (ODA-TS) and Oleylammonium Tosylate (OA-TS)
2.2. Surface Properties of OA-TS and ODA-TS
Compounds | Cac mol/L | γcac mN/m | (−∂ γ/∂ lnc) | Γmax × 10 10 mol/cm2 | Amin nm2/molecule | −ΔG kJ·mol−1 | |
---|---|---|---|---|---|---|---|
ΔGagg | ΔGads | ||||||
ODA-TS | 0.0002 | 31.3 | 8.41 | 3.51 | 0.047 | 20.39 | 21.55 |
OA-TS | 0.0004 | 25.1 | 13.14 | 5.50 | 0.030 | 18.73 | 19.58 |
2.3. Contact Angle and Surface Free Energy Measurements
Concentrations (mmol/L) | Surface Free Energy (mJ/m2) | |
---|---|---|
ODA-TS | OA-TS | |
0 | 5.1 | 5.1 |
0.272 | 8.9 | 6.5 |
2.84 | 10.6 | 7.6 |
5.70 | 12.4 | 8.5 |
11.36 | 14.2 | 10.8 |
22.73 | 16.1 | 12.2 |
2.4. Monitoring the Open Circuit Potential (EOCP)
2.5. Polarization Measurements
Concentrations (mmol/L) | Polarization Method | EIS Method | |||||||
---|---|---|---|---|---|---|---|---|---|
ba (mV) | bc (mV) | Ecorr (V) | Icorr μA/cm2 | C.R. mm/year | IE% | Rct Ohm | Cdl (μF/cm2) | IE% | |
Blank | 69 | 120 | −0.3955 | 839 | 9.7324 | ____ | 1.80 | 334 | ____ |
0.023 | 46 | 202 | −0.3242 | 73 | 0.2204 | 91.1 | 21.6 | 105 | 91.6 |
0.114 | 56 | 125 | −0.3784 | 44 | 0.1392 | 94.7 | 35 | 103 | 94.8 |
0.341 | 53 | 156 | −0.3775 | 31 | 0.1160 | 96.3 | 54 | 101 | 96.6 |
Concentrations (mmol/L) | Polarization Method | EIS Method | |||||||
---|---|---|---|---|---|---|---|---|---|
ba (mV) | bc (mV) | Ecorr (V) | Icorr μA/cm2 | C.R. mm/year | IE% | Rct Ohm | Cdl (μF/cm2) | IE% | |
Blank | 69 | 120 | −0.3955 | 839 | 9.7324 | ____ | 1.80 | 334 | ____ |
0.023 | 40 | 206 | −0.3235 | 19 | 0.8468 | 97.7 | 65.7 | 95 | 97.2 |
0.114 | 42 | 153 | −0.3369 | 12 | 0.5104 | 98.5 | 80.7 | 93 | 97.7 |
0.341 | 48 | 116 | −0.3606 | 10 | 0.3596 | 98.8 | 90.3 | 91 | 98.0 |
2.6. Electrochemical Impedance Spectroscopy (EIS)
2.7. SEM and EDX Measurements
2.8. Mechanism of Corrosion Inhibition
3. Experimental Section
3.1. Materials
3.2. Synthesis Procedure
3.3. Characterization
3.4. Electrochemical Measurements
4. Conclusions
- (1)
- OA-TS and ODA-TS can act as an effective corrosion inhibitor for steel in 1 M hydrochloric acid.
- (2)
- OA-TS and ODA-TS act as a mixed type inhibitor retarding the anodic and cathodic reactions.
- (3)
- The electrochemical results indicated that the protection efficiency of the inhibitor is highly dependent upon concentration and attains a maximum value (98%) at an inhibitor concentration of 150 ppm.
- (4)
- EIS data indicated that the charge transfer resistances increase with the addition of inhibitor and the corrosion process is mainly controlled by charge transfer reactions.
- (5)
- SEM and EDX techniques revealed the formation of protective films on the steel surface.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Atta, A.M.; El-Mahdy, G.A.; Al-Lohedan, H.A.; Ezzat, A.R.O. A New Green Ionic Liquid-Based Corrosion Inhibitor for Steel in Acidic Environments. Molecules 2015, 20, 11131-11153. https://doi.org/10.3390/molecules200611131
Atta AM, El-Mahdy GA, Al-Lohedan HA, Ezzat ARO. A New Green Ionic Liquid-Based Corrosion Inhibitor for Steel in Acidic Environments. Molecules. 2015; 20(6):11131-11153. https://doi.org/10.3390/molecules200611131
Chicago/Turabian StyleAtta, Ayman M., Gamal A. El-Mahdy, Hamad A. Al-Lohedan, and Abdel Rahman O. Ezzat. 2015. "A New Green Ionic Liquid-Based Corrosion Inhibitor for Steel in Acidic Environments" Molecules 20, no. 6: 11131-11153. https://doi.org/10.3390/molecules200611131