Inhibition of Mild Steel Corrosion in Hydrochloric Acid Solution by New Coumarin
Abstract
:1. Introduction
2. Results and Discussion
2.1. Synthesis
2.2. Electrochemical Measurements
2.2.1. Corrosion Potential (ECORR) Measurements
2.2.2. Polarization Measurements
Conc.(mM) | icorr (μA·cm−2) | ECORR (VSCE) | βa (V·dec−1) | βc (V·dec−1) | IE(%) |
---|---|---|---|---|---|
0 | 660.1 | −0.49 | 0.12 | 0.14 | 0 |
0.1 | 19.1 | −0.53 | 0.08 | 0.14 | 97.1 |
0.2 | 16.2 | −0.55 | 0.13 | 0.13 | 97.5 |
0.3 | 8.76 | −0.52 | 0.06 | 0.09 | 98.6 |
0.4 | 7.72 | −0.51 | 0.05 | 0.1 | 98.8 |
0.5 | 7.36 | −0.51 | 0.05 | 0.1 | 98.8 |
T (°C) | icorr (μA·cm−2) | ECORR (VSCE) | βa (V·dec−1) | βc (V·dec−1) | IE (%) |
---|---|---|---|---|---|
30 | 7.3 | −0.51 | 0.05 | 0.10 | 98.8 |
40 | 35 | −0.538 | 0.07 | 0.10 | 96.6 |
50 | 124 | −0.558 | 0.12 | 0.10 | 94.3 |
60 | 401 | −0.528 | 0.14 | 0.12 | 93.8 |
2.2.3. Electrochemical Impedance Spectroscopy (EIS) Measurements
Conc. (mM) | Rct (ohm·cm2) | IE (%) |
---|---|---|
Blank | 42 | – |
0.1 | 782 | 94.6 |
0.2 | 881 | 95.2 |
0.3 | 932 | 95.5 |
0.4 | 977 | 95.7 |
0.5 | 1087 | 96.1 |
T (°C) | Conc. (mM) | Rct (ohm·cm2) | IE (%) |
---|---|---|---|
30 | Blank | 42 | – |
30 | 0.5 | 1087 | 96.1 |
40 | Blank | 13 | – |
40 | 0.5 | 546 | 97.5 |
50 | Blank | 7 | – |
50 | 0.5 | 195 | 96.4 |
60 | Blank | 3 | – |
60 | 0.5 | 101 | 97.0 |
2.2.4. Electrochemical Frequency Modulation
Conc. (mM) | icorr (μA·cm−2) | βa (V·dec−1) | βc (V·dec−1) | C.R. (mpy) | IE (%) | CF-2 | CF-3 |
---|---|---|---|---|---|---|---|
Blank | 81.7 | 0.09 | 0.27 | 90.2 | – | 1.97 | 2.02 |
0.1 | 61.0 | 0.05 | 0.06 | 27.5 | 25.3 | 4.56 | 2.49 |
0.2 | 43.7 | 0.16 | 0.17 | 20 | 46.4 | 2.79 | 2.11 |
0.3 | 22.4 | 0.09 | 0.10 | 10.2 | 72.5 | 1.79 | 1.70 |
0.4 | 20.9 | 0.08 | 0.09 | 9.5 | 74.3 | 1.80 | 1.78 |
0.5 | 17.8 | 0.08 | 0.09 | 8.1 | 78.2 | 1.34 | 2.42 |
T (°C) | icorr (μA·cm−2) | βa (V·dec−1) | βc (V·dec−1) | C.R. (mpy) | IE (%) | CF-2 | CF-3 |
---|---|---|---|---|---|---|---|
30 | 17.8 | 0.08 | 0.09 | 8.1 | 97.4 | 1.34 | 2.42 |
40 | 37.0 | 0.08 | 0.10 | 16.9 | 96.4 | 2.01 | 4.63 |
50 | 128.1 | 0.08 | 0.16 | 58.6 | 94 | 1.91 | 2.99 |
60 | 370.6 | 0.09 | 0.15 | 123.7 | 94 | 1.91 | 5.67 |
2.3. Scanning Electron Microscopy (SEM)
3. Experimental
3.1. Synthesis
3.1.1. Synthesis of Thiosemicarbazone 1
3.1.2. Synthesis of PMBH N,N′-((2E,2′E)-2,2′-(1,4-phenylenebis(methanylylidene))bis (hydrazinecarbonothioyl))bis(2-oxo-2H-chromene-3-carboxamide) 2
3.2. Electrochemical Measurements
3.3. Surface Analysis
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Kadhum, A.A.H.; Mohamad, A.B.; Hammed, L.A.; Al-Amiery, A.A.; San, N.H.; Musa, A.Y. Inhibition of Mild Steel Corrosion in Hydrochloric Acid Solution by New Coumarin. Materials 2014, 7, 4335-4348. https://doi.org/10.3390/ma7064335
Kadhum AAH, Mohamad AB, Hammed LA, Al-Amiery AA, San NH, Musa AY. Inhibition of Mild Steel Corrosion in Hydrochloric Acid Solution by New Coumarin. Materials. 2014; 7(6):4335-4348. https://doi.org/10.3390/ma7064335
Chicago/Turabian StyleKadhum, Abdul Amir H., Abu Bakar Mohamad, Leiqaa A. Hammed, Ahmed A. Al-Amiery, Ng Hooi San, and Ahmed Y. Musa. 2014. "Inhibition of Mild Steel Corrosion in Hydrochloric Acid Solution by New Coumarin" Materials 7, no. 6: 4335-4348. https://doi.org/10.3390/ma7064335
APA StyleKadhum, A. A. H., Mohamad, A. B., Hammed, L. A., Al-Amiery, A. A., San, N. H., & Musa, A. Y. (2014). Inhibition of Mild Steel Corrosion in Hydrochloric Acid Solution by New Coumarin. Materials, 7(6), 4335-4348. https://doi.org/10.3390/ma7064335