Alkaloid Extract from Chimarrhis cymosa as a Corrosion Inhibitor for C38 Steel in 1M Hydrochloric Acid: Electrochemical and XPS Studies
Abstract
1. Introduction
2. Materials and Methods
2.1. Specimen Preparation and Solution for Corrosion Tests
2.2. Preparation of Plant Extract
2.3. Electrochemical Measurements
2.4. XPS
3. Results and Discussion
3.1. Polarization Curves
3.2. Electrochemical Impedance Spectroscopy
3.3. Surface Analysis Results
3.4. Adsorption Isotherms
3.5. Mechanism of Inhibition
- These molecules exist in cationic form and can interact with the negatively charged metal surface following the adsorption of chloride ions “Cl−” on the metal surface.
- The adsorption of these molecules can also occur directly through “donor–acceptor” bonds between the π electrons (heterocyclic compounds and heteroatoms) and the vacant “d” orbitals of iron atoms.
- Cymoside is one of several alkaloids present in the extract, and it is not the only active compound. The discussion of the inhibition mechanism focused on cymoside because it is currently the only alkaloid that has been isolated and identified. However, it is important to note that at this pH, any alkaloid present in the extract would be protonated, which could contribute to the observed findings.
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Concentration mg L−1 | Ecorr vs. SCE | Rp | IE Rp |
---|---|---|---|
(mV) | (Ω cm2) | (%) | |
1M HCl | −460 | 76 | |
AECC | |||
25 | −466 | 241 | 68 |
50 | −487 | 282 | 73 |
100 | −471 | 555 | 86 |
200 | −472 | 697 | 89 |
Concentration (mg L−1) | Rt | 104 Q | n | IE |
---|---|---|---|---|
(Ω cm2) | (Ω−1·sn) | (%) | ||
1M HCl | 49 | 9.50 | 0.753 | — |
AECC | ||||
25 | 163 | 3.69 | 0.766 | 70 |
50 | 253 | 3.05 | 0.771 | 81 |
100 | 363 | 2.4 | 0.780 | 86 |
200 | 496 | 1.53 | 0.792 | 90 |
Concentration (mg L−1) | IE (%) | Langmuir | Frumkin | Temkin | |||
---|---|---|---|---|---|---|---|
θ | C/θ (mg L−1) | θ | Ln[C(1 − θ)/θ] (mg L−1) | θ | Ln C (mg L−1) | ||
25 | 69.9386 | 0.699386 | 35.7456 | 0.699386 | 2.3744 | 0.699386 | 3.2188 |
50 | 80.6324 | 0.806324 | 60.3286 | 0.806324 | 2.3349 | 0.806324 | 3.9120 |
100 | 86.5013 | 0.865013 | 115.6050 | 0.865013 | 2.7475 | 0.865013 | 4.6051 |
200 | 90.1209 | 0.901209 | 221.9239 | 0.901209 | 3.0875 | 0.901209 | 5.2983 |
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Said-Ahmed, M.; Lebrini, M. Alkaloid Extract from Chimarrhis cymosa as a Corrosion Inhibitor for C38 Steel in 1M Hydrochloric Acid: Electrochemical and XPS Studies. Metals 2025, 15, 523. https://doi.org/10.3390/met15050523
Said-Ahmed M, Lebrini M. Alkaloid Extract from Chimarrhis cymosa as a Corrosion Inhibitor for C38 Steel in 1M Hydrochloric Acid: Electrochemical and XPS Studies. Metals. 2025; 15(5):523. https://doi.org/10.3390/met15050523
Chicago/Turabian StyleSaid-Ahmed, Mahado, and Mounim Lebrini. 2025. "Alkaloid Extract from Chimarrhis cymosa as a Corrosion Inhibitor for C38 Steel in 1M Hydrochloric Acid: Electrochemical and XPS Studies" Metals 15, no. 5: 523. https://doi.org/10.3390/met15050523
APA StyleSaid-Ahmed, M., & Lebrini, M. (2025). Alkaloid Extract from Chimarrhis cymosa as a Corrosion Inhibitor for C38 Steel in 1M Hydrochloric Acid: Electrochemical and XPS Studies. Metals, 15(5), 523. https://doi.org/10.3390/met15050523