Corrosion Inhibition of Mild Steel in Acidic Media by Expired Carbimazole Drug


  • Aisha Al-abbasi Associated Professor
  • Ibrahim E. Shana



Corrosion, Mild Steel, Acidic Medium, Weight Loss, Inhibition Efficiency , Expired Drug, DFT Calculation



The efficiency of the anti-thyroid, Carbimazole, expired drug, (CD), as corrosion inhibitor for mild steel in 0.5MHCl was investigated by weight loss  method. Data obtained from weight loss measurement were analysed, and the results show that, the used Carbimazole drug was a good inhibitor. The inhibition efficiency increases with increasing the concentration of CD inhibitor and reached a maximum value of 84.95% at 30 OC and 100 ppm of the used inhibitor. The adsorption isotherm of CD obeyed Langmuir adsorption isotherm. Quantum chemical calculations based on density function theory, DFT, were performed on CD drug. Calculated parameters such as the highest occupied molecular orbital energy (EHOMO), the lowest unoccupied molecular orbital energy (ELUMO), energy gap (ΔE), dipole moment (µ), electronegativity (), electron affinity (A), global hardness (η), softness (σ) and ionization potential (I), were calculated and correlated to the experimental data.



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D. A. Jones, Principles and Prevention of Corrosion: Prentice Hall, 1996.

B. Sanyal, "Organic compounds as corrosion inhibitors in different environments: A review," Progress in Organic Coatings, vol. 9, pp. 165-236, 1981.

E. Ghali, et al., Corrosion Prevention and Protection: Practical Solutions: Wiley, 2007.

P. Marcus, Corrosion Mechanisms in Theory and Practice, Third Edition: Taylor & Francis, 2011.

R. Javaherdashti, et al., Corrosion and Materials in the Oil and Gas Industries: CRC Press, 2016.

S. A. Abd El–Maksoud, "The Effect of Organic Compounds on the Electrochemical Behaviour of Steel in Acidic Media. A review," Int. J. Electrochem. Sci.,, vol. 3, pp. 528-555, 2008.

K. F. Khaled and N. Hackerman, "Investigation of the inhibitive effect of ortho-substituted anilines on corrosion of iron in 1 M HCl solutions," Electrochimica Acta, vol. 48, pp. 2715-2723, 2003.

M. J. Bahrami, et al., "Experimental and theoretical investigation of organic compounds as inhibitors for mild steel corrosion in sulfuric acid medium," Corros Sci, vol. 52, 2010.

C. M. Goulart, et al., "Experimental and theoretical evaluation of semicarbazones and thiosemicarbazones as organic corrosion inhibitors," Corrosion Science, vol. 67, pp. 281-291, 2012.

M. S. Suliman, Al-abbasi A., "The Synergistic effect of halide ions and organic nitrogen containing compounds on the inhibition of mild steel corrosion in hydrochloric acid solution," in The 6th Libyan corrosion conference 2007, Tripoli. Libya` 2007.

M. Yadav, et al., "New pyrimidine derivatives as efficient organic inhibitors on mild steel corrosion in acidic medium: Electrochemical, SEM, EDX, AFM and DFT studies," Journal of Molecular Liquids, vol. 211, pp. 135-145, 2015.

G. k. Gece, "Drugs: A review of promising novel corrosion inhibitors," Corrosion Science, vol. 53, pp. 3873-3898, 2011.

S. Karthikeyan, "Drugs/Antibiotics as potential corrosion inhibitors for Metals - A Review," International Journal of ChemTech Research, vol. 9, pp. 251-259, 2016.

A. AL-Abbasi, "Study of corrosion inhibition kinetics of steel by using some organic compounds," MSc, CHEMISTRY DEPARTMENT, Sebha University, Sebha, 2006.

S. M. M. M. Al-abbasi A., "The Synergistic Effects of Iodide Ions on the Corrosion Inhibition of Mild Steel in H2SO4 Using phenyl Benzoylthiourea," presented at the The first International Conference on Science and Technology, Sebha / Libya, 2.017.

J. P. Perdew, et al., "Generalized gradient approximation for the exchange-correlation hole of a many-electron system," Physical Review B, vol. 54, p. 16533, 1996.

B. Jon, et al., The generation and use of delocalized internal coordinates in geometry optimization vol. 105: AIP, 1996.

A. D. Becke, "Density-functional exchange-energy approximation with correct asymptotic behavior," Physical Review A, vol. 38, p. 3098, 1988.

C. Lee, et al., "Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density," Physical Review B, vol. 37, p. 785, 1988.

Y. S. Kara, et al., "Theoretical study on the relationship between the molecular structure and corrosion inhibition efficiency of long alkyl side chain acetamide and isoxazolidine derivatives," Protection of Metals and Physical Chemistry of Surfaces, vol. 48, pp. 710-721, 2012.

V. S. Sastri and J. R. Perumareddi, "Selection of Corrosion Inhibitors for Use in Sour Media," CORROSION, vol. 50, pp. 432-437, 1994.

R. G. Pearson, "Absolute electronegativity and hardness: application to inorganic chemistry," Inorganic Chemistry, vol. 27, pp. 734-740, 1988.

A. A. EL-Awady, Abd EL-Nabey, B. A., Aziz, S. G. , "Kinetic‐Thermodynamic and Adsorption Isotherms Analyses for the Inhibition of the Acid Corrosion of Steel by Cyclic and Open‐Chain Amines," J. Electrochem. Soc., vol. 139, pp. 2149-2154, 1992.

I. B. Obot and N. O. Obi-Egbedi, "Anti-corrosive properties of xanthone on mild steel corrosion in sulphuric acid: experimental and theoretical investigations," Curr Appl Phys, vol. 11, 2010.

F. M. Donahue, . and Nobe K., "Theory of Organic Corrosion Inhibitors: Adsorption and Linear Free Energy Relationships," The Electrochemical Society, vol. 112, pp. 886-891, 1965.

J. M. Costa and J. M. Lluch, "The use of quantum mechanics calculations for the study of corrosion inhibitors," Corros Sci, vol. 24, 1984.

G. Gece, "The use of quantum chemical methods in corrosion inhibitor studies," Corros Sci, vol. 50, 2008.

E. E. Ebenso, et al., "Adsorption and quantum chemical studies on the inhibition potentials of some thiosemicarbazides for the corrosion of mild steel in acidic medium," Int J Mol Sci, vol. 11, 2010.

N. A. Wazzan, "DFT calculations of thiosemicarbazide, arylisothiocynates, and 1-aryl-2,5-dithiohydrazodicarbonamides as corrosion inhibitors of copper in an aqueous chloride solution," Journal of Industrial and Engineering Chemistry, vol. 26, pp. 291-308, 2014.

S. Martinez, "Inhibitory mechanism of mimosa tannin using molecular modeling and substitutional adsorption isotherms," Materials Chemistry and Physics, vol. 77, pp. 97-102, 2003.

R. Agrawal, Namboodhiri, TKG. , "The inhibition of sulphuric acid corrosion of 410 stainless steel by thioureas," Corros. Sci., vol. 30 pp. 37-52 1990.