Electrochemical, Activations and Adsorption Studies for the Corrosion Inhibition of Low Carbon Steel in Acidic Media

 

A. A. Khadom,^1,*A. S. Yaro,² A. S. AlTaie,²A. A. H. Kadum¹

 

¹ Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Kebangsaan Malaysian University, Bangi, 43600, Selangor, Malaysia

²Chemical Engineering Dept., College of Engineering, Baghdad University, Baghdad, Iraq

 

Received 10 May 2009; accepted 11 December 2009

 

Abstract

The effect of phenylthiourea as a corrosion inhibitor for low carbon steel at different hydrochloric acid concentrations, different temperatures and fixed speed of electrode rotation, were addressed in this work. Polarization technique was used to evaluate the corrosion rates parameters. The corrosion rate of low carbon steel increases with temperature and follows Arrhenius equation in all acid concentrations in presence and absence of the inhibitor. Detailed thermodynamic parameters of activation (ΔH_act and ΔS_act) for the corrosion reaction were obtained using nonlinear estimation method, while adsorption parameters (ΔG_ads, ΔH_ads and ΔS_ads) were obtained using graphical method. Maximum inhibitor efficiency was (96.44%) obtained at 1 M HCl at 333 K and 1 g/L inhibitor concentration.

Keywords: corrosion, low carbon steel, adsorption, activation parameters.

 

Full text only in PDF format

Textodisponível em PDF

 

References

1.      S.S. Abd El-Rehim, S.A.M. Refaey, F. Taha, M.B. Saleh, R.A. Ahmed, Corrosion inhibition of mild steel in acidic medium using 2-amino thiophenol and 2-cyanomethyl benzothiazole, J.  Appl. Electrochem. 31 (2001) 429-435.

2.      M. Elachauri, M.S. Hajji, S. Kertit, E.M. Salem, R. Coudert, Corrosion of iron in electrolytic anhydrous methanol solutions containing ferric chloride, Corros. Sci. 37 (1995) 823-381.

3.      B. Mernari, H. Elattari, M. Traisnel, F. Bentiss, M. Lagrenee, Electrochemical and quantum chemical studies of 3,5-Di (n-Tolyl)-4-amino-1,2,4-triazole adsorption on mild steel in acidic media, Corrosion 58 (2002) 399-407.        [ Links ]

4.      L. Wang, Evaluation of 2-mercaptobenzimidazole as corrosion inhibitor for mild steel in phosphoric acid, Corros. Sci. 43 (2001) 2281-2289.

5.      M.E. Azhar, M. Mernari, M. Traisnel, F. Bentiss, M. Lagrenee, Corrosion inhibition of mild steel by the new class of inhibitors [2,5-bis(n-pyridyl)-1,3,4-thiadiazoles] in acidic media, Corros. Sci. 43 (2001) 2229-2238.

6.      F. Bentiss, M. Traisnel, M. Lagrenee, The substituted 1, 3, 4-oxadiazoles: a new class of corrosion inhibitors of mild steel in acidic media, Corros. Sci. 42 (2000) 127-146.

7.      M.A. Quraishi, Sudhish Kumar Shukla, Poly (aniline-formaldehyde): A new and effective corrosion inhibitor for mild steel in hydrochloric acid, Mater. Chem. Phys. 113 (2009) 685–689.

8.      L.R. Chauhan and G. Gunasekaran, Corrosion inhibition of mild steel by plant extract in dilute HCl medium, Corros. Sci. 49 (2007) 1143–1161.

9.      C.B. Shen, S.G. Wang, H.Y. Yang, K. Long, F.H. Wang, Corrosion and corrosion inhibition by thiourea of bulk nanocrystallized industrial pure iron in dilute HCl solution, Corros. Sci. 48 (2006) 1655–1665.

10.    M.A. Quraishi, M.A.W. Khan, M. Ajmal,Influence of some thiazole derivatives on the corrosion of mild steel in hydrochloric acid, Anti-Corros. Methods Mater. 43 (1996) 5-8.

11.    S.A. Ali, M.T. Saeed, S.V. Rahman, The isoxazolidines: a new class of corrosion inhibitors of mild steel in acidic medium, Corros. Sci. 45 (2003) 253-266.

12.    E. Bardal, Corrosion and Protection, Springer-Verlag London Limited, 2004.

13.    H. Yamaoka, H. Fischer, Zum mechanismus der inhibitionswirkung organischer verbindungen im system eisen/säure—III. Reaktive fremdstoffbelegungen, Electrochemica Acta 10 (1965) 679-711.

14.    H. Ashassi-Sorkhabi, B. Shabani, B. Aligholipour, D. Seifzadeh, The effect of some Schiff bases on the corrosion of aluminum in hydrochloric acid solution, Appl. Surf. Sci. 252 (2006) 4039-4047.

15.    M. Bouklah, N. Benchat, A. Aouniti, B. Hammouti, I.M. Benkaddour, M. Lagreniee, H. Vezin, F. Bentiss, Effect of the substitution of an oxygen atom by sulphur in a pyridazinic molecule towards inhibition of corrosion of steel in 0.5 M H₂SO₄ medium, Prog. Org. Coat. 51 (2004) 118-124.

16.    H. Ashassi-Sorkhabi, B. Shaabani, D. Seifzadeh, Corrosion inhibition of mild steel by some Schiff base compounds in hydrochloric acid, Appl. Surf. Sci. 239 (2005) 154-164.

17.    Ehteram A. Noor, Evaluation of inhibitive action of some quaternary N-heterocyclic compounds on the corrosion of Al–Cu alloy in hydrochloric acid, Mater. Chem. Phys. 114 (2009) 533–541.

18.    L. L. Shereir, Corrosion, vol. 2, 2^nd edition, Newnes-Butterworths, London, 1977.

19.    L.D. Mall, V.C. Srivastava, N.K. Agrawal, I.M. Mishra, Adsorptive removal of malachite green dye from aqueous solution by bagasse fly ash and activated carbon-kinetic study and equilibrium isotherm analyses, Colloids Surf. A: Physicochem. Eng. Aspects 264 (2005) 17-28.

20.    S.A. Umoren, E.E. Ebenso, The synergistic effect of polyacrylamide and iodide ions on the corrosion inhibition of mild steel in H₂SO₄, Mater. Chem. Phys. 106 (2007) 387-393.

21.    S.A. Umoren, I.B. Obot, E.E. Ebenso,Corrosion inhibition of aluminum using exudate gum from Pachylobus edulis in the presence of halide ions in HCl, E-journal Chem. 5 (2008) 355-364.

22.    W.W. Damaskin, O.A. Pietrij, W.W. Batrakow, Adsorption of Organic Compounds on Electrode, Plenum Press, New York, 1971.

23.    Badiea A. Mohammed, Kikkeri N. Mohana,The effect of sodium benzoate and sodium 4-(phenylamino)benzenesulfonate on the corrosion behavior of low carbon steel, Monatsh Chem/Chemical Monthly 140 (2009) 1–8.

24.    W. Durnie, R.D. Marco, A. Jefferson, B. Kinsella,Development of a structure-activity relationship for oil field corrosion inhibitors, J. Electrochem. Soc. 146 (1999) 1751-1756.

25.    S.A. Ali, A.M. El-Shareef, R.F. Al-Ghamdi, M.T. Saeed, The isoxazolidines: the effects of steric factor and hydrophobic chain length on the corrosion inhibition of mild steel in acidic medium, Corros. Sci. 47 (2005) 2659-2678.

26.    M. Abdallah and M.M. El-Naggar, Cu⁺² cation + 3, 5-dimethyl pyrazole mixture as a corrosion inhibitor for carbon steel in sulfuric acid solution, Mater. Chem. Phys. 71 (2001) 291-298.

27.    A. Bousseksou, G. Molnár, J.A. Real, K. Tanaka,Spin crossover and photomagnetism in dinuclear iron(II) compounds, Coord. Chem. Rev. 251 (2007) 1822-1833.

28.    G. Mu, X. Li, G. Liu, Synergistic inhibition between tween 60 and NaCl on the corrosion of cold rolled steel in 0.5 M sulfuric acid, Corros. Sci. 47 (2005) 1932-1952.

 

^*Corresponding author. aneesdr@gmail.com