Electrochemical Investigation of the Inhibitive Effect of a New Synthetic Schiff-base on the Corrosion of Mild Steel in Acidic Media

In this work the inhibition effect of a new synthetic Schiff base on mild steel corrosion in 1M HCl and 0.5 M H2SO4 was investigated using various electrochemical techniques (potentiodynamic polarization , AC impedance) and weight loss measurements. These measurements revealed that this Schiff base inhibited the corrosion of mild steel in both media and  was a mixed-type inhibitor. This inhibitor was adsorbed on the mild steel surface according to a Langmuir isotherm adsorption model. In both media, inhibition efficiency increased with increasing Schiff base concentration. The values of free energy of adsorption were calculated to investigate the mechanism of corrosion inhibition. Scanning electron microscopy (SEM) observation confirmed the existence of an absorbed protective film on the metal surface.                 Key Words:  Schiff-base, mild steel, AC impedance, corrosion                 inhibition, Langmuir isotherm.            

___

  • [1] Ali, S.A., Al-Muallem, H.A., Rahman, S.U., Saeed, M.T., “Bis-isoxazolidines: A new class of corrosion inhibitors of mild steel in acidic media”, Corros. Sci., 50: 3070 (2008 ).
  • [2] Shokry, H., Yuasa, M., Sekine,. I., Issa, R.M., ElBaradie, H.Y., Gomma,G.K., “Corrosion inhibition of mild steel by schiff base compounds in various aqueous solutions: part 1 ”, Corros. Sci., 40: 2173 (1998).
  • [3] Hong Ju, Zhen-Peng Kai, Yan Li.,“ Aminic nitrogen-bearing polydentate Schiff base compounds as corrosion inhibitors for iron in acidic media: A quantum chemical calculation ”, Corrosion Science, 50: 865 (2008)
  • [4] Samiento-Bustos,E., González Rodriguez,. J.G., Uruchurtu, G., “Effect of inorganic inhibitors on the corrosion behavior of 1018 carbon steel in the LiBr + ethylene glycol + H2O mixture”, Corrosion Science, 50: 2296 (2008).
  • [5] Guannan , Mu., Xianghong, Li., Qing, Qu., Zhou, Jun., “Molybdate and tungstate as corrosion inhibitors for cold rolling steel in hydrochloric acid solution ”, Corrosion Science, 48: 445 (2006).
  • [6] Moretti,G., Quartarone, G., Tassan, A., Zlngales,A., “5-Amino- and 5-chloro-indole as mild steel corrosion inhibitors in 1 N sulphuric acid”, Electrochimica Acta., 41: 1971, (1996).
  • [7] K.C.Emregul.,O.Atakol.,“Corrosion inhibition of iron in 1M HCl solution with schiff base compounds and derivatives”, Mater. Chem.Phys., 83: 373, (2004).
  • [8] Desimone, M.P., Grundmeier,G., Gordillo,G., Simison,S.N., “ Amphiphilic amido-amine as an effective corrosion inhibitor for mild steel exposed to CO2 saturated solution: Polarization, EIS and PMIRRAS studies ”, Electrochimica Acta, 56: 2990 ( 2011).
  • [9] Jafari, A.H., Hosseini, S.M.A., Jamalizadeh Emregul, E., Kurtaran, K.C., Atacol, o., “Investigation of Smart Nanocapsules Containing Inhibitors for Corrosion Protection of Copper”, 4 Electrochimica Acta, 55: 9004 (2010).
  • [10] ASTM, “Standard practice for laboratory immersion corrosion testing of metals”, G31-72, ASTM, 401 (1990).
  • [11] Kertit, S., Hammouti, B., “Corrosion inhibition of iron in 1M HCl by 1-phenyl-5-mercapto-1,2,3,4- tetrazole ” , Metallurgie-Cit, 251, (1998).
  • [12] Hosseini, M.G,, Mertens, S.F.L., Ghorbani, M,, Arshadi, M.R., “Effect of carbon steel microstructures and molecular structure of two new Schiff base compounds on inhibition performance in 1 M HCl solution by EIS ” , Mater. Chem.Phys, 2647 (2002).
  • [13] Behour, M.; Ghoreishi, S.M., Soltani, N., SalavatiNiasari, M., Hamadanian, M., Gandomi, A., “Electrochemical and theoretical investigation on the corrosion inhibition of mild steel by thiosalicylaldehyde derivatives in hydrochloric acid solution”, Corros.Sci., 50: 2172 (2008).
  • [14] Juttner, K., “Electrochemical impedance spectroscopy (EIS) of corrosion processes on inhomogeneous surfaces”, Electrochim.Acta, 35: 1501 (1990).
  • [15] Growcock, F.B., Jasinski, R.J., “Time-resolved impedance spectroscopy of mild steel in concentrated hydrochloric acid”, J. Electrolchem. Soc., 136, 2310 (1989).
  • [16] Quan, Z., Chen, S., Li, S., “Protection of copper corrosion by modification of self-assembled films of Schiff bases with alkanethiol”, Corros. Sci., 43: 1071 (2001 ).
  • [17] Bentiss, F., Traisnel, M., Lagrence, M., “The substituted 1,3,4-oxadiazoles: a new class of corrosion inhibitors of mild steel in acidic media ” , Corros. Sci., 42: 127 (2000).
  • [18] Quan, Z., Chen, S., Li, Y., and Cui, X., “Adsorption behaviour of Schiff base and corrosion protection of resulting films to copper substrate”, Corros.Sci., 44: 703 (2002).
  • [19] El Mehdi,B., Mernari, B., Traisnel, M., Bentiss, F., Lagrenee,M., “Synthesis and comparative study of the inhibitive effect of some new triazole derivatives towards corrosion of mild steel in hydrochloric acid solution”, Mater. Chem.Phys.,77: 489 (2002).
  • [20] Arshadi, M. R., Hosseni, M. G., Ghorbani, M., “Inhibition effect of 3,5 bis(2-pyridil)1,2,4 triazole and 1-10 phenantrolin on corrosion of mild steel in acid solutions” , J. British, 37(1): 76 (2002).
  • [21] D. Landot, Corrosion and Metals Surface Chemistry, Alden Press, Oxford, 495 (1993).
  • [22] Hosseini,m., Mertens,S.F.L., Ghorbani, M., ”Assimetrical Schiff base as inhibitors of mild steel corrosion in sulphuric acid media”, Mater. Chem.Phys.,78: 800 (2003).
  • [23] Foroulis, Z.A., Proceedings of the sixth European Symposium on Corrosion Inhibitors, 8: 130 (1985).
  • [24] Rengamani, S., Muralidharam, S., Anbu, M,. Kulandainathan, S., Venkatakrishna, I., “Inhibiting and accelerating effect of aminophenols on the corrosion and permeation of hydrogen through mild steel in acidic solutions”, J.Appl. Electrochem, 24: 355 (1994).
  • [25]Quraishi, M.A., Jamal, D., “Dianils as new and effective corrosion inhibitors for mild steel in acidic solutions”, Mater. Chem. Phys., 78: 608 (2003).
  • [26]Hegazy, M.A., “A novel Schiff base-based cationic gemini surfactants: Synthesis and effect on corrosion inhibition of carbon steel in hydrochloric acid solution”, Corros. Sci., 51: 2610 (2009 ).
  • [27] Dadgarinezhad. A.B.,” A new synthesized corrosion inhibitor for mild steel in 0.5 M H2SO4” , G.U.Journal of Science, 24: 219 (2011).