Abstract
Three heterocyclic compounds namely 3-anilino-5-imino-4-phenyl-1, 2,4-thiadiazoline (AIPT), 3-anilino-5-imino-4-tolyl-1, 2,4-thiadiazoline (AITT), and 3-anilino-5-imino-4-chlorophenyl-1, 2,4-thiadiazoline (AICT) were synthesized and their influence on the inhibition of corrosion of mild steel in 1 M HCl and 0.5 M H2SO4 was investigated by weight loss and potentiodynamic polarization techniques. The values of activation energy and free energy of adsorption of these compounds were also calculated. Potentiodynamic polarization studies were carried out at room temperature, and showed that all the compounds were mixed type inhibitors causing blocking of active sites on the metal. The inhibition efficiency of the compounds was found to vary with concentration, temperature and immersion time. Good inhibition efficiency was evidenced in both acid solutions. The adsorption of the compounds on mild steel for both acids was found to obey the Langmuir adsorption isotherm. Electrochemical impedance spectroscopy was also used to investigate the mechanism of corrosion inhibition.
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References
S.L. Granese, B.M. Rosales, C. Oviedo and J.O. Zerbino, Corros Sci. 33 (1992) 1439.
G. Subramanium, K. Balasuramanium and P. Shridhar, Corros. Sci. 30 (1990) 1019.
S.N. Banerjee and S. Mishra, Corrosion 45 (1989) 780.
S. Hettiarachchi, Y.W. Chain, R.B. Wilson Jr and V.S. Agarwala, Corrosion 45 (1989) 30.
C.R. Anderson and G.M. Schmid, Corros. Sci. 24 (1984) 325.
E. Stupnisek-Lisac, M. Meticos-Hukovic, D. Lencic, J. Vorkapic-Furac and K. Berkovic, Corrosion 48 (1992) 924.
E. Stupnisek-Lisac, K. Berkovic and J. Vorakapic-Furac, Corros. Sci. 12 (1988) 1189.
S.N. Raicheva, B.V. Aleksiev and E.J. Sokolov, Corros. Sci. 34 (1993) 343.
M. Ajmal, A.S. Mideen and M.A. Quraishi, Corros Sci. 36 (1994) 178.
M.A. Quraishi, M.A.W. Khan, M. Ajmal and S. Muralidharan, Portg Electrochem. Acta. 13 (1995) 63.
M.A. Quraishi, M.A.W. Khan, M. Ajmal, S. Muralidharan and S.V. Iyer, AntiCorros. Meth. Mater. 43 (1996) 5.
M.A. Quraishi, M.A.W. Khan, M. Ajmal, S. Muralidharan and S.V. Iyer, J. Appl Electrochem. 26 (1996) 1253.
M.A. Quraishi, M.A.W. Khan, M. Ajmal, S. Muralidharan and S.V. Iyer, Br. Corros. J. 32 (1997) 72.
M.A. Quraishi, M.A.W. Khan, M. Ajmal, S. Muralidharan and S.V. Iyer, Corrosion 53 (1997) 475.
ASTM (American Society for Testing and Materials), 'Metal Corrosion, Erosion and Wear, (Annual Book of ASTM standards 1987) 0.3.02,G1-72.
A.R. Butler, C. Glidewell, I. Hussain and P.R. Maw. J. Chem. Res. 1980, (S) 114; (M) 1843.
M. Schorr and J. Yahalom, Corros. Sci. 12 (1972) 867.
R.T. Vashi and V.A. Champaneri, Ind. J. Chem. Technol. 4 (1997) 180.
I.N. Putilova, S.A. Balezin and U.P. Baranik, 'Metallic Corrosion Inhibitors (Pergamon Press, New York, 1960), p. 31.
M. Elachouri, M.S. Hajji, M. Salem, S. Kertit, J. Aride, R. Coudert and E. Essassi, Corrosion 52 (1996) 103.
B.V. Savithri and S. Mayanna, Ind. J. Chem. Technol. 3 (1996) 256.
N. Al-Andis, E. Khamis, A. Al-Mayouf and H. Aboul-Enein, Corros. Prevent. Control 42 (1995) 13.
I. Singh, Corrosion 49 (1993) 473.
K. Juttner, Electrochim. Acta 35 (1990) 1501.
S.T. Hirozawa, Proceedings of 8th European Symposium on 'Corrosion Inhibition', Ann Univ. Ferrara, Italy (1995), p. 25.
N.C. Subramaniyam and S. Mayanna, Corros. Sci. 25 (1985) 163.
M.A. Quraishi, A.S. Mideen, M.A. Wajid Khan and M. Ajmal, Ind. J. Chem. Tech. 1 (1994) 329.
Z. Szklarska-Smialowska and M. Kamiski, Proc. 5th International Congress of Metal Corrosion, Tokyo, Japan (1972) 553.
A.G. Gad-Allah, M.M. Abou-Romia and H.H. Rehan, Ind. J. Technol. 30 (1992) 252.
M.A. Quraishi, M.A.W. Khan, M. Ajmal, S. Muralidharan and S.V. Iyer, J. Appl. Electrochem. 26 (1996) 1253.
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Quraishi, M., Sardar, R. Hector bases – a new class of heterocyclic corrosion inhibitors for mild steel in acid solutions. Journal of Applied Electrochemistry 33, 1163–1168 (2003). https://doi.org/10.1023/B:JACH.0000003865.08986.fb
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DOI: https://doi.org/10.1023/B:JACH.0000003865.08986.fb