Acta Metallurgica Sinica (English Letters) >
Effect of Morinda Tinctoria Leaves Extract on the Corrosion Inhibition of Mild Steel in Acid Medium
Received date: 2012-11-19
Revised date: 2013-01-09
Online published: 2013-05-06
The Morinda tinctoria (MT) plant leaves extract was prepared in aqueous and hydrochloric acid media and was used as corrosion inhibitor for mild steel in hydrochloric acid medium. MT is found to be an efficient inhibitor at room temperature and the efficiency decreases with increase in temperature. Results from colorimetric studies predict the amount of iron present in the test solution and the percentage inhibition efficiency values calculated from this data fit well with the weight loss experiments. The AC impedance studies reveal that the mild steel surface is positively charged and the process of inhibition is through charge transfer. Polarisation studies indicate the mixed nature of the inhibitor. Thermodynamic parameters obtained predict that the process of inhibition is a spontaneous one.
Key words： Acid solution; Mild steel; Colorimetry; Electrochemicaltechnique; Corrosion
K. Krishnaveni , J.Ravichandran , A. Selvaraj . Effect of Morinda Tinctoria Leaves Extract on the Corrosion Inhibition of Mild Steel in Acid Medium[J]. Acta Metallurgica Sinica (English Letters), 2013 , 26(3) : 321 -327 . DOI: 10.1007/s40195-012-0219-9
[1] A.Y. El-Etre, Mater. Chem. Phys. 108 (2008)278.
[2] R.M. Saleh, A.A. Ismail and A.G. El Hosary, Corros.Sci. 23 (1983) 1239.
[3] E.A. Noor, Int. J. Electrochem. Sci. 2 (2007)996.
[4] G.O. Avwiri and F.O. Igho, Mater. Lett. 57 (2003) 3705.
[5] X.H. Li and S.D. Deng, Corros. Sci. 55 (2012)407.
[6] S.D. Deng and X.H. Li, Corros. Sci. 64 (2012)253.
[7] A.I. Ali and N. Foaud, J. Mater. Environ. Sci. 3(5) (2012) 917.
[8] E.E. Oguzie, Corros. Sci. 49 (2007) 1527.
[9] S.A. Umoren, Cellulose. 15 (2008) 751.
[10] P.C. Okafor, M.E. Ikpi, I.E. Uwah, E.E. Ebenso, U.J.Ekpe and S.A. Umoren, Corros. Sci. 50 (2008) 1879.
[11] E.E. Oguzie, Mater. Chem. Phys. 99 (2006) 441.
[12] P.B. Raja and M.G. Sethuraman, Mater. Lett. 62 (2008) 2977.
[13] G. Gunasekaran and L.R. Chauhan, Electrochim. Acta. 49 (2004) 4387.
[14] A.M. Abdel-Gaber, B.A. Abd El-Nabey, I.M. Sidahmed,A.M. El-Zayady and M. Saadawy, Corros. Sci. 48 (2006) 2765.
[15] G. Shanthi, D. Saridha and V. Mariappan, Int. J. Pharm.Pharm. Sci. 4(2) (2012) 636.
[16] S.A. Umoren, I.B. Obot, E.E. Ebenso and N.O.Obi-Egbedi, Desalination. 250 (2009) 225.
[17] I.B. Obot and N.O. Obi-Egbedi, Corros. Sci. 52(2010) 282.
[18] G.K. Gomma, Mater. Chem. Phys. 55 (1998) 241.
[19] Y. Harek and L. Larabi, Kem. Ind. 53(2) (2004)55.
[20] E.E. Oguzie, Mater. Chem. Phys. 87 (2004) 212.
[21] H. Ashassi-Sorkhabi, B. Shaabani and D. Seifzadeh,Appl. Surf. Sci. 239 (2005) 154.
[22] I.B. Obot and N.O. Obi-Egbedi, Corros. Sci. 52(2010) 198.
[23] Kotz, Treichel, Townsend, General Chemistry, Third Indian Reprint 2011, Indian edn., Cengage Learning India Private Limited, New Delhi, p.669.
[24] D. Ebbing and S.D. Gammon, Fundamentals of Chemistry,First Indian Reprint 2009, Cengage Learning India Private Limited,New Delhi, p.647.
[25] P.W. Atkins, Physical Chemistry, Sixth ed., Oxford University Press, 1998, p.857.
[26] Kirti Singh, World Noni Research Foundation, Int. J.Noni Res. Vol-2, No.1-2, Jan-July, 2007, p.17-19, 22.
[27] Jag Mohan, Organic Spectroscopy Principles and Applications, 2nd Ed., Narosa Publishing House, India, 2002, p. 76.
[28] R. Jasinski and A. Lob, J. Electrochem. Soc. 135(1988) 551.
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