Amaranthus cordatus as a Green Corrosion Inhibitor for Mild Steel in H2SO4 and NaCl


This work studies the use of Amaranthus cordatus as the corrosion inhibitor for conventional mild steel in 0.5 M and 1.0 M of both H2SO4 and NaCl. The effects of different concentrations of the acid and base on the inhibition efficiency of Amaranthus cordatus were tested at room temperature and at different inhibitor volumes. The experiment was set for 30 days and weight-loss corrosion technique was employed in obtaining the corrosion penetration rate using the standard equation: . The result shows that the rates of corrosion of the mild steel increased with an increase in concentration of the acid or base and also decreased with increasing volume of Amaranthus cordatus. Expectedly, the inhibition efficiency was found to be greater in sodium chloride than in tetraoxosulphate VI acid. Also inhibition efficiency was found to increase with increase in extracts volume and decrease in concentration of the acid or base. These findings strongly suggest that Amaranthus cordatus can be used as the inhibitor for preventing the corrosion of mild steel.

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Nwankwo, M. , Offor, P. , Neife, S. , Oshionwu, L. and Idenyi, N. (2014) Amaranthus cordatus as a Green Corrosion Inhibitor for Mild Steel in H2SO4 and NaCl. Journal of Minerals and Materials Characterization and Engineering, 2, 194-199. doi: 10.4236/jmmce.2014.23024.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Sanyal, B. (1981) Progress in Organic Coatings. Journal of Chemica Acta, 9, 165-236.
[2] Hosary, A.A.E., Saleh, R.M. and I-Dahan, H.A.E. (1990) Corrosion Inhibitors. University of Ferrara Press, Ferrara, 725.
[3] Arab, S.T. and Noor, E.A. (1993) Inhibition of Acid Corrosion of Steel by Some S-Alkylisothiouronium Iodides. Corrosion Science, 49, 122-129.
[4] Okafor, P.C., Ebenso, E.E. and Ekpe, U.J. (2010) Azadirachta Indica Extracts as Corrosion Inhibitor for Mild Steel in Acidic Medium. International Journal of Electrochemical Science, 5, 978-984.
[5] Ali, S.A., Al-Muallem, H.A., Rahman, S.U. and Saeed, M.T. (2008) Hydrophobic-Tailed Bicycloisoxazolidines: A Comparative Study of the Newly Synthesized Compounds on the Inhibition of Mild Steel Corrosion in Hydrochloric and Sulfuric Acid Media. Corrosion Science, 50, 664-675.
[6] Ekuma, C.E., Idenyi, N.E. and Owate, I.O. (2010) Application of Statistical Technique to the Analysis of Passivation of Al-Zn Alloy Systems in Brine. Journal of Chemical Engineering and Materials Science, 1, 1-7.
[7] Anand, B. and Balasubramanian, V. (2011) Corrosion Behaviour of Mild Steel in Acidic Medium in Presence of Aqueous Extract of Allamanda blanchetii. E-Journal of Chemistry, 8, 226-230.
[8] Veawab, V., Totinwachuthikul, P. and Chakma, A. (2001) Investigation of Low-Toxic Corrosion Inhibitors for Carbon Dioxide Separation Process Using Aqueous MEA Solvent. Industrial and Engineering Chemistry Research, 40, 4771- 4777.
[9] Raja, B. and Sethuraman, M.G. (2008) Inhibitive Effect of Black Pepper Extract on the Sulphuric Acid Corrosion of Mild Steel. Materials Letter, 62, 113-116.
[10] Callister, W.D. (1997) Materials Science and Engineering: An Introduction. John Wiley and Sons Inc., New York, 520-534.
[11] Oguzie, E.E., Onuchukwu, A.I., Okafor, P.C. and Ebenso, E.E. (2006) Corrosion Inhibition and Adsorption Behaviour of Ocimum Basilicum Extracts on Aluminium. Pigment and Resin Technology, 35, 63-70.
[12] Oguzie, E.E. (2006) Studies on the Inhibitive Effects of Ocimum Viridis Extracts on the Acid Corrosion of Mild Steel. Materials Chemistry and Physics, 49, 4771-4777.
[13] Onuegbu, T.U., Umoh, E.T. and Onuigbo, U.A. (2013) Eupatorium Odoratum as Eco-Friendly Green Corrosion Inhibitor of Mild Steel in Sulphuric Acid. International Journal of Science & Technology Research, 2, 4-8.
[14] Olusegun, K., Abiola, O.K., Oforka, N.C. and Ebenso, E.E. (2004) The Inhibition of Mild Steel Corrosion in an Acidic Medium by Fruit Juice of Citrus Paradise. Journal of Corrosion Science and Technology, 5, 75-78.
[15] Gunasekaran, G. and Chauhan, L.R. (2004) Eco-Friendly Inhibitor for Corrosion Inhibition of Mild Steel in Phosphoric Acid. Electrochimica Acta, 49, 4387-4395.
[16] Ijomah, M.C.N. (1991) Elements of Corrosion and Protection Theory. Auto-Century Publishing Company Ltd., Enugu.

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