American Journal of Materials Engineering and Technology
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American Journal of Materials Engineering and Technology. 2015, 3(2), 35-45
DOI: 10.12691/materials-3-2-3
Open AccessArticle

Inhibitive Performance of Bitter Leaf Root Extract on Mild Steel Corrosion in Sulphuric Acid Solution

Awe I. Caroline.1, Abdulrahaman A. S.1, , Ibrahim H. Kobe1, Kareem A. Ganiyu1 and Adams S. M2

1Department of Mechanical Engineering, School of Engineering and Engineering Technology, Minna, P.M.B. 65, Niger State, Nigeria

2Detartment of Metallurgical Engineering, Kogi State Polytechnique, Lokoja, Nigeria

Pub. Date: May 29, 2015

Cite this paper:
Awe I. Caroline., Abdulrahaman A. S., Ibrahim H. Kobe, Kareem A. Ganiyu and Adams S. M. Inhibitive Performance of Bitter Leaf Root Extract on Mild Steel Corrosion in Sulphuric Acid Solution. American Journal of Materials Engineering and Technology. 2015; 3(2):35-45. doi: 10.12691/materials-3-2-3


Cost of organic and some inorganic inhibitors are relatively low but many of the effective inhibitors such as chromate, arsenate and ethanolamine are very toxic, harmful to human health and their environment. The inhibitive ability of Bitter leaf (Vernonia amygdalina) root extract was investigated on corrosion of mild steel in 1.5 M Sulphuric acid solution using weight loss, hydrogen evolution and thermometric measurements at temperature ranges of 30-60°C. The root extract was characterized for phytochemical screening using Gas Chromatography Mass Spectroscopy (GCMS) and Fourier Transformation Infra-Red Spectroscopy (FTIS). The result showed the extracts contained some organic compounds which are responsible for the inhibitive ability. The corrosion rate of mild steel in the presence of inhibitors decreases and increase as the temperature increases. The inhibitor exhibit excellent inhibition efficiency on mild steel corrosion in H2SO4 solution as 90 %, 84.82 %, 79.65 % and 76.90 % of inhibition efficiency achieved with addition of 0.5 g/l concentration of bitter leaf root extract (BLRE) at 30°C, 40°C, 50°C and 60°C temperature respectively. The inhibition efficiency increase with in concentration of inhibitor and decreases with rise in temperature. The adsorption parameters also obeyed the Langmuir adsorption isotherm and the result of Gibbs free energy of adsorption (∆Gads) showed spontaneous process of adsorption that is consistent with physical adsorption mechanism.

bitter leaf root inhibitive performance physical adsorption and mild steel

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[1]  Ajani, K.C., Abdulrahman A.S., and Mudiare E., (2014). Inhibitory Action of Aqueous Citrus aurantifolia Seed Extract on the Corrosion of Mild Steel in H2SO4 Solution. World Applied Sciences Journal 31 (12): 2141-2147.
[2]  Asipita, S.A., M. Ismail, M.Z.A. Majid, Z.A. Majid, C.S. Abdullah and J. Mirza. 2014. Green Bambusa Arundinacea leaves extract as a sustainable corrosion inhibitor in steel reinforced concrete. Journal of Cleaner Production, 67: 139-146.
[3]  Obot, I.B., Umoren, S. A., Obi-Egbedi, N.O., (2011). Corrosion inhibition and adsorption behaviour for aluminuim by extract of Aningeria robusta in HCl solution: Synergistic effect of iodide ions. Journal of Materials and Environmental Science. 2 (1):60-71.
[4]  Umoren, S.A., Eduok, U.M., Solomon, M.M., Udoh A.P., (2011). Corrosion inhibition by leaves and stem extracts of Sida acuta for mild steel in 1M H2SO4 solutions investigated by chemical and spectroscopic techniques. Arabian journal of chemistry. Volume 3, page 008.
[5]  Ebenso E.E., Eddy N.O., Odiongenyi A.O., (2008). Corrosion inhibitive properties and adsorption behavior of ethanol extract of piper guinensis as a green corrosion inhibitor for mild steel in H2SO4. African Journal of Pure and Applied Chemistry. Volume 2, number 11, page 107-115.
[6]  Ituen E. B., and Udo,U. E.,Odozi N. W., and Dan, E. U., (2013). Adsorption and kinetic/thermodynamic characterization of aluminium corrosion inhibition in sulphuric acid by extract of Alstonia boonei. Applied Chemistry, issue 4, Volume 3, page 52-59.
[7]  Chauchan, L.R. and G. Gunasekaran, (2007). Corrosion inhibition of mild steel by plant extract in dilute HCL medium. Corros. Sci., 49: 1143.
[8]  Oguzie, E.E., Enenebeaku, C.K., Akalezi, C.O., Okoro, S.C., Ayuk,A.A., Ejike, E.N., (2010). Adsorption and corrosion-inhibiting effect of Dacryodis edulis extract on low-carbon-steel corrosion in acidic media. J. Colloid Interf. Sci. 349, 283-292.
[9]  Debi,G.E., H. Esah, I. Mohammed, A.S. Abdulrahman and M. Aminu, 2013. “Effect of Vernonia Amygdalina Extract on Corrosion Inhibition of Mild Steel in Simulated seawater. Australian Journal of basic and Applied Sciences. Volume 7, number 14, pp: 257-263.
[10]  Loto, C. A., (2003). The effect of bitter leaf on the inhibition of mild steel in HCl and H2SO4. Corrosion prevention and control Journal, 50: 43-49.
[11]  Loto, C. A., (1998). The effect of bitter leaf extracts on corrosion of mild steel in 0.5 M HCl and H2SO4 Solutions, Nigeria corrosion Journal international, 1:19-20.
[12]  Obiukwu, O. O., Opara, I. O., and Oyinna, B. C., 2013. Corrosion Inhibition of Stainless Steel Using Plant Extract Vernonia amygdalina and Azadirachta indica. The Pacific Journal of Science and Technology. Volume 14. Number 2. Page 31-35.
[13]  Ayeni, F. A., Madugu, I. A., Sukop, P., Ihom, A. P., Alabi, O. O., Okara, R., and Abdulwahab, M., 2012. Effect of aqueous extract of bitter leaf power on corrosion inhibition of Al-Si Alloy in 0.5 caustic Soda Solution. Journal of Minerals and Materials characterization and Engineering. Volume 11, page 667-670.
[14]  Noor, E. A., Al-Moubaraki, A. H., (2008). Thermodynamics of metal corrosion and inhibition adsorption process in mild steel/1-methyl-4[4’(-X)-styrylpyridiniumiodides/hydrochloric acid systems. Journal of Material Chemistry and Physics., Volume 110 page 145-154.
[15]  Nwoko, V.O and J.B. Lakeman. 2009. An Introduction to Aqueous Corrosion Theory. Corrosion Science and Engineering, FUTO: Nigeria.
[16]  Ajayi, O. M, Odusote, J. K., Yahya, R. A., (2013). Inhibition of mild steel corrosion using Jatropha curcas leaves extracts. Journal of electrochemistry science and engineering. doi: 10.5599/jese, 2014.0046.
[17]  Solomon, M. M., Umoren, S. A., Udosoro, I. I., Udoh, A. P., (2010). Inhibitive and adsorption behavior of carboxymethyl cellulose on mild steel corrosion in sulphuric acid solution. Corrosion science, Volume 52, page 1317-1325.
[18]  Oguzie, E. E., (2007). Corrosion inhibition of aluminium in acidic and alkaline media by Sansevieria trifasciata extract. Corrosion Science. Volume 49, number 3, page 1527
[19]  Amitha Rani, B. E., Bharathi Bai, J. B., (2012). Green inhibitors for protection of metals and alloys. International Journal of corrosion, volume 2012, page 15.
[20]  Leelavathi, S. Rajalakshmi R. J. (2013). Dodonaea viscosa (L.) Leaves extract as acid Corrosion inhibitor for mild Steel – A Green approach Materials Environmental Science. Volume 4, number 5, page. 625-638.
[21]  Evans, U. R., (1976). The Corrosion and Oxidation of Metals Hodder Arnold, 1976.
[22]  Doughari J. H., (2012). Phytochemical: Extraction Methods, Basic Structures and Mode of Action as Potential Chemotherapeutic Agents, Phytochemical - A Global Perspective of Their Role in Nutrition and Health, Dr Venketeshwer Rao (Ed.), ISBN:978-953-51-02960., from: phytochemicals-extraction methods-basic-structures-and-mode-of-action-as-potentialchemotherapeutic. [Accessed 3/11/2014]
[23]  Norr E.A., (2005). The inhibition of mild steel corrosion in phosphoric acid by some N-heterocyclic compound in the salt form. Corrosion Science, volume 47, page 33.
[24]  Oza, B.N., Singha, R.S., (1982). Thermometric study of corrosion behaviour of high strength Al-Mg alloy in phosphoric acid in presence of halides. Trans. SAEST, volume 17, page 281.
[25]  De Souza, F. S., and Spinelli, A., (2009). Cafeic acid as a green corrosion inhibitor for mild steel. Corrosion science. Volume 51, page 642-649.
[26]  Ameer, M.A., Fekry, A.M., (2011). Corrosion inhibition of mild steel by natural product compound. Progress in Organic Coatings. Volume 71, page 343-349.
[27]  Tebbji, K., Faska, N., Tounsi, A., Oudda, H., Benkaddour, M., Hammouti, B., 2007. The effect of some lactones as inhibitors for the corrosion of mild steel in 1M hydrochloric acid. Mater. Chem. Phys. 106, 260-267.
[28]  Seth T., Chaturved A., Updhyay R.K., M athur S.P. (2007). Corrosion inhibitory effects of some schiffs bases on mild steel in acidic media, Journal of chil. Chem. Soc. Volume 52 page 1206.
[29]  Ekanem, U.F., Umoren, S.A., Udousoro, I.I., Udoh, A.P., Inhibition of mild steel corrosion in HCl using pineapple leaves (Ananas comosus L.) extract. Journal of Materials Science 45 (2010) 5558.
[30]  Obot, I.B., Obi-Egbedi, N.O., Adsorption properties and inhibition of mild steel corrosion in sulphuric acid solution by ketoconazole: Experimental and theoretical investigation. Corrosion Science 52 (2010) 198
[31]  Zerga, B., Attayibat, A., Sfaira, M., Taleb, M., Hammouti, B., Ebn Touhami, M., Radi, S., Rais, Z., 2010. Effect of some tripodal bipyrazolic compounds on C38 steel corrosion in hydrochloric acid solution. Journal of Applied Electrochemistry.
[32]  Noor, E.A., 2009. Potential of aqueous extract of Hibiscus sabdariffa leaves for inhibiting the corrosion of aluminium in alkaline solutions. Journal of Applied Electrochemistry. 39, 1465-1475.
[33]  Prathibha, B. S., Kotteeswaran P., and Raju, V. B., Study on the inhibition of mild steel corrosion by N, N-dimethyl-N-(2-phenoxyethyl)dodecan-1-aminiumbromide in HCl mediun. IOSR Journal of Applied Chemistry.