INHIBITION ACTION OF LAWSONE ON THE CORROSION OF MILD STEEL IN ACIDIC MEDIA

Abstract

The use of inhibitors is one of the most practical methods for protection against corrosion. Lawsone, 2-hydroxy-1,4-naphthoquinone, the main active ingredient of Henna (Lawsonia inermis) plantwas extracted, isolated and subjected to several studies. The corrosion inhibition of lawsone on the corrosion of mild steel in 1.0 M hydrochloric acid was studied using weight loss method. It was found that lawsone acts as a good corrosion inhibitor for mild steel in 1.0 M HCl medium. The inhibition efficiency increases with increasing of lawsone concentration. The inhibitive action was addressed in view of adsorption of lawsone molecules on the metal surface. It was found that this adsorption follows Langmuir adsorption isotherm in all tested systems and the adsorption is not activated

Keywords

• Corrosion inhibition, Hydrochloric acid, Mild steel, 2-hydroxy-1,4-napthoquinone

References

1. Ali, Sk.A.,Saeed, M.T and Rahman, S.U. (2003). The isoxazolidines: a new class of corrosion inhibitors of mild steel in acidic medium. Corros. Sci. 45, 253–266.
2. Berger, Sand Sicker. D (2009) Classics in spectroscopy: isolation and structure elucidation of natural products,
3. WILEY-VCH,Weinheim ± New York ± Chichester ± Brisbane ± Singapore ± Toronto Bhuvaeshwari, K.,Poongothai,S.G.,Kurvilla,A. and ,Raju,B.A., (2002) .Inhibitory Concentration of LawsoniaInermis
4. Dry powder for Urinary Pathogens,Indian J Pharmacol,34,260-263
5. El-Etre, A.Y., (1998).Natural honey as a corrosion inhibitor for metals and alloys. I. Copper in neutral aqueous solution, Corros. Sci. 40, 1845.
6. El-Etre, A.Y., (2001) Inhibition of acid corrosion of aluminum using vanillin, Corros. Sci. 43, 1031– 1039.
7. El-Etre, A.Y., (2003). Inhibition of aluminum corrosion using Opuntia extract, Corros. Sci. 45, 2485–2495.
8. Krishnaswamy, N.R., (2003). Chemistry of Natural Products,a Laboratory Handbook, India, Universities Press Private Limited.

9. Machnikova, E, Whitmire, K.H. and Hackerman, N., (2008). Corrosion inhibition of carbon steel in hydrochloric acid by furan derivatives, Electrochim. Acta, 53, 6024–6032.
10. Raja, P.B. and Sethuraman,M.G., ( 2008). Natural products as corrosion inhibitor for metals in corrosive media – a review, Mater. Lett.62 ,113–116.
11. Scattergood, G.L. Corrosion inhibitors for crude oil refineries, corrosion, ASM Handbook, vol. 13, ASM International, 1992.
12. Sekine, I. and Hirakawa, Y. (1986). Corrosion 42, 272.
13. Singh, I. and Singh, M. (1987). Corrosion 43, 425.
14. Shorky. H ,Yuasa.M, Sekine. I, Issa.R.M, El-Baradie.H.Y and Gomma, G.K, (1998). Corrosion inhibition of mild steel by schiff base compounds in various aqueous solutions: part 1, Corros. Sci. 40, 2173.
15. Thomson, R.H. (1970).Naturally Occurring Quinones, Academic Press, London, New York 1971.
16. Zhao, T.P. and Mu, G.N. (1999). Corrosion Science 41, 1937-1944.