International Journal of Materials Chemistry and Physics
Articles Information
International Journal of Materials Chemistry and Physics, Vol.1, No.3, Dec. 2015, Pub. Date: Oct. 19, 2015
Corrosion Inhibition and Adsorption Studies of Ethanol Extract of Senna alata for Mild Steel in 2.0M H2SO4 Solution
Pages: 295-299 Views: 2549 Downloads: 1395
Authors
[01] I. M. Iloamaeke, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria.
[02] C. I. Egwuatu, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria.
[03] U. C. Umeobika, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria.
[04] H. Edike, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria.
[05] E. C. Ohaekenyem, Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria.
Abstract
Senna alata leaves extract was used as corrosion inhibitor of mild steel in 2.0M H2SO4 solution at 30°C and at 60°C using weight loss method. The result obtained showed that at 30°C the inhibition efficiency was 71.86% and 66.52% at 60°C. The corrosion rate of mild steel increases from 0.5M to 2.0M of H2SO4 and decreases from 0.1g/l to 0.5g/l of the ethanol extract of Senna alata. The calculated ∆E, ∆G, and ∆H indicated that the adsorption of ethanol extract of Senna alata was by Physical adsorption. Also adsorption of Senna alata leaves extract on the surface of the mild steel follows Langmuir, and Freundlich adsorption isotherms.
Keywords
Corrosion, Inhibition, Mild Steel, Senna alata
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