Ipomoea Involcrata as an Ecofriendly Inhibitor for Aluminium in Alkaline Medium

I. B. Obot^{1 *} N. O. Obi-Egbedi²

¹ Department of Chemistry, Faculty of Science, University of Uyo, Uyo, Nigeria

²Department of Chemistry, University of Ibadan, Ibadan, Nigeria

 

Received March 2009; accepted 12 July 2009

 

Abstract

The corrosion inhibition of aluminium by Ipomoea involcrata (IP) in 1 M NaOH was rapidly assessed using the gasometric technique at 30 and 60 ^oC . Results obtained showed that Ipomoea involcrata acts as an inhibitor for aluminium corrosion in 1 M NaOH. Inhibition efficiency increased with increase in concentration of IP up to 55.0 % at 50 v/v% and decreased with increase in temperature. The adsorption of IP was in accord with Langmuir adsorption isotherm at the studied temperatures. A mechanism of physical adsorption is proposed from the calculated values of E_a ,Q_adsand ΔG_ads.

Keywords : Ipomoea involcrata, aluminium, corrosion, inhibition, adsorption isotherm, thermodynamics.

 

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^*Corresponding author. E-mail adress: proffoime@yahoo.com