Abstract

OBOT, I. B.  and  OBI-EGBEDI, N. O.. Ipomoea Involcrata as an Ecofriendly Inhibitor for Aluminium in Alkaline Medium. Port. Electrochim. Acta [online]. 2009, vol.27, n.4, pp.517-524. ISSN 0872-1904.

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_ads and ΔG_ads.

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

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