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      Eco-friendly Inhibitors from Naturally Occurring Exudate Gums for Aluminium Corrosion Inhibition in Acidic Medium

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          Abstract

          Exudates gums from Pachylobus edulis (PE) and Raphia hookeri (RH) were evaluated as corrosion inhibitors for aluminium in HCl using weight loss and thermometric measurements at 30 - 60 ºC. The exudates were found to retard corrosion rate of aluminium. The inhibition efficiency (%1) increased with increase in concentration of the exudates. Increase in temperature increased the corrosion rate in the absence and presence of inhibitors but decreased the inhibition efficiency. Both PE and RH exudate gums were found to obey Temkin adsorption isotherm and Kinetic-Thermodynamic Model of El-Awady et al. at all the concentrations and temperatures studied. Phenomenon of physical adsorption is proposed from the activation parameters obtained. Thermodynamic parameters reveal that the adsorption process is spontaneous. Exudate gum from RH was found to be a better inhibitor than PE.

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          Corros. Sci.

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            Author and article information

            Contributors
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Journal
            pea
            Portugaliae Electrochimica Acta
            Port. Electrochim. Acta
            Sociedade Portuguesa de Electroquímica (Coimbra )
            0872-1904
            2008
            : 26
            : 3
            : 267-282
            Affiliations
            [1 ] University of Uyo Nigeria
            [2 ] University of Calabar Nigeria
            [3 ] NATIONAL UNIVERSITY OF LESOTHO Lesotho
            Article
            S0872-19042008000300003
            Product
            Product Information: website
            Categories
            ELECTROCHEMISTRY

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