Chemical Information from GCMS and FTIR Studies on Ficus thonningii Gum and its Potential as a Corrosion Inhibitor for Aluminium in Acidic Medium (original) (raw)

Abstract

Chemical constituents and functional groups in Ficus thonningii gum was determined using GCMS and FTIR spectropho-tometer, respectively. The GCMS spectrum of Ficus thonningii gum showed the presence of useful organic chemicals. The gum is mildly acidic, tasteless, yellowish in colour, insoluble in chloroform and acetone but soluble in water and ethanol. Based on its chemical constituents, the corrosion inhibition potential of the gum was investigated and it was found that the gum acted as an adsorption inhibitor for the corrosion of aluminium in solution of HCl. The adsorption of the gum on the surface of aluminium is spontaneous, exothermic and proceeded through the initial mechanism of physical adsorption. Deviation of the adsorption of the gum from the ideal Langmuir adsorption isotherm and the nature of adsorption were accounted for by Frumkin, El Awardy and Dubinin-Radushkevich (D-RIM) adsorption isotherms. The study provides information on the physicochemical constituents of t...

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