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Inhibition of aluminium and mild steel corrosion in acidic medium using Gum Arabic

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Abstract

The corrosion behaviour of mild steel and aluminium exposed to H2SO4 solution and their inhibition in H2SO4 containing 0.1–0.5 g/L Gum Arabic (GA) used as inhibitor was studied at temperature range of 30–60 °C using weight loss and thermometric techniques. Corrosion rate increased both in the absence and presence of inhibitor with increase in temperature. Corrosion rate was also found to decrease in the presence of inhibitor compared to the free acid solution. Inhibition efficiency increases with increase in concentration of the inhibitor reaching a maximum of 37.88% at 60 °C for mild steel and 79.69% at 30 °C for aluminium at 0.5 g/L concentration of GA. The inhibitor, GA was found to obey Temkin and El-Awady et al. thermodynamic kinetic adsorption isotherm for mild steel and aluminium respectively from the fit of the experimental data at all concentrations and temperatures studied. The phenomenon of chemical adsorption is proposed for mild steel corrosion, while physical adsorption mechanism is proposed for aluminium corrosion. Results obtained for the kinetic/thermodynamic studies indicate that the adsorption of GA onto the metals surface was spontaneous. GA is a better corrosion inhibitor for aluminium than for mild steel.

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  1. Department of Chemistry, Faculty of Science, University of Uyo, P. O. Box 4271, UNIUYO Post Office, Uyo, Nigeria

    S. A. Umoren

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  1. S. A. Umoren
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Umoren, S.A. Inhibition of aluminium and mild steel corrosion in acidic medium using Gum Arabic. Cellulose 15, 751–761 (2008). https://doi.org/10.1007/s10570-008-9226-4

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  • DOI: https://doi.org/10.1007/s10570-008-9226-4

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