Abstract

OGOKO, E.C.; ODOEMELAM, S.A.; ITA, B.I.  and  EDDY, N.O.. Adsorption and Inhibitive Properties of Clarithromycin for the Corrosion of Zn in 0.01 to 0.05 M H₂SO₄. Port. Electrochim. Acta [online]. 2009, vol.27, n.6, pp.713-724. ISSN 0872-1904.

The corrosion of zinc in 0.01 to 0.04 M H₂SO₄ was studied using gravimetric and gasometric methods of monitoring corrosion. The results obtained indicate that clarithromycin is a good adsorption inhibitor for the corrosion of zinc in H₂SO₄. The inhibition efficiency of clarithromycin increases with increasing concentration but decreases with increasing temperature. There was no significant difference between the inhibition efficiencies of clarithromycin obtained at various concentrations of H₂SO₄ (P>0.5), but values of inhibition efficiency tend to decrease with increasing concentration of the acid. The adsorption of clarithromycin on zinc surface is endothermic, spontaneous and is best described by Langmuir adsorption isotherm. Calculated values of activation energies and free energies of adsorption indicate that the adsorption of clarithromycin on zinc surface supports the mechanism of physical adsorption.

Keywords : corrosion; inhibition; clarithromycin.

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