Adsorption and Inhibitive Properties of Clarithromycin for the Corrosion of Zn in 0.01 to 0.05 M H₂SO₄

 

E.C. Ogoko,¹ S.A. Odoemelam,¹ B.I. Ita,² N.O. Eddy^3,*

 

¹ Department of Chemistry, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria

² Department of Chemistry, University of Calabar, Calabar, Cross River State, Nigeria

³ Department of Chemistry, Ahmadu Bello University, Zaria, Kaduna State, Nigeria

 

Received 30 May 2009; accepted 28 October 2009

Abstract

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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^* Corresponding author. E-mail address: nabukeddy@yahoo.com