Abstract

EDDY, N.O.; ODOEMELAM, S.A.; OGOKO, E.C.  and  ITA, B.I.. Adsorption and Inhibitive Properties of Lincomycin for the Corrosion of Zinc in 0.01 - 0.05 M H₂SO₄. Port. Electrochim. Acta [online]. 2010, vol.28, n.2, pp.73-85. ISSN 0872-1904.

Inhibition of the corrosion of zinc in various concentrations of H₂SO₄ by lincomycin was studied using weight loss and hydrogen evolution methods. The results obtained indicated that lincomycin is a good adsorption inhibitor for the corrosion of zinc in H₂SO₄ solutions. The inhibition efficiencies of lincomycin for the corrosion of zinc in H₂SO₄ were found to range from 70.90 to 80.32 %, 69.25 to 77.70 % and from 52.11 to 67.49 % at 303, 313 and 323 K, respectively. The inhibition efficiencies decreased with increase in temperature and with increasing concentration of H₂SO₄ but increased with increase in the concentration of lincomycin. The adsorption of lincomycin on Zn surface is endothermic, spontaneous and is best described by Langmuir adsorption isotherm.  Base on the trend in the variation of inhibition efficiency with temperature and the calculated values of the activation and free energies of adsorption, a physical adsorption mechanism is proposed for the adsorption of lincomycin on the surface of zinc.

Keywords : corrosion; inhibition; Zn; lincomycin.

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