• image 01
    Volume 1, No.1, 2012
  • image 02
    Volume 1, No.2, 2012
  • image 01
    Volume 1, No.3, 2012
  • image 02
    Volume 2, No.1, 2013
  • image 02
    Volume 2, No.2, 2013
  • image 02
    Volume 2, No.S1, 2013
  • image 02
    Volume 2, No.3, 2013
  • image 02
    Volume 2, No.4, 2013
  • image 02
    Volume 3, No.1, 2014
  • image 02
    Volume 3, No.2, 2014
  • Volume 3, No3
    Volume 3, No.3, 2014
  • Volume 3, No4
    Volume 3, No.4, 2014
  • Volume 4, No1
    Volume 4, No.1, 2015
  • Volume 4, No2
    Volume 4, No.2, 2015
  • Volume 4, No3
    Volume 4, No.3, 2015
  • Volume 4, No4
    Volume 4, No.4, 2015
  • Volume 5, No1
    Volume 5, No.1, 2016
  • image 01
  • image 02
  • Login|Register
  • Chem Sci Trans., 2015, 4(2),  pp 503-515  

    DOI:10.7598/cst2015.971

    Research Article

    Inhibitive Effect of Dirithromycin on the Corrosion of Zinc in Tetraoxosulphate(VI) Acid Medium

  • EMEKA OGOKO1 and ABIMBOLA OGUNSIPE 2 *
  • 1 Department of Chemistry, National Open University of Nigeria, Lagos, Nigeria
    2 Department of Chemistry, Federal University of Petroleum Resources, Effurun, Nigeria
  • Abstract

    The inhibitive effect by dirithromycin, an antibacterial drug, on the corrosion of zinc has been investigated using weight loss method. The results obtained indicate that clindamycin inhibits zinc corrosion in tetraoxosulphate(VI) acid (0.01 to 0.04 M) media. The inhibition efficiency increased with increasing inhibitor’s concentration. Kinetic, thermodynamic and adsorption parameters were determined and discussed. The uninhibited corrosion of zinc followed first order kinetics; while the presence of dirithromycin increased the enthalpy of activation, Δ H and therefore made corrosion less probable. The calculated Δ G values for the corrosion processes were positive, but increased in the presence of dirithromycin, suggesting that the activated complex was rather unstable. The adsorption of dirithromycin on zinc surface was exothermic, spontaneous and was best described by Langmuir adsorption isotherm. The calculated values of activation energies and free energies of adsorption indicate that the adsorption process supports the mechanism of physical absorption.

    Keywords

    Adsorption, Corrosion kinetics, Inhibition, Dirithromycin, Inhibition Efficiency, Activation thermodynamics

    This article has been viwed 1087 times

      

    Citations for this article 0

      

    No Citations