Browsing by Author "Enenebaku, Conrad K."

Now showing 1 - 2 of 2
  • Thumbnail Image
    ItemOpen Access
    Application of aqueous extracts of coffee senna for control of mild steel corrosion in acidic environments
    (Springer, 2012-07-16) Akalezi, Chris O.; Enenebaku, Conrad K.; Oguzie, Emeka E.
    Background: The inhibitive effect of the aqueous extract of Coffee senna (CS) on the corrosion of mild steel in 1 MHCl and 0.5 M H2SO4 solutions was investigated by weight loss measurement as well as potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. Result: The extract was found to efficiently inhibit the corrosion process in both environments and inhibition efficiency increased with extract concentration as well as rise in temperature. Data from electrochemical measurements suggest that the extract functioned by adsorption of the organic matter on the metal/corrodent interface, inhibiting both the anodic and cathodic half reactions of the corrosion process. Adsorption of the extract organic matter was approximated by the Langmuir isotherm. The adsorption behavior of selected organicconstituents of the extract on the metal surface was assessed at the molecular level, in the framework of the density functional theory. Conclusion: This study clearly shows the potentials of CS extract for control of mild steel corrosion in acidic environment.
  • Thumbnail Image
    ItemOpen Access
    Inhibition of acid corrosion of mild steel by biomass extract from the petersianthus macrocarpus plant
    (U. P., 2013) Akalezi, Chris O.; Enenebaku, Conrad K.; Oguzie, Emeka E.
    Inhibitive action of petersianthus macrocarpus leave extract on corrosion of mild steel in 1M HCl and 0.5M H2SO4 solutions was studied using gravimetric, electrochemical impedance and potentiodynamic methods. The results indicated that the extracts functioned as a good inhibitor in both environments and inhibition efficiency increased with extract concentration. Temperature studies in the range 313-333K reveal increase in inhibition efficiency of the extract with rise in temperature. A mechanism of chemical adsorption on the extract components on the surface of the metal is proposed for the inhibition behavior. The adsorption characteristics of the inhibitor were found to obey Langmuir adsorption isotherm.