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6.
Adsorption and
Inhibitive Properties of Norfloxacin for Mild Steel Corrosion in H2SO4
N. O. Eddy1
and S. A. Odoemelam2
1Physical Chemistry Unit, Department of Chemistry Ahmadu Bello
University, Zaria , Kaduna State, Nigeria
2Department of Chemistry, Michael Okpara University of Agriculture,
Umudike, Abia State.
Email:
nabukeddy@yahoo.com
Abstract:
Adsorption and inhibitive characteristics of norfloxacin for mild
steel corrosion have been studied using gasometric and thermometric
techniques. Norfloxacin is a good inhibitor for the corrosion of
mild steel in H2SO4. Inhibition efficiency of
norfloxacin ranged from 36.84 to 89.47% and from 23.29 to 61.92% at
303 and 333K, respectively. The inhibition efficiency of this
inhibitor tends to decrease with increase in temperature but
increases with its concentration. Thermodynamic/adsorption
considerations revealed that the adsorption of norfloxacin on the
surface of mild steel is endothermic, spontaneous and proceeded via
the mechanism of physical adsorption. Classical adsorption
isotherms of Langmuir, Frumkin and Freundlich have been used to
describe the adsorption characteristics of norfloxacin on mild steel
surface. The authors proposed that norfloxacin protects mild steel
from corrosion through the formation of Fe-norfloxacin complete.
Key word:
Corrosion, inhibition, norfloxacin.
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