Evaluation of the Corrosion inhibition Effects of Chrysophyllum albidum Extracts on Mild Steel
Offurum F. C. & Offurum J. C.
Department of Environmental Technology, Federal University of Technology, Owerri
Department of Chemical Engineering, Imo State Polytechnic, Umuagwo-Ohaji
Email: jullyengine@yahoo.com
Corresponding Author: Offurum J. C.
ABSTRACT
The inhibiting action of the Chrysophyllum albidum (CA) extract (leave and bark) on mild steel corrosion in 1M HCl and 0.5M H2SO4 solution was studied using gravimetric, and potentiodynamic polarization (PDP), techniques. The experimental results showed that CA leave and bark functioned as an inhibitor in the acidic corrodent and inhibition efficiency increased with increase in extract concentration. The CA leaf extract showed higher inhibition efficiency in 0.5M H2SO4 (94%) than in 0.5M H2SO4 (73%) bark extract; also,92% efficiency was observed in 1M HCl for CA bark extract, while 84% in 1M HCl leaf extract. Also, during the gravimetric chart, inhibition efficiency increased when metals are not withdrawn than in solutions with daily withdrawal of metal specimens. This was traceable to the fact that the metal surface already formed a thick film with the inhibitor, blocking the active corrosion sites on the surface, thereby reducing the corrosion rate (adsorption). Cathodic and anodic polarization curves showed that CA bark and leaf functioned as a mixed-type inhibitor. The study generally, indicates clearly that Chrysophyllum albidum extract has potentials of inhibiting corrosion of mild steel in acidic environment.
Keywords: Evaluation, Corrosion Inhibition, Effects, Chrysophyllum albidum, Mild Steel
