Title Inhibitive effect and adsorption study of Chromolena odorata and Aspilia africana as corrosion inhib
Journal International journal of Engineering And Applied Science
Publisher Faculty of Engineering, Nnamdi Azikiwe University, Awka Nigeria.
Issue 1
ISSN 1119-8109
Pages 108-116
Subject Chemical Engineering
Date of Publication January 01,2020

AUTHOR(S) Emembolu, L. N and Onukwuli, O. D


The inhibitive effect of Chromolena odorata and Aspilia africana as corrosion inhibitors for zinc in 1 M H2SO4 was examined using gravimetric method. The plant leaf extracts showed effective and good inhibitor for zinc in 1M H2SO4. From the results, Chromolena odorata and Aspilia africana retarded the corrosion of zinc in the acid medium. The inhibition efficiency of the plant extracts increase as the concentration increases and decrease as the temperature increases respectively. Aspilia africana showed better inhibition efficiency than Chromolena odorata in the same medium. The apparent activation energy (Ea), heat of adsorption (Qads) and free energy of adsorption (Gads) were determined. The value of Gads implies that the adsorption of inhibitor on the surface of zinc metal was spontaneous.

Keywords: Zinc, corrosion inhibition, utilization, Chromolena odorata, Aspilia africana.

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