Inhibitive effect and adsorption study of Chromolena odorata and Aspilia africana as corrosion inhibition of zinc in 1 M H2SO4 solution

Authors

  • Emembolu, L. N Department of Chemical Engineering Nnamdi Azikiwe University, Awka
  • Onukwuli, O. D. Department of Chemical Engineering Nnamdi Azikiwe University, Awka

Keywords:

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

Abstract

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.

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Published

2020-01-01

Issue

Vol. 16 No. 1 (2020): Journal of Engineering and Applied Sciences

Section

Articles