Cnestis ferruginea as eco-friendly corrosion inhibitor of mild steel in corrosive environment

N.E. Ibisi, and V. I. Uwakwue

Abstract

 

Accepted 28^th July, 2015

 

Cnestis ferruginea leaves extract was studied as corrosion inhibitor for mild steel in 1MHCl at temperatures 30⁰C and 45⁰C using gravimetric and gasometric techniques. C. ferruginea leaves extract was found to inhibit corrosion of mild steel in acid medium. The inhibition efficiency increased as concentration of C. ferruginea extract increased but decreased with rise in temperature suggesting physical adsorption of the extract on mild steel surface. The calculated values of apparent activation energy, free energy of adsorption and heat of adsorption confirmed the physisorption mechanism. The inhibitor adsorption characteristics were approximated by the Langmuir isotherm.

 

Keywords: Cnestis ferruginea, eco-friendly inhibitor, gasometric techniques, mild steel

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