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F. Zucchi and I. H. Omar, “Plant Extracts as Corrosion Inhibitors of Mild Steel in HCl Solution,” Surface Technology, Vol. 24, No. 4, 1985, pp. 391-399. doi:10.1016/0376-4583(85)90057-3

has been cited by the following article:

• TITLE: Adsorption and Thermodynamics Study of the Inhibition of Corrosion of Mild Steel In H2SO4 Medium Using Vernonia Amygdalina

  AUTHORS: Joseph Tagbo Nwabanne, Vincent Nwoye Okafor

  KEYWORDS: Adsorption; Corrosion; Mild Steel; Inhibition; Vernonia Amygdalina

  JOURNAL NAME: Journal of Minerals and Materials Characterization and Engineering, Vol.11 No.9, September 25, 2012

  ABSTRACT: In this work, adsorption and thermodynamics study of the inhibition of corrosion of mild steel in H2SO4 medium using Vernonia amygdalina was carried out. The inhibitive and adsorptive properties of ethanol extract of Vernonia amygdalina for the corrosion of mild steel in 0.2 M H2SO4 solutions was investigated using weight loss technique. The result has proved that that the extract is a good inhibitor of corrosion of mild steel in H2SO4. The inhibition efficiencies ranged from 23.37 to 38.59% and from 22.45 to 35.78% at 303 and 323K respectively. The inhibition efficiency of the extract decreased as temperature and time of immersion increased but increased with increase in concentration of extract. The adsorption of the inhibitor on surface of mild steel was found to be exothermic, spontaneous and consistent with the mechanism of physical adsorption as the value for heat of adsorption ranged from -2.12 to -4.87KJ mol–1. The adsorption data fitted well to Langmuir, Temkin, Frumkin and Flory-Huggins adsorption isotherms.