Adsorption and Thermodynamics Study of the Inhibition of Corrosion of Mild Steel In H₂SO₄Medium Using <i>Vernonia Amygdalina</i>  

作　　者：Joseph Tagbo Nwabanne Vincent Nwoye Okafor 

机构地区：[1]Department of Chemical Engineering, Nnamdi Azikiwe University, PMB 5025, Awka, Nigeria

出　　处：《Journal of Minerals and Materials Characterization and Engineering》2012年第9期885-890,共6页矿物质和材料特性和工程（英文）

摘　　要：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.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.

关 键 词：ADSORPTION CORROSION Mild Steel INHIBITION VERNONIA Amygdalina 

分 类 号：R73[医药卫生—肿瘤]