Gmelina Arborea Bark Extracts as a Corrosion Inhibitor for Mild Steel in an Acidic Environment
作者： Uche Ihekoronye , Kings O. Uchendu , Francis O. Nwosu , Eti P. Eti , Lebe A. Nnanna
DOI:
关键词: Botany 、 Physisorption 、 Freundlich equation 、 Corrosion 、 Adsorption 、 Langmuir adsorption model 、 Corrosion inhibitor 、 Langmuir 、 Chemisorption 、 Chemistry 、 Nuclear chemistry
摘要: This paper describes the gravimetric analysis on acidic corrosion of mild steel in presence different concentrations Gmelina arborea bark extract at room temperature. G. lowered rate from about 0.6mm/yr to as low 0.04mm/yr, which brought very high inhibition efficiency values 94% an optimum value 96% after 40 hours exposure. The mechanism adsorption was investigated using Langmuir, Temkin and Freundlich isotherms. A mixed (physisorption chemisorption) proposed. Adherence inhibitor metal surface spontaneous given negative Gibb’s free energy adsorption. Langmuir isotherm confirmed that physisorption occurred but showed more chemisorption occurrence than physisorption.
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