Physicochemical Study and Corrosion Inhibition Potential of Ficus tricopoda for Aluminium in Acidic Medium
| Autor: | M.Y. Gwarzo, Paul Ocheje Ameh, I.J. Okopand, S.N. Dodo, Nnabuk Okon Eddy |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
corrosion
Langmuir adsorption model Ficus tricopoda gum Endothermic process inhibition Corrosion chemistry.chemical_compound symbols.namesake Adsorption chemistry aluminum Electrochemistry symbols Camphene Organic chemistry Gas chromatography Fourier transform infrared spectroscopy Solubility Nuclear chemistry |
| Zdroj: | Portugaliae Electrochimica Acta, Volume: 31, Issue: 2, Pages: 79-93, Published: MAR 2013 Portugaliae Electrochimica Acta v.31 n.2 2013 Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) Agência para a Sociedade do Conhecimento (UMIC)-FCT-Sociedade da Informação instacron:RCAAP |
| Popis: | Gas chromatography mass spectrophotometer (GCMS) analysis of Ficus tricopoda gum indicated the presence of 4.75, 56.15, 32.10 and 7.00 % of camphene, sucrose, 2methylene cholestan-3-ol and 7-hexadecenal, respectively. Several stretching and bending vibrations were observed in the Fourier transformed infra-red (FTIR) spectrum of the gum. Physicochemical examinations of the gum revealed that it is pale yellow in colour, mildly acidic, ionic and display characteristics of sour taste. The solubility of the gum in water was found to increase with increase in temperature. Knowledge of the chemical constitution of the gum (hence chemical structures of its constituents) was useful in predicting the corrosion inhibition potential of Ficus tricopoda (FT) gum. Consequently, the gum was found to be a good adsorption inhibitor for the corrosion of aluminum in solution of H 2SO 4. The adsorption of the gum (which, followed first order kinetic) was found to be endothermic at FT gum critical concentration of 0.3 g/L and exothermic at concentrations above the critical limit. The short coming of the Langmuir adsorption model in describing the existent of interaction between the molecules of the gum was complimented by the Frumkin and Dubinin-Radushkevich adsorption models. Calculated values of activation and free energies of activation indicated that the adsorption of Ficus tricopoda gum on Al surface exhibited both physical and chemical adsorption mechanism. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|