Natural Polymer of Iraqi Apricot Tree Gum as a Novel Corrosion Inhibitor for Mild Steel in 1 M HCl Solution
Autor: | Fouad Kadhim Mahdi, I. M. Alwaan |
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Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: |
Langmuir
Article Subject General Chemical Engineering Enthalpy 02 engineering and technology 010402 general chemistry 01 natural sciences Corrosion Corrosion inhibitor chemistry.chemical_compound symbols.namesake Adsorption Chemical engineering Organic chemistry Freundlich equation chemistry.chemical_classification Chemistry technology industry and agriculture Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Gibbs free energy symbols TP155-156 0210 nano-technology Nuclear chemistry |
Zdroj: | International Journal of Chemical Engineering, Vol 2016 (2016) |
ISSN: | 1687-806X |
DOI: | 10.1155/2016/5706432 |
Popis: | Corrosion inhibition of mild steel in 1 M hydrochloric acid using Iraqi apricot tree gum Arabic as natural polymer was studied. The weight loss method was used to predict the efficiency of the inhibitor on corrosion of mild steel in a temperature range of 17–40°C. The FTIR result of natural polymer revealed that the C=O and O-H groups were found in the structure of the natural polymer. The results of weight loss method showed that the inhibition efficiency (I%) increased with the increase in both the natural polymer concentration and the temperature; therefore, chemical adsorption mechanism was suggested in this system. The different mathematical models of the adsorption isotherms were studied and the results revealed that natural polymer was found to obey Temkin, Langmuir, and Freundlich adsorption isotherm. The activation energy of adsorption, enthalpy of adsorption, and entropy of adsorption were obtained for different concentrations of natural polymer (0, 0.1, 0.2, and 0.3 g/L) and the results showed that the thermodynamic properties decreased with the loading of a natural polymer. Gibbs free energy of adsorption results was a minus value that led to the conclusion of the spontaneous adsorption of the natural polymer in this system. |
Databáze: | OpenAIRE |
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