The Effect of Temperature on the Corrosion Inhibition of Mild Steel in 1 M HCl Solution by Curcuma Longa Extract
Nurul Izni KairiMaterials and Corrosion Chemistry Laboratory, School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, MalaysiaJain KassimMaterials and Corrosion Chemistry Laboratory, School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia
2013en
ABI
Abstract
The corrosion inhibition mechanism of the Curcuma longa extract on mild steel surface in 1 M HCl has been studied at different temperatures (30-55 o C) by gravimetric measurements. The inhibition efficiency decreases with increasing temperature. As the concentration of the extract increased, higher activation energy, enthalphy of activation and entropy of activation were obtained. The inhibition were physisorption in nature with an endothermic reaction. The adsorption process was more favoured at lower temperatures with larger negative standard free energy. The adsorption process on the mild steel surface obeys the Langmuir adsorption isotherm.
Identifiers
Citations and references
Cited by 20 references