Journal
ARABIAN JOURNAL OF CHEMISTRY
Volume 9, Issue -, Pages S1584-S1589Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.arabjc.2012.04.029
Keywords
Aluminium; Corrosion inhibition; Plant extract; Alkaline solution; Weight loss method
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Funding
- Council of Science and Industrial Research (CSIR), New Delhi, India
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The inhibiting action of Piper longum seed extracts was investigated as the corrosion inhibitors of aluminium in 1 MNaOH solution using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) methods, and weight loss measurements. The results revealed that P. longum extract was an effective inhibitor, and the inhibition efficiencies obtained from polarization and weight loss experiments were in good agreement. Using the potentiodynamic polarization technique, the extract was proving to have a mixed-type character for aluminium in alkaline solution by suppressing both anodic and cathodic reactions on the metal surface. The adsorption isotherm model was determined according to fitted results obtained from the weight loss experiments performed on the aluminium specimen in 1 M NaOH solution at 308 K. Thermodynamic parameters such as activation energy and free energy of adsorption were calculated and given in kJ mg(-1). (C) 2012 Production and hosting by Elsevier B.V.
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