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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 56, Number 2
JKCSEZ 56(2)
April 20, 2012 

Corrosion Inhibition of Aluminium using 3-Hydroxy flavone in the Presence of Quarternary Ammonium Salts in NaOH Medium
J Morris Princey, Prabavathi Nagarajan
3-Hydroxyflavone (3HF), Quarternary ammonium salts, Aluminium, Electrochemical measurements, Synergism
The anticorrosive effect of 3-Hydroxyflavone (3HF) in combination with quarternary ammonium bromide and iodide salts (QAB and QAI) for aluminium corrosion in NaOH medium was studied at the temperature range of 303K- 323K using weight loss study, potentiodynamic polarization study and impedance spectroscopic measurements. The results revealed that the inhibition efficiency increases with the inhibitor concentration and it further increases on the addition of quarternary ammonium bromide and iodide salts. The enhanced inhibition efficiency of the inhibitor in the presence of quarternary ammonium salts may be due to synergistic effect. The adsorption process of 3HF on the aluminium surface obeys Langmuir’s adsorption isotherm. The mechanism of adsorption is further supported by Scanning Electron Microscopic study (SEM).
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