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Portugaliae Electrochimica Acta
versão impressa ISSN 0872-1904
Port. Electrochim. Acta v.25 n.2 Coimbra 2007
Corrosion Inhibition of Mild Steel by Using Cetyl Pyridinium Bromide (CPB)
A.K. Dubeya,* and G. Singhb
a Polymer and Soft Material Section (PSMS), National Physical Laboratory (NPL),Dr. K.S. Krishnan Marg, New Delhi-110012, India
b Corrosion Research Laboratory, Department of Chemistry, University of Delhi-110007, India
Received 12 January 2006; accepted 29 September 2006
Abstract
The corrosion inhibition of mild steel in one normal sulphuric acid solution by CPB has been studied in relation to the concentration of the inhibitor as well as the temperature using electrochemical polarization (galvanostatic and potentiostatic) techniques. The results were supplemented with scanning electron microscopy and infra-red spectroscopy. All the methods employed are in reasonable agreement. There is no particular relationship of inhibition with concentration and temperatures. The thermodynamic functions of dissolution and adsorption processes were calculated from experimental polarization data and the interpretation of the results are given. Adsorption of CPB was found to follow the Langmuirs adsorption isotherm. Brij-30 is a mixed type of inhibitor.
Keywords: cetyl pyridinium bromide (CPB), corrosion inhibitors, mild steel, H2SO4, adsorption process, SEM, infra-red spectroscopy
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* Corresponding author. E-mail address: dubey_delhi@rediffmail.com