Corrosion Inhibition of Mild Steel Using Brij-30

A.K. Dubey^a),* and G. Singh ^b)

^a Polymer & 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 24 May 2006

 

Abstract

The corrosion inhibition of mild steel in one normal sulphuric acid solution by Brij-30 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 is given. Adsorption of Brij-30 was found to follow the Langmuir’s adsorption isotherm. Brij-30 is a mixed type of inhibitor.

Keywords: Brij-30, corrosion inhibitors, mild steel, H₂SO₄, adsorption process, SEM, IR spectra

 

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* Corresponding author. E-mail address: dubey_delhi@rediffmail.com