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Formaldehyde Alkanoleamine as Novel Corrosion Inhibitors for Mild Steel in Hydrochloric Acid Medium.pdf

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Formaldehyde Alkanoleamine as Novel Corrosion Inhibitors for Mild Steel in Hydrochloric Acid Medium

Int. J. Electrochem. Sci., 8 (2013) 10851 - 10863 International Journal of ELECTROCHEMICAL SCIENCE Mannich Bases Derived from Melamine, Formaldehyde Alkanoleamines as Novel Corrosion Inhibitors for Mild Steel in Hydrochloric Acid Medium Chandrabhan Verma 1 , M. A. Quraishi 1,* , E.E. Ebenso 2 1 Department of Applied Chemistry, Indian Institute of Technology (Bananas Hindu University), Varanasi -221 005, (India) 2 Material Science Innovation Modelling (MaSIM) Research Focus Area, Faculty of Agriculture, Science and Technology, North-West University (Mafikeng Campus), Private Bag X2046, Mmabatho 2735, South Africa * E-mail: maquraishi.apc@itbhu.ac.in, maquraishi@ Received: 29 May 2013 / Accepted: 9 July 2013 / Published: 1 August 2013 The corrosion inhibition of mild steel using two new Mannich bases namely 2,2’,2’’((((1,3,5-triazine- 2,4,6-triyl)tris(azanediyl)tris(Methylene)tris(azanediyl)triethanol (INH-1) and 2,2’,2’’,2’’’,2’’’’((((1,3,5-triazine-2,4,6-triyl)tris(azanediyl)tris(Methylene)tris(azanediyl)hexaethanol (INH-2) has been investigated using weight loss and electrochemical methods . The INH-1and INH-2 showed maximum efficiency of 92% and 95% at 25ppm concentration respectively. Potentiodynamic polarization suggests that the inhibitors depict mixed type behavior. The Electrochemical impedance spectroscopy (EIS) measurement shows that inhibitors were adsorbed at mild steel surface and obeyed Langmuir adsorption isotherm. Various thermodynamic parameters were also determined to investigate the mechanism of corrosion inhibition. The results obtained from weight loss and electrochemical methods are in good agreements. Keywords: Acid corrosion, Mild steel, Thermodynamic parameter, EIS 1. INTRODUCTION Inhibited acidic solutions are extensively used in several industrial processes during acid pickling, acid cleaning, acid descaling and ocidization of oil well etc. [1]. It has been reported that