Volume 23 Preprint 50

Electrochemical and theoretical studies on protective film formed by a synthesized Schiff base on mild steel surface in acid media

Pandimuthu Gandhi, rameshkumar subramaniam, Paramasivaganesh Kumaraswamy and Sankar Arumugam

Keywords: Schiff base, corrosion inhibition, electrochemical studies, adsorption isotherm, potential of zero charge

The Schiff base, N-((1H-indol-3-yl)methylene)-2,3dihydrobenzo[b][1,4]dioxin-6-amine (BIS) has been synthesized and its corrosion inhibition property on the corrosion of mild steel in 1.0 M HCl and 0.5 M H2SO4 media was studied by weight loss and electrochemical methods. The experimental results revealed that the corrosion inhibition efficiency increased with the concentration of inhibitor and exhibits higher corrosion inhibition efficiency in 1.0 M HCl solution than in 0.5 M H2SO4 solution. Tafel polarization curves showed that the Schiff base is mixed type inhibitor. The adsorption of the compound on the mild steel surface obeyed Langmuir adsorption isotherm. Corrosion inhibition mechanism was proposed based on the measurement of potential of zero charge and adsorption isotherm studies in the acid media. Effect of temperature on corrosion inhibition was studied using electrochemical impedance spectroscopy. The surface morphology of mild steel surface was analyzed using SEM and AFM techniques. Quantum chemical parameters of Schiff base molecules and its protonated form have also been derived and discussed.

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