Open Access

Corrosion Inhibition of Mild Steel in Acid Medium using MUSA AcuminataFlower Extract

N. Gunavathy, Department of Chemistry, Nirmala College for Women, Coimbatore, TN, India. S. C. Murugavel psgmvel@yahoo.co.in
Department of Basic Sciences, PSG College of Technology, Coimbatore, TN, India.

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Abstract

The corrosive inhibitive effect of Musa acuminata flower [MAN (F)] extract in 1N H₂SO₄ on mild steel was evaluated using conventional weight loss, electrochemical polarization, impedance spectroscopy and scanning electron microscopy methods. The inhibition efficiency of MAN (F) increases with increase in concentration but decreases with increase in temperature. The polarization curves indicate that MAN (F) acts as a mixed type of inhibitor. Electrochemical impedance plots shows change in charge transfer capacitance with change inconcentration of inhibitor. Temkin adsorption isotherm was tested for its fit to experimental data. SEM study shows that inhibited metal surface is smoother than uninhibited surface indicating reduction of corrosion. A mechanism of physical adsorption is proposed for inhibition action.

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Reference

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