J. Iran. Chem. Soc., Vol. 6, No. 2 June 2009, pp.353~363.

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Carmine and Fast Green as Corrosion Inhibitors for Mild Steel in Hydrochloric Acid Solution

R.A. Prabhua, T.V. Venkateshab,* and A.V. Shanbhagc

aDepartment of Chemistry, M.G.C. Arts, Commerce and G.H.D. Science College, Siddapur (UK)- 581355, Karnataka, India
bDepartment of P.G. Studies and Research in Chemistry, Kuvempu University, Shankaraghatta- 577451, Karnataka, India
cDepartment of Chemistry, S.D.M. College, Honavar (UK)- 581334, Karnataka, India

The inhibition action of carmine and fast green dyes on corrosion of mild steel in 0.5 M HCl was investigated using mass loss, polarization and electrochemical impedance (EIS) methods at 300 K. The inhibition efficiency was found to increase with increasing concentration of the inhibitors. The inhibition efficiency of fast green (%η - 98) is higher than that of carmine (%η - 92) and found to be maximum in 1 × 10-3 M solution. The inhibitors act as mixed type with predominant cathodic effect. The inhibitors were adsorbed on the mild steel surface according to the Temkin adsorption isotherm. The surface morphology of the mild steel specimens was evaluated using SEM images.

Keywords: Dyes, Carmine, Fast green, Corrosion inhibition, Mild steel, Adsorption

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