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The inhibitive effect of 5-amino-indole on the corrosion of mild steel in acidic media

✍ Scribed by M. Düdükcü

Publisher
John Wiley and Sons
Year
2010
Tongue
German
Weight
163 KB
Volume
62
Category
Article
ISSN
0947-5117

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✦ Synopsis

Abstract

The inhibitor performance of 5‐aminoindole (5‐AI) on mild steel corrosion in 0.5 M HCl was investigated in relation to the inhibitor concentration using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and linear polarization (LPR) methods. The effect of immersion time on the corrosion behavior of mild steel was also studied. The impedance data obtained were fitted and modeled using an equivalent circuit model. The results show that 5‐AI is an effective inhibitor and has an inhibition efficiency of 90% at 1 × 10^−2^ M additive concentration. The adsorption behavior of 5‐AI was also investigated. For this purpose, the adsorption equilibrium constant (K~ads~), and the free energy of adsorption (Δ__G__~ads~) were calculated and discussed. It was found that 5‐AI acts as mixed‐type inhibitor and obeys Langmuir adsorption isotherm with a free energy of adsorption of −27.71 kJ/mol.

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