2-Amino-3-methyl-3-(4-nitrophenyl)-5-(phenylthio)-3H-pyrrole-4-carbonitrile as effective corrosion inhibitor for mild steel in 1M HCl: Thermodynamical, electrochemical, surface and theoretical calculation

By Verma, Chandrabhan; Quraishi, M. A.
Published in Ain Shams Engineering Journal NULL 2016

Abstract

Abstract Present work describes the corrosion inhibition efficiency of 2-amino-3-methyl-3-(4-nitrophenyl)-5-(phenylthio)-3H-pyrrole-4-carbonitrile (INH) on mild steel in 1M {HCl} using weight loss, electrochemical, surface and molecular dynamics simulation methods. The weight loss results show that inhibition efficiency increasing with increasing {INH} concentration and maximum value was obtained at 50 mg/L concentration. Adsorption of the {INH} on mild steel surface obeys the Langmuir adsorption isotherm. Potentiodynamic polarization study suggests that investigated {INH} acts as mixed type inhibitor. {EIS} study indicates that the {INH} forms a protective surface film at metal/electrolyte interface. Both {SEM} and {AFM} studies show that surface smoothness increases due to formation of protective surface film by INH. The Monte Carlo simulation study suggests that {INH} has strong tendency to adsorb on mild steel surface in 1M HCl. The weight loss, electrochemical, surface and molecular dynamics calculations are in good agreement.

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