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  • Chem Sci Trans., 2015, 4(1),  pp 161-175  

    DOI:10.7598/cst2015.970

    Research Article

    Corrosion Inhibition of Tin in Sodium Chloride Solutions Using Propaneitrile Derivatives

  • A.S. FOUDA1*, S.A. ABDEL-MAKSOUD2 and A.E. ALMETWALLY1
  • 1Chemistry Department, Faculty of Science, El-Mansoura University, El-Mansoura-35516, Egypt
    2Chemistry Department, Faculty of Science, Port Said University, Port Said, Egypt
  • Abstract

    Inhibition of corrosion of tin in 0.6 M NaCl by some propaneitrile derivatives namely: (2E)-3-(1H-indol-3-yl)-3-oxo-2-(3.4-diphenyl thiazol–2(3H)-ylidene)propanenitrile, (E)-3-(1H – indol-3- yl) -3-oxo-2- (5-oxo-3-phenyl thiazolidin-2-ylidene) propanenitrile, (E)-3-(1H-indol-3-yl)-3-yl)-3-oxo-2-(5-oxo-3-phenyl thiazolidin-2-ylidene) propanenitrile and (2-imino-2H-chromen-3-yl)(1H-indol-3-yl) methadone as investigated by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Polarization studies were carried out at different temperatures and showed that the investigated compounds were mixed type inhibitors. The effect of temperature on corrosion inhibition has been studied and some thermodynamic activation and adsorption parameters were calculated and discussed. The inhibition occurs through adsorption of the investigated compounds on the tin surface without modifying the mechanism of corrosion process. The experimental data fit Freundlich adsorption isotherm.

    Keywords

    Corrosion inhibition, Propanenitrile derivatives, Tin

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