Role of Anion and Immersion Time in the Mechanism of Inhibition of Corrosion of Nickel in Neutral Aqueous Solutions by Diethyl Dithiocarbamate (DEDTC)

M. E. Mohamed M. E. Mohamed , B. A. Abd-El-Nabey B. A. Abd-El-Nabey
Российский электрохимический журнал
Abstract / Full Text

Role of anion and immersion time in the mechanism of the inhibition of corrosion of nickel in 0.5 M aqueous solutions of each of NaCl and Na2SO4 by diethyl dithiocarbamate have been investigated using potentiodynamic, electrochemical impedance spectroscopy (EIS), SEM and EDX techniques. Potentiodynamic polarization results indicated that DEDTC act as anodic type inhibitor and have higher inhibition efficiency for the corrosion of nickel in Na2SO4 than that in NaCl solutions due to the competitive adsorption between Cl and DEDTC anions at the Ni/solution interface. EIS, SEM and EDX results indicated that in presence of low concentrations of DEDTC in the condition of any immersion period, the inhibition process of corrosion of nickel is controlled by adsorption of the diethyl dithiocarbamate anions at the metal/solution interface. However, in condition of presence of a higher concentration of DEDTC and long immersion time, the inhibition process of the corrosion of nickel is controlled by deposition of the nickel–DEDTC complex.

Author information
  • Faculty of Science, Chemistry Department, Alexandria University, P.O. Box 426, 21321, Alexandria, Egypt

    M. E. Mohamed & B. A. Abd-El-Nabey

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