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Inhibiting effect of N,N,N-Trimethyldodecylammonium bromide on Corrosion of mild Steel in 0.5M Sulphuric acid solution, its Adsorption and Kinetic Characteristics

Author Affiliations

  • 1Department of chemistry, BNM Institute of Technology, Bengaluru-70, INDIA
  • 2 Department of chemistry, RAMCO Institute of Technology, Rajapalayam, Tamil Nadu- 626 117, INDIA
  • 3 Department of chemistry, Dr. Ambedkar Institute of Technology, Bengaluru, INDIA

Res. J. Material Sci., Volume 2, Issue (5), Pages 1-10, October,16 (2014)

Abstract

The corrosion behavior of mild steel in 0.5M Sulphuric acid containing different concentrations of N,N,N-trimethyldodecylammonium bromide (TDAB) has been studied by weight loss, Tafel polarization and Electrochemical impedance spectroscopic techniques at 298, 308, 318 and 328K respectively. The mild steel samples were also analyzed by scanning electron microscopy. Electrochemical and impedance parameters such as corrosion potential, corrosion current density, Tafel slopes, charge transfer resistance and electrical double layer were determined. The kinetic and thermodynamic parameters for mild steel corrosion and inhibitor adsorption, respectively, were determined and discussed. The results showed that concentration of Inhibitor and test temperatures can affect the % inhibition efficiency. The % corrosion inhibition efficiency increases with increase in concentration and decreases with increase in temperature. The maximum corrosion inhibition efficiency obtained is 95.5%. As the inhibitor concentration increased, the charge transfer resistance increased and double layer capacitance decreased. It was found that TDAB is an excellent inhibitor for mild steel in acidic medium. Adsorption of the inhibitor molecules on the mild steel surface obeyed the Langmuir adsorption isotherm. On the basis of thermodynamic adsorption parameters, comprehensive adsorption for the studied inhibitor on mild steel surface was suggested.

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