Research on Chemical Intermediates

, Volume 40, Issue 8, pp 2689–2701

Corrosion inhibition investigations of 3-acetylpyridine semicarbazone on carbon steel in hydrochloric acid medium

  • Vinod P. Raphael
  • K. Joby Thomas
  • K. S. Shaju
  • Aby Paul
Article

DOI: 10.1007/s11164-013-1122-3

Cite this article as:
Raphael, V.P., Thomas, K.J., Shaju, K.S. et al. Res Chem Intermed (2014) 40: 2689. doi:10.1007/s11164-013-1122-3
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Abstract

The corrosion inhibition efficiency of 3-acetylpyridine-semicarbazide (3APSC) on carbon steel (CS) in 1.0 M HCl solution has been investigated using weight loss measurements, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization studies. The results show that inhibition efficiency on metal increases with the inhibitor concentration. 3APSC exhibited marked inhibition towards carbon steel in HCl medium even at low concentrations. The adsorption of inhibitor on the surfaces of the corroding metal obeys the Langmiur isotherm and thermodynamic parameters (Kads, ∆Gads0) were calculated. Activation parameters of the corrosion process (Ea, ∆H* and ∆S*) were also calculated from the corrosion rates. Polarization studies revealed that 3APSC act as a mixed-type inhibitor. Surface analysis of the metal specimens was performed by scanning electron microscopy.

Keywords

Carbon steelSemicarbazoneCorrosion inhibitorsIsothermSEM

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Vinod P. Raphael
    • 1
  • K. Joby Thomas
    • 1
  • K. S. Shaju
    • 1
  • Aby Paul
    • 1
  1. 1.Research Division, Department of ChemistrySt.Thomas’ College (University of Calicut)ThrissurIndia