Journal of Applied Electrochemistry

, Volume 38, Issue 3, pp 289–295

Some new triazole derivatives as inhibitors for mild steel corrosion in acidic medium

Authors

    • Institute of OceanologyChinese Academy of Sciences
  • Qiao He
    • College of Chemistry and Chemical EngineeringChongqing University
  • Sheng-tao Zhang
    • College of Chemistry and Chemical EngineeringChongqing University
  • Chang-ling Pei
    • School of Civil EngineeringQingdao Technological University
  • Bao-rong Hou
    • Institute of OceanologyChinese Academy of Sciences
Original Paper

DOI: 10.1007/s10800-007-9437-7

Cite this article as:
Li, W., He, Q., Zhang, S. et al. J Appl Electrochem (2008) 38: 289. doi:10.1007/s10800-007-9437-7

Abstract

Two triazole derivatives, 3,4-dichloro-acetophenone-O-1′-(1′,3′,4′-triazolyl)-methaneoxime (4-DTM) and 2,5-dichloro-acetophenone-O-1′-(1′,3′,4′-triazolyl)-methaneoxime (5-DTM) were synthesized, and the inhibition effects for mild steel in 1 M HCl solutions were investigated by weight loss measurements, electrochemical tests and scanning electronic microscopy (SEM). The weight loss measurements showed that these compounds have excellent inhibiting effect at a concentration of 1.0 × 10−3 M. The potentiodynamic polarization experiment revealed that the triazole derivatives are inhibitors of mixed-type and electrochemical impedance spectroscopy (EIS) confirmed that changes in the impedance parameters (Rct and Cdl) are due to surface adsorption. The inhibition efficiencies obtained from weight loss measurements and electrochemical tests were in good agreement. Adsorption followed the Langmuir isotherm with negative values of the free energy of adsorption \( \Updelta G^{o}_{{{\text{ads}}}} \). The thermodynamic parameters of adsorption were determined and are discussed. Results show that both 4-DTM and 5-DTM are good inhibitors for mild steel in acid media.

Keywords

Triazole derivativeAcid inhibitorPotentiodynamic polarizationEISLangmuir adsorption isotherm

Copyright information

© Springer Science+Business Media B.V. 2007