Journal of Applied Electrochemistry

, Volume 38, Issue 3, pp 289–295

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

  • Wei-hua Li
  • Qiao He
  • Sheng-tao Zhang
  • Chang-ling Pei
  • Bao-rong Hou
Original Paper

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 derivative Acid inhibitor Potentiodynamic polarization EIS Langmuir adsorption isotherm 

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Wei-hua Li
    • 1
  • Qiao He
    • 2
  • Sheng-tao Zhang
    • 2
  • Chang-ling Pei
    • 3
  • Bao-rong Hou
    • 1
  1. 1.Institute of OceanologyChinese Academy of SciencesQingdaoChina
  2. 2.College of Chemistry and Chemical EngineeringChongqing UniversityChongqingChina
  3. 3.School of Civil EngineeringQingdao Technological UniversityQingdaoChina

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