Header menu link for other important links
X
Mechanistic analysis of Zr dissolution in acidic fluoride media using electrochemical impedance spectroscopy
M. S. Amrutha,
Published in Electrochemical Society Inc.
2017
Volume: 77
   
Issue: 11
Pages: 1571 - 1585
Abstract
The mechanism of dissolution of Zr in 10 mM HF was investigated using potentiodynamic polarization and electrochemical impedance spectra acquired at various dc potentials. The surface morphological changes in the active and passive regions were studied using atomic force microscopy. The EIS spectra acquired at various dc potentials were modeled using electrical equivalent circuit fitting. A four step mechanism which consists two intermediates and a chemical and electrochemical dissolution steps was used to explain the polarization and EIS results. The model predicts the active-passive transitions in the polarization curve and qualitatively matches the patterns of EIS spectra observed in active and passive regions. The changes of the surface coverage and the dissolution rates with over potential were estimated.
About the journal
JournalECS Transactions
PublisherElectrochemical Society Inc.
ISSN19386737
Open AccessNo
Concepts (13)
  •  related image
    Atomic force microscopy
  •  related image
    Dissolution
  •  related image
    Equivalent circuits
  •  related image
    Polarization
  •  related image
    Dissolution rates
  •  related image
    Electrical equivalent circuit
  •  related image
    ELECTROCHEMICAL DISSOLUTION
  •  related image
    ELECTROCHEMICAL IMPEDANCE SPECTRA
  •  related image
    MECHANISTIC ANALYSIS
  •  related image
    Morphological changes
  •  related image
    PASSIVE TRANSITION
  •  related image
    POLARIZATION CURVES
  •  related image
    Electrochemical impedance spectroscopy