Journal
ACTA METALLURGICA SINICA
Volume 46, Issue 8, Pages 946-950Publisher
SCIENCE PRESS
DOI: 10.3724/SP.J.1037.2010.00129
Keywords
Zr-4 alloy; high temperature and pressure of water environment; electrochemical impedance spectroscopy (EIS); corrosion
Categories
Funding
- National Natural Science Foundation of China [50771109]
- Weapon & Equipment Pre-research Fund [9140C700401803]
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The electrochemical impedance spectroscopy (EIS) was used to analyze the corrosion evolution of pre- and post-transition of the annealed Zr-4 alloy in 0 01 mol/L LiOH aqueous solution at 360 degrees C/18 6 MPa. The results show that oxidation weight gain of Zr-4 alloy increases slowly before corrosion transition When Zr is oxidized into ZrO2, the stress appears in the oxide film clue to volume expansion. With gradually thickening of the oxide film; accumulation of micro-defects will relax the stress in outer layer of oxide film. As a result; the uniform and compact oxide layer turns into double layer with a porous outer layer and a. dense inner one Meanwhile the impedance spectra evolve from single arc into double capacitive arcs When the oxide film forms macro-defects such as cracks; corrosion transition takes place; giving rise to an acceleration of oxidation weight gain and the rapid drop of impedance and corrosion potential. Corrosion potential and electrochemical impedance spectroscopy are able to obtain in situ some information of the transition point
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