Some test materials (i.e. Fe, Cr, Y and JLF-1 steel) were immersed to liquid metal lead (Pb) mainly at 773 K
as the working electrode of electrochemical impedance spectroscopy (EIS). Some oxide layers formed on
the electrodes in liquid Pb were analyzed by EIS. The impedance response was summarized as semicircular
Nyquist plot, and the electrical properties and the thickness of the oxide layers were evaluated in non-destructive manner. Large impedance due to the formation of Y oxide formed in liquid Pb was detected by
EIS, though impedance of Fe oxide and Cr oxide could not be detected due to their small electro resistance.
The time constant of the oxide layers was evaluated from the impedance information, and this value
identified the types of oxides. The change of the time constant with the immersion time indicated the
change of the electrical properties determined by the chemical composition and the crystal structure. The
thickness of the oxide layer estimated by EIS agreed well with that evaluated by metallurgical analysis.
The growth of Y oxide layer in the liquid Pb was successfully detected by EIS in non-destructive manner.
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