The corrosion characteristics of reduced activation ferritic martensitic steels, JLF-1 (Fe-9Cr-1.94W-0.09C)
and 9Cr-ODS (Fe-9Cr-1.97W-0.14C-0.29Y-0.23Ti), and unalloyed metals of Cr, W and Mo in liquid Pb-17Li
were investigated by means of static corrosion tests at 600
◦
C for 500 hours. The corrosion of the JLF-1 steel was
based on the dissolution of Fe and Cr from the steel surfaces in the Pb-17Li. The dissolution type corrosion of
the 9Cr-ODS steel was based on the strong depletion of Cr, W and O at the steel surface. The corrosion of the
unalloyed Cr specimen in the Pb-17Li was much larger than that based on the Cr solubility in the Pb-17Li when a
Mo crucible was used in the corrosion test. The corrosion was promoted under an unsaturated condition because
the wetted surface of the Mo crucible trapped the dissolved Cr in the Pb-17Li by the alloying process. The
dissolution of Mo in the Pb-17Li was also promoted by the alloying with the dissolved Cr though the solubility
of Mo in the Pb-17Li was quite low. The weight loss of the unalloyed W specimen exposed in the Pb-17Li was
larger than that estimated from the solubility in the Pb-17Li. Some oxide particles were detected on the surface
of the W specimen. The reasonable mechanism on the large weight loss of the W specimen was the formation
and detachment of the oxide particles in the Pb-17Li.
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