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Report No.

Corrosion behavior of high chromium steels in flowing lead-bismuth at 823K underactive oxygen control

Furukawa, Tomohiro  ; Konys, J.*; M$"u$ller, G.*; Aoto, Kazumi 

Two kind of high chromium martensitic steels named as 12Cr-steel and ODS-M, proposed for use in fast breeder reactors were subjected to corrosion tests in flowing lead bismuth eutectic (LBE) under active oxygen control at 823 K for up to 5,000 hours. The concentration of dissolved oxygen in LBE was controlled by H2/H2O mixture gas bubbling into LBE to keep at 10-6 wt%. However, the oxygen concentration was degreased with increasing of operation time, and temporarily reached below the value necessary for magnetite formation. Then, after 3,300 hours of effective operation time, oxygen concentration was controlled near the target value by periodically adding argon and mixtures of argon and technical air to the H2/H2O mixture gas stream through the oxygen control system. Both steels exposed in LBE under the condition showed approximately the same corrosion behavior. Double-layer structure composed of Fe-Cr spinel and diffusion zone were observed on the surface of the steels exposed for up to 2,000 hours. After 5,000 hours of exposure, it changed to single-structure composed of Fe-Cr spinel. Results of thickness measurement of the oxide layers, the total thickness of oxidized zone was approximately constant during test periods from 800 hours to 5,000 hours. It meant that the steels showed good corrosion resistance under this tested condition. In addition, both erosion and dissolution attack called as liquid metal corrosion were not observed on the all tested specimens.



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