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Kondo, Masatoshi*; Kitamura, Yoshiki*; Kawarai, Atsushi*; Saito, Shigeru; Obayashi, Hironari
Corrosion Science, 262, p.113646_1 - 113646_14, 2026/04
Times Cited Count：0 Percentile：0.00(Materials Science, Multidisciplinary)The corrosion resistance of FeCrAl alloy APMT (Fe-21Cr-5Al-3Mo) in flowing lead-bismuth eutectic (LBE) was investigated by corrosion tests performed at 723 K using a non-isothermal forced convection loop. The oxygen concentration in flowing LBE was controlled at 1
10
wt%. No severe corrosion or erosion was detected on the specimens exposed to flowing LBE for 2000 h and 4000 h. Multiple oxide layers consisting of Fe-rich, Cr-rich and Al-rich sub-layers were formed in situ on the surface of APMT during the corrosion tests, which effectively suppressed corrosion and erosion. The oxide layers were intentionally removed by gentle abrasion prior to re-immersion and the specimens were then re-immersed in flowing LBE for an additional 2000 h. The oxide layers were spontaneously re-formed in situ on the abraded surface. This behavior indicates a self-healing capability. The results of micro-scratch tests indicated that the in-situ formed multiple oxide layers exhibited high adhesion strength in the shear direction after the 2000 h corrosion test.
Kitamura, Yoshiki*; Kawarai, Atsushi*; Kondo, Masatoshi*; Saito, Shigeru; Obayashi, Hironari
no journal, ,
FeCrAl alloys are promising structural materials for accelerator driven systems (ADSs) and lead cooled fast reactors (LFRs). The corrosion tests of APMT (Fe-21Cr-5Al-3Mo) were performed in flowing lead bismuth eutectic (LBE) for 2000 
4000 hours at temperature of 450 
C, oxygen concentrations of 10-4-10-6 wt.% and flow velocity of 1 m/s by OLLOCHI loop (JAEA/J-PARC). The in-situ self-healing behavior of the oxide layer in flowing LBE was clarified by means of the corrosion test with the specimen in which the protective oxide layer was artificially removed in the middle of the corrosion test. The relationship between the adhesion in the shear direction and the roughness of the layer-substrate interface was also clarified.
