Effects of alloyed La, Cu and B on the oxidation of Fe-22Cr ferritic stainless steels under simulated cathode side atmosphere of solid oxide fuel cell interconnects

Title
Effects of alloyed La, Cu and B on the oxidation of Fe-22Cr ferritic stainless steels under simulated cathode side atmosphere of solid oxide fuel cell interconnects
Authors
김동익이영수스리니바산 스와미나탄
Keywords
Stainless steel; Copper; Rare earth elements; SIMS; Oxidation; Segregation
Issue Date
2018-04
Publisher
Corrosion science
Citation
VOL 133-164
Abstract
Discontinuous oxidation of La (0.14– 0.52 wt.%), Cu (0.17– 1.74 wt.%) and B (48– 109 ppm) alloyed Fe-22Cr ferritic stainless steels, and Crofer 22 APU (0.047 wt.% La), have been studied at 800 °C, in flowing air-2% H2O atmosphere, for 1300 h. The determined parabolic rate constants (1.65– 2.58×10-4 mg2 cm-4 h-1) are quite close to each other. Benefits of high La-alloying are not caused by the reduction in oxidation, but rather by the alteration in scale growth direction. On the other hand, high Cu-alloying promotes the segregation of Cu at the scale/alloy interface, which suppresses the sub-surface and/or internal oxidation.
URI
http://pubs.kist.re.kr/handle/201004/68019
ISSN
0010-938X
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