Corrosion behavior of Fe–14Cr–2W and Fe–9Cr–2W ODS steels in stagnant liquid Pb with different oxygen concentration at 550 and 650°C

Corrosion behaviour of oxide dispersion strengthened iron‐chromium steels in liquid lead at 973 K

“…static Pb and T = 923 K, the formation of a Cr rich oxide layer was detected for oxygen contents in the liquid metal ranging between dissolution (<10 −7 wt% O) and severe oxidation (∼10 −3 wt% O) regimes, i.e. in the passivation regime (∼10 −6 wt% O) . The layers observed on the surface of 14Cr‐ODS steel appear more continuous as compared to those formed on the surface of the 9Cr‐ODS steel …”

“…in the passivation regime (∼10 −6 wt% O) . The layers observed on the surface of 14Cr‐ODS steel appear more continuous as compared to those formed on the surface of the 9Cr‐ODS steel …”

“…Therefore, the understanding of the interactions between the structural materials and HLM plays a crucial role in the development of LFR . The operating conditions, such as temperature, time, surrounding atmosphere and oxygen content in the liquid metal are important parameters that characterise the corrosion behaviour . Although the compatibility of conventional austenitic and ferritic‐martensitic steels with liquid lead or its alloys has been widely studied the literature regarding the interactions of ODS steels with HLM is quite scarce and mainly focused on steels with 8–9 wt% Cr for temperatures lower than 923 K and for the oxygen contents ranging from 10 −8 to 10 −3 wt% O .…”

“…The literature data on the corrosion behaviour of ODS steels with nominally 8 ÷ 13 wt% Cr, tested in HLM with a dissolved oxygen concentration ranging from 10 −6 to 10 −3 wt%, indicate the formation of a double oxide layer constituted by a spinel in the inner part and magnetite in the external part, whose stability depends on the oxygen content in the liquid metal. The oxidation/corrosion behaviour of 9Cr‐ODS, 12Cr‐ODS, 13Cr‐ODS and 14Cr‐ODS steels in a lead bath under stagnant conditions, for temperatures lower than 923 K and for different oxygen contents has been investigated recently. The formation of Fe‐Cr spinel type oxides on the tested steel samples has been observed to be independent of Cr content, but the oxide scales morphologies and their thickness are strongly dependent on the operating temperature and oxygen content …”

“…In the present work, the corrosion behaviour of ODS steels with different Cr contents (9, 12 and 14 wt% Cr) immersed in a stagnant lead bath is investigated. The corrosion tests were performed at T = 973 K for a duration time of 2000 h and an oxygen concentration ranging between 10 −5 and 10 −4 wt% O and differ from the corrosion tests in static lead or lead‐bismuth reported in the literature, since the data were obtained mainly at a maximum temperature of 923 K and for a processing time of up to 1700 h.…”