Dissolution and oxidation behaviour of various austenitic steels and Ni rich alloys in lead-bismuth eutectic at 520 °C

JOURNAL OF NUCLEAR MATERIALS

卷:468

Article

Roy, Marion¹  Martinelli, Laure¹  Ginestar, Kevin¹  Favergeon, Jerome²  Moulin, Gerard² 

[1] CEA, DEN, DPC, SCCME,Lab Etud Corros Non Aqueuse, F-91191 Gif Sur Yvette, France

[2] Univ Technol Compiegne, Ctr Rech Royallieu, UMR 7337, Lab Roberval, F-60203 Compiegne, France

关键词: Dissolution;    Oxidation;    Lead-bismuth eutectic;    Austenitic stainless steels;    Nickel rich alloys;    Oxygen;    Silicon;   

DOI  :  10.1016/j.jnucmat.2015.11.005

来源: Elsevier

【 摘 要 】

Ten austenitic steels and Ni rich alloys were tested in static lead-bismuth eutectic (LBE) at 520 degrees C in order to obtain a selection of austenitic steels having promising corrosion behaviour in LBE. A test of 1850 h was carried out with a dissolved oxygen concentration between 10(-9) and 5 10(-4) g kg(-1). The combination of thermodynamic of the studied system and literature results leads to the determination of an expression of the dissolved oxygen content in LBE as a function of temperature: RT(K)ln[O](wt %) = 57584/T(K) -55.876T(K) + 254546 (R is the gas constant in J mol(-1) K-1). This relation can be considered as a threshold of oxygen content above which only oxidation is observed on the AISI 316L and AISI 304L austenitic alloys in static LBE between 400 degrees C and 600 degrees C. The oxygen content during the test leads to both dissolution and oxidation of the samples during the first 190 h and leads to pure oxidation for the rest of the test. Results of mixed oxidation and dissolution test showed that only four types of corrosion behaviour were observed: usual austenitic steels and Ni rich alloys behaviour including the reference alloy 17Cr-12Ni-2.5Mo (AISI 316LN), the 20Cr-31Ni alloy one, the Si containing alloy one and the Al containing alloy one. According to the proposed criteria of oxidation and dissolution kinetics, silicon rich alloys and aluminum rich alloy presented a promising corrosion behaviour. (C) 2015 Elsevier B.V. All rights reserved.

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