Corrosion Behaviors and Mechanisms of ODS Steel Exposed to Static Pb-Bi Eutectic at 600 and 700 ℃

doi:10.11900/0412.1961.2020.00035

Acta Metall Sin

2020, Vol. 56

Issue (10): 1366-1376 DOI: 10.11900/0412.1961.2020.00035

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Corrosion Behaviors and Mechanisms of ODS Steel Exposed to Static Pb-Bi Eutectic at 600 and 700 ℃

BAO Feiyang¹^,², LI Yanfen¹^,²^,³(

), WANG Guangquan²^,⁴, ZHANG Jiarong², YAN Wei¹^,²^,³, SHI Quanqiang²^,³, SHAN Yiyin¹^,²^,³, YANG Ke¹^,², XU Bin⁵, SONG Danrong⁵, YAN Mingyu⁵, WEI Xuedong⁵

1 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
4 Nano Science and Technology Institute, University of Science and Technology of China, Suzhou 215000, China
5 Nuclear Power Institute of China, Chengdu 610005, China

Cite this article:

BAO Feiyang, LI Yanfen, WANG Guangquan, ZHANG Jiarong, YAN Wei, SHI Quanqiang, SHAN Yiyin, YANG Ke, XU Bin, SONG Danrong, YAN Mingyu, WEI Xuedong. Corrosion Behaviors and Mechanisms of ODS Steel Exposed to Static Pb-Bi Eutectic at 600 and 700 ℃. Acta Metall Sin, 2020, 56(10): 1366-1376.

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Abstract

With good neutron properties, anti-irradiation performances, heat transfer properties and inherent safety characteristics, liquid lead or Pb-Bi eutectic (LBE) has been a primary candidate coolant for accelerator driven system and advanced nuclear reactors. However, corrosion of structural materials is a critical challenge in the use of liquid lead and LBE in high temperature nuclear reactors. Therefore, research on corrosion compatibility of structural materials with LBE at elevated temperatures is of great significance. In this work, the long-term corrosion experiments in static LBE for a oxide dispersion strengthened (ODS) steel were carried out at 600 and 700 ℃. The temperature effects on different corrosion behaviors were studied by the analyses of XRD, SEM and EDS, and the underlying mechanisms were clarified. After exposing to LBE at 600 ℃ for up to 2000 h, a typical double-layer oxide scale with the thickness of about 10 μm was formed on the surface of ODS steel, which was composed of outer layers of Pb-Fe-O and Fe₃O₄ and inner layer of Fe-Cr-Al spinal. In addition, a thin Al-rich layer was also formed under the inner layer. Due to the protective effect of the relatively dense inner layer and the Al-rich layer, ODS steel showed excellent resistance to LBE corrosion at 600 ℃ with a significantly lower corrosion rate. On the contrary, when exposed to LBE at 700 ℃ , the structure and thickness of the oxide scale formed on the surface of the ODS steel were obviously different. After exposure for 100 h, a dense protective Al₂O₃ oxide layer with a thickness of about 500 nm was formed, greatly reducing the corrosion rate. With the corrosion time prolonging to 500 h at 700 ℃, most of Al₂O₃ layer was still remained. However, a few of nodular-like oxides were formed originated from local weak areas, which broken off the continuity of protective Al₂O₃and led to deeper corrosion by LBE.

Key words: advanced nuclear energy system Pb-Bi eutectic (LBE) oxide dispersion strengthened (ODS) steel high temperature corrosion oxide scale

Received: 21 January 2020

ZTFLH:

TG172

Fund: Nuclear Power Technology Innovation Center Project of Nuclear Power Institute of China(HDLCXZX-2019-HD-15-01);National Natural Science Foundation of China(U1832206);"Excellent Scholar Funding" initialed by Institute of Metal Research, Chinese Academy of Science(JY7A7A111A1)

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	Feiyang BAO
	Yanfen LI
	Guangquan WANG
	Jiarong ZHANG
	Wei YAN
	Quanqiang SHI
	Yiyin SHAN
	Ke YANG
	Bin XU
	Danrong SONG
	Mingyu YAN
	Xuedong WEI

URL:

https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00035 OR https://www.ams.org.cn/EN/Y2020/V56/I10/1366

Fig.1 Schematic of corrosion test equipment (LBE—lead-bismuth eutectic)

Fig.2 XRD spectra of ODS steel exposed to static LBE at 600 ℃ (a) and 700 ℃ (b) for different time (PF—plumboferrite)

Fig.3 SEM images of surface scale formed on ODS steel exposed to static LBE at 600 ℃ for 100 h (a), 500 h (b), 1000 h (c) and 2000 h (d) (Insets show the corresponding high magnified morphologies)

Fig.4 SEM images of surface scale formed on ODS steel after exposed to static LBE at 600 ℃ for 100 h
(a) a representative area (b) regular octahedral particles area marked as "b" in Fig.4a

Table 1 EDS analyses of the surface oxides of ODS steel exposed to static LBE at 600 ℃ for 100 h in Fig.4

Fig.5 Low and high magnified SEM images of the surface scale formed on ODS steel exposed to static LBE at 700 ℃ for 100 h (a, b) and 500 h (c~f) (Figs.5e and f are high magnified SEM images for the nodular area marked as "e" and flat area marked as "f" in the Fig.5d, respectively)

Table 2 EDS analyses of the surface oxides of ODS steel exposed to static LBE at 700 ℃ for 500 h in Figs.5e and f

Fig.6 Low (a, c, e, g) and high (b, d, f, h) magnified SEM images of cross-section oxide scale formed on ODS steel exposed to static LBE at 600 ℃ for 100 h (a, b), 500 h (c, d), 1000 h (e, f) and 2000 h (g, h)

Fig.7 EDS analyses of cross-section oxide scale formed on ODS steel exposed to static LBE at 600 ℃ for 500 h
Color online

Fig.8 Low (a, c) and high (b, d) magnified SEM images of cross-section oxide scale formed on ODS steel exposed to static LBE at 700 ℃ for 100 h (a, b) and 500 h (c, d)

Fig.9 EDS analyses of cross-section oxide scale formed on ODS steel exposed to static LBE at 700 ℃ for 500 h
Color online

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