Effect of Silicon and Aluminum Addition on Corrosion Behavior of ODS Iron-Based Alloys in Liquid Lead-Bismuth Eutectic

doi:10.1007/s40195-022-01504-5

Abstract

Abstract:

The long-term corrosion behaviors of four variants of oxide dispersion strengthened (ODS) iron-based alloys in the stagnant oxygen-saturated lead-bismuth eutectic (LBE) at 550 °C were studied herein. The effects of silicon and aluminum content on the thickness, morphology and composition of the oxide scale were explored with the aid of X-ray diffraction (XRD), scanning electron microscopy (SEM), electron probe micro-analyzer (EPMA) and X-ray photoelectron spectroscopy (XPS). The addition of 1.5 wt% silicon is not able to contribute to forming a protective external silicon oxide film on the surface of aluminum-free ODS iron-based alloy, while the addition of aluminum promotes the formation of a thin and continuous alumina oxide scale. In the meantime, an appropriate amount of silicon becomes the heterogeneous nucleation site for alumina during the initial stage of oxidation, giving rise to the rapid formation of a protective alumina scale. However, excessive silicon has a negative impact on the formation of continuous alumina scale, because it may compete with aluminum to absorb more oxygen. The result of oxidation kinetics in ODS iron-based alloy shows that the parabolic rate constant of the alumina oxide scale is 3-4 orders of magnitude lower than that of the scale mainly composed of iron and chromium oxide.

Key words: Pb-Bi corrosion, Oxide dispersion strengthened (ODS) ferritic alloy, Silicon and aluminum addition, Oxide scale

Jing Li, Xiaochen Zhang, Haibin Ma, Liangyin Xiong, Shi Liu, Qisen Ren, Zhengzheng Pang. Effect of Silicon and Aluminum Addition on Corrosion Behavior of ODS Iron-Based Alloys in Liquid Lead-Bismuth Eutectic[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(5): 732-744.

Figures/Tables 12

Table 1 Chemical composition of ODS alloy (wt%)

Alloys	Fe	Cr	Al	Ti	Mn	Si	Y	O
12Cr-1.5Si^a	Bal	12.01	-	0.30	0.28	1.46	0.28	0.21
11Cr-3Al-1.0Si^b	Bal	10.54	3.13	0.33	0.12	1.04	0.31	0.18
13Cr-4Al-0.5Si^b	Bal	13.48	3.98	0.27	0.05	0.55	0.28	0.20
11Cr-5Al^b	Bal	11.15	5.11	0.28	0.09	0.10	0.29	0.18

Fig. 1 Cross-sectional SEM image and EDS analysis of oxidation products on 12Cr-1.5Si specimen after exposure for a, c 1000 h, b, d 3000 h

Fig. 2 a Surface morphology of corrosion product on 12Cr-1.5Si after 3000 h of exposure and b XRD patterns obtained from the region marked with red circle in a. The XRD test was carried out by using Co as an X-ray source (λ = 1.79801 Å)

Fig. 3 a, b Cross-sectional SEM image, c EDS line analysis of oxidation products on 11Cr-3Al-1.0Si specimen after exposure for 3000 h

Fig. 4 XRD pattern for 11Cr-3Al-1.0Si specimen after 3000 h of exposure. The XRD test was carried out by using Cu as an X-ray source (λ = 1.5418 Å)

Fig. 5 Cross-sectional SEM image of oxide scale on 13Cr-4Al-0.5Si specimen exposed for a 2000 h and b 3000 h, c EDS line analysis for 3000 h

Fig. 6 Auger electron spectroscopy depth profile of surface chemical composition and detailed XPS spectra of each element in the oxide scale of 13Cr-4Al-0.5Si after 3000 h of exposure

Fig. 7 Cross-sectional SEM image of oxide scale a at low magnification, b at high magnification in 11Cr-5Al specimen after 3000 h of exposure, c EDS point analysis result of oxide scale from b

Fig. 8 Auger electron spectroscopy depth profile of surface chemical composition and detailed XPS spectra of each element in the oxide scale of 11Cr-5Al after 3000 h of exposure

Fig. 9 Experimental points and simulation curves of oxide scale thickness with corrosion time in LBE at 550 °C

Table 2 Numerical data obtained from the fitting of oxide scale thickness

Alloys	K_p (cm² s⁻¹)	K_r (cm s⁻¹)	R^2*
12Cr-1.5Si	1.43 × 10^-12	3.14 × 10^-10	0.9981
13Cr-4Al-0.5Si	5.53 × 10^-15	1.71 × 10^-11	0.9995
11Cr-5Al	9.12 × 10^-16	3.34 × 10^-12	0.9998

Fig. 10 EPMA images of a 12Cr-1.5Si, b 11Cr-3Al-1.0Si after 3000 h of exposure

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