Uniform corrosion behavior of FeCrAl alloys in borated and lithiated high temperature water

doi:10.1016/j.jmst.2020.07.026

Abstract

Abstract:

The uniform corrosion behavior of model FeCrAl alloys as well as commercial Zircaloy-4 as reference material were investigated in 360 °C borated and lithiated water. The results reveal that FeCrAl alloys exhibited better corrosion resistance than Zircaloy-4. It is found that the oxide films formed on the FeCrAl alloys are composed of outer Fe₃O₄ layer, inner layer consisting of compact spinel layer and porous spinel layer, and transition layer containing Al-Cr-rich oxides and matrix enriched with Fe°. The spinel oxides in the inner layer are FeFe_2-_x-_y_-zCr_xAl_yMo_zO₄. The corrosion mechanism of FeCrAl alloys in high temperature water is discussed.

Key words: FeCrAl, Alloys, High temperature corrosion, Oxidation, SEM, TEM

Fangqiang Ning, Xiang Wang, Ying Yang, Jibo Tan, Ziyu Zhang, Dan Jia, Xinqiang Wu, En-Hou Han. Uniform corrosion behavior of FeCrAl alloys in borated and lithiated high temperature water[J]. J. Mater. Sci. Technol., 2021, 70: 136-144.

Figures/Tables 12

Table 1 : Compositions of FeCrAl alloys used in the present work (wt. %).

Alloy	Fe	Cr	Al	Mo	Y	S	P	O	N	H
FeCrAl-1	Bal.	12.89	5.04	4.10	<0.005	0.003	0.005	0.0011	0.0030	<0.00006
FeCrAl-2	Bal.	12.99	5.03	4.02	0.015	0.002	0.004	0.0011	0.0030	<0.00006

Fig. 1. The metallographic images of FeCrAl alloys: (a) FeCrAl-1 alloy (b) FeCrAl-2 alloy.

Fig. 2. Schematic diagram of high temperature and high pressure flowing water apparatus.

Table 2 Testing conditions in the present work.

Parameter	Parameter range
H₃BO₃	1200 ppm (by weight)
LiOH	2.3 ppm (by weight)
Flow rate	0.3 L/h
Pressure	19 MPa
Temperature	360 ± 2 °C
Dissolved oxygen	< 5 ppb (by weight)

Fig. 3. Mass changes of FeCrAl alloys and Zircaloy-4 specimens exposed to borated and lithiated high temperature water at different exposure time.

Fig. 4. Surface morphologies of oxide films on the three alloys after 100 days exposure test: (a, b) Zircaloy-4, (c, d) FeCrAl-1 alloy, (e, f) FeCrAl-2 alloy.

Fig. 5. XRD spectra of the oxide films on the three alloys after 100 days exposure test.

Fig. 6. XPS core level spectra of O 1s and Fe 2p3/2 in the oxide film on FeCrAl-1 alloy after different sputtering time.

Fig. 7. SEM observation and analysis of the oxide film formed on Zircaloy-4: (a) SEM cross-sectional morphology of the oxide film, (b) mapping for O, (c) mapping for Zr.

Fig. 8. TEM observation and analysis of the oxide film formed on FeCrAl-1 alloy: (a) TEM cross-sectional morphology of the oxide film, (b) mappings for O, Fe, Cr, Al and Mo, (c) magnified image of rectangular in Fig. 8(a), (d) EDS line analysis collected along line shown in Fig. 8(a), (e) selected area electron diffraction of the oxide film.

Fig. 9. TEM observation and analysis of the oxide film formed on FeCrAl-2 alloy: (a) TEM cross-sectional morphology of the oxide film, (b) mappings for O, Fe, Cr, Al and Mo, (c) magnified image of rectangular in Fig. 9(a), (d) EDS line analysis collected along line shown in Fig. 9(a), (e) selected area electron diffraction of the oxide film.

Fig. 10. Schematic of corrosion process of FeCrAl alloy in borated and lithiated high temperature water.

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