Corrosion Behavior of Pre-oxidized GH4169 Alloy with Solid NaCl Deposited in a Wet Oxygen Flow at 600 °C

doi:10.1007/s40195-024-01699-9

Abstract

Abstract:

The corrosion behavior of the pre-oxidized GH4169 alloy was studied after 20 h of exposure under a solid NaCl deposit film in a wet O₂ environment at 600 °C by mass-gain measurements, X-ray diffraction, scanning electron microscopy, transmission electron microscopy methods. The results indicate that the pre-oxidized GH4169 alloy undergoes serious corrosion in the corrosive condition. The preformed Cr₂O₃ layer is gradually destroyed by deposit NaCl, and the inner Nb₂O₅ layer beneath the complete outer Cr₂O₃ layer also reacts with NaCl to form NaNbO₃. The electrochemical test results testified the existence of electrochemical reactions during this corrosion process. The corrosion behavior of pre-oxidized GH4169 under a solid NaCl deposit film in a wet O₂ environment at 600 °C has been discussed in detail.

Key words: Pre-oxidation, Solid NaCl, Wet O₂, Electrochemical corrosion

Weidong Zhang, Yu Cui, Li Liu, Wenquan Wang, Wenzheng Chen, Rui Li, Fuhui Wang. Corrosion Behavior of Pre-oxidized GH4169 Alloy with Solid NaCl Deposited in a Wet Oxygen Flow at 600 °C[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(7): 1249-1264.

Figures/Tables 19

Table 1 Chemical composition of GH4169 alloy studied in this work (wt%)

C	Cr	Mo	Al	Ti	Fe	Nb + Ta	B	Ni
0.045	19.09	3.25	0.88	0.83	18.0	5.08	0.05	Bal.

Fig. 1 Schematic diagram of three-electrode cell: the top view a; and the cross-section view b

Fig. 2 SEM morphologies and oxides composition of GH4169 after oxidation at 900 °C for 10 h: surface morphology a; cross-section morphology b; and XRD pattern c

Fig. 3 TEM morphologies a, elemental mappings b, SAED of Spot 1 c and SAED of Spot 2 d in the scale formed on the GH4169 alloy after 10 h oxidation at 900 °C

Fig. 4 Corrosion kinetics curves of the pre-oxidized GH4169 alloy with solid NaCl deposited in wet O2 (black points) and wet O2 (red points) conditions at 600 °C

Fig. 5 Surface morphologies of the pre-oxidized GH4169 alloy corroded at 600 °C for 20 h in the wet O2 a; and with solid NaCl deposited in wet O2 b

Fig. 6 Cross-section morphologies of the pre-oxidized GH4169 alloy corroded at 600 °C for 20 h in the wet O2 a; and with solid NaCl deposited in wet O2 b

Fig. 7 XRD of the pre-oxidized GH4169 alloy exposed to the solid NaCl deposited in wet O2, and wet O2 conditions for 20 h at 600 °C

Fig. 8 Surface morphologies of the pre-oxidized GH4169 alloy corroded with NaCl deposited in wet O2 condition for 2 h a, 3 h b, 5 h c, and 10 h d

Table 2 EDS results for elements of the composition at each point in Fig. 8 (at.%)

	O	Cr	Fe	Ni	Nb	Al	Ti	Mo	Na	Cl
1	32.5	57.56	2.81	0.23	0.24	2.43	1.12	0.78	0.31	0.02
2	34.29	58.94	1.13	0.57	2.31	1.18	0.02	0.34	1.21	0.01
3	28.76	61.65	2.33	2.49	1.79	0.23	1.28	1.1	0.26	0.11
4	40.77	3.24	2.15	3.66	32.82	1.26	0.75	1.06	14.29	0.07
5	35.26	56.31	3.1	2.36	1.23	0.23	0.19	0.05	1.25	0.02
6	42.14	1.25	1.23	3.12	29.46	1.89	3.82	1.1	15.66	0.33
7	20.89	1.89	39.36	29.02	2.89	1.64	2.35	1.42	1.22	0.04

Fig. 9 Cross-section morphologies of the pre-oxidized GH4169 alloy with the solid NaCl in wet O2 condition at 600 °C for 2 h a, 3 h b, 5 h c and 10 h d

Fig. 10 XRD of the pre-oxidized GH4169 alloy with solid NaCl deposited in wet O2 condition at 600 °C for 2 h, 3 h, 5 h, and 10 h

Fig. 11 Elemental mapping of the corrosion scale for the pre-oxidized GH4169 alloy with the solid NaCl deposited in wet O2 condition at 600 °C for 2 h a, 3 h b, 5 h c and 10 h d

Fig. 12 Scale morphology and type of pre-oxidized GH4169 alloy corroded with solid NaCl deposited in wet O2 condition at 600 °C for 2 h determined by TEM. The low magnification morphology a and SAED of Spot 1 b and Spot 2 e, and higher magnification image of the selected region c and corresponding HRTEM d

Fig. 13 Scale morpology and type of pre-oxidized GH4169 alloy corroded with solid NaCl deposited in wet O2 condition at 600 °C for 3 h determined by TEM. Low magnification morphology a and HRTEM of the selected region b, SAED of Spot 1 c and Spot 2 d

Fig. 14 Scale morphology and type of pre-oxidized GH4169 alloy corroded with solid NaCl deposited in wet O2 condition at 600 °C for 5 h determined by TEM. Low magnification morphology a and elemental line scan of the scale b, SAED of Spot 1 c, Spot 2 d and Spot 3 e

Fig. 15 Scale morphology and type of pre-oxidized GH4169 alloy corroded with solid NaCl deposited in wet O2 condition at 600 °C for 10 h determined by TEM. The low magnification morphology a, SAED of Spot 1 b, Spot 2 c and Spot 3 d

Fig. 16 Elemental line scan of pre-oxidized GH4169 alloy corroded with solid NaCl deposited in wet O2 condition at 600 °C for 2 h determined by TEM. TEM image of the outer Cr2O3 layer a, transversal line scan of Cl element b and longitudinal line scan of Cl element c

Fig. 17 Open circuit potential a and potentiodynamic polarization plot b of the pre-oxidized GH4169 alloy exposed with the solid NaCl in wet O2 condition at 600 °C

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