Effect of dissolved oxygen on electrochemical corrosion behavior of 2205 duplex stainless steel in hot concentrated seawater

doi:10.1016/j.jmst.2020.06.030

Abstract

Abstract:

The corrosion behavior of 2205 duplex stainless steel was investigated in hot concentrated seawater with different dissolved oxygen (DO) concentration by electrochemical measurement techniques and surface analysis methods. DO obviously enhances the cathodic reaction process, the formation of passive film and polarization resistance. With increasing the DO concentration from 0.34 to 3.06 mg L^-1, the relative contents of Fe₂O₃ and Cr₂O₃ and the Cr-enrichment gradually enlarge in the passive film. The higher DO concentrations result in lower defect densities and thicker of space charge layers in the passive films, which may effectively inhibit the intrusion of aggressive chloride ions. The increment in DO concentration clearly increases the pitting potential, but decreases the repassivation potential. It may weaken both the occurrence and repassviation tendencies of stable pitting corrosion.

Key words: Dissolved oxygen, Pitting corrosion, 2205 duplex stainless steel, Hot concentrated seawater, Passivation

Hongtao Zeng, Yong Yang, Minhang Zeng, Moucheng Li. Effect of dissolved oxygen on electrochemical corrosion behavior of 2205 duplex stainless steel in hot concentrated seawater[J]. J. Mater. Sci. Technol., 2021, 66: 177-185.

Figures/Tables 16

Table 1 Chemical composition of 2205 DSS (wt.%).

C	P	S	Si	Mn	Cr	Ni	Mo	N	Fe
0.014	0.035	0.004	0.61	1.41	23.08	6.08	3.04	0.17	64.32

Table 2 Composition of the concentrated artificial seawater used in the tests (g L-1).

NaCl	MgCl₂	Na₂SO₄	CaCl₂	KCl	NaHCO₃	KBr
49.06	10.4	8.18	2.32	1.39	0.402	0.202

Fig. 1. Variation of CDO in the 2-times concentrated seawater at 72 °C with VO in the O2/N2 gas mixture.

Fig. 2. Variation of corrosion potential with time for the specimens immersed in the concentrated seawater with different CDO at 72 °C.

Fig. 3. Impedance plots (a) Nyquist and (b) Bode for the specimens in the concentrated seawater with different CDO at 72 °C. Symbols: experimental data; lines: fitted values.

Fig. 4. Cyclic anodic polarization curves for the specimens in the concentrated seawater with different CDO at.72 °C.

Table 3 Electrochemical parameters for 2205 DSS in the concentrated seawater with different CDO at.72 °C.

DO (mg L^-1)	E_p (mV_SCE)	i_p (μA cm^-2)	E_rp (mV_SCE)	d_max (μm)
0.34	298 ± 16.3	2.6 ± 0.5	32 ± 26.7	135.7 ± 8.0
0.53	330 ± 13.5	2.4 ± 0.4	-21 ± 19.7	184.3 ± 32.9
0.67	359 ± 4.4	2.3 ± 0.5	-26 ± 19.7	194.7 ± 11.6
0.81	390 ± 8.9	2.0 ± 0.3	-42 ± 14.6	232.3 ± 60.1
3.06	498 ± 6.6	1.6 ± 0.3	-54 ± 10.5	613.8 ± 123.7

Fig. 5. Cathodic polarization curves of the specimens in the concentrated seawater with different CDO at 72 °C.

Fig. 6. SEM morphologies of the specimen surfaces after cyclic anodic polarization in the concentrated seawater with different CDO at 72 °C: (a) 0.34 mg L-1; (b) 0.67 mg L-1; (c) 0.81 mg L-1; (d) 3.06 mg L-1.

Fig. 7. Mott-Schottky plots of passive films formed on 2205 DSS under different CDO in 2-times concentrated seawater at 72 °C.

Table 4 The acceptor and donor densities of passive films formed in the hot concentrated seawater.

C_DO (mg L^-1)	0.34	0.53	0.67	0.81	3.06
N_d (10²⁰ cm^-3)	2.62 ± 0.05	2.44 ± 0.07	2.35 ± 0.05	2.18 ± 0.12	1.83 ± 0.11
N_a (10²⁰ cm^-3)	3.46 ± 0.04	3.27 ± 0.06	3.02 ± 0.05	2.74 ± 0.1	2.68 ± 0.09

Fig. 8. The detailed XPS spectra of (a) Fe 2p3/2, (b) Cr 2p3/2, (c) O 1s and (d) Cl 2p3/2 for the passive films formed on the specimen surfaces at 0 VSCE in the concentrated seawater with different CDO. at 72 °C.

Fig. 9. Equivalent circuit for the electrode system of 2205 DSS/concentrated seawater under different CDO conditions.

Table 5 Fitted results of EIS spectra under different CDO conditions.

C_DO (mg L^-1)	R_s(Ω cm²)	C_f(μF cm^-2)	α_f	C_dl(μF cm^-2)	α_dl	R_p(kΩ cm²)	χ²(10^-4)
0.34	2.5 ± 0.1	96.1 ± 4.3	0.83 ± 0.05	56.7 ± 6.8	0.81 ± 0.01	329.0 ± 67.8	8.2 ± 5.1
0.53	2.1 ± 0.4	76.0 ± 1.3	0.83 ± 0.04	46.8 ± 4.2	0.84 ± 0.07	379.2 ± 23.4	9.7 ± 2.4
0.67	2.5 ± 0.1	64.3 ± 2.1	0.83 ± 0.05	44.4 ± 2.1	0.83 ± 0.01	393.4 ± 12.5	9.1 ± 1.1
0.81	2.5 ± 0.1	51.9 ± 6.0	0.90 ± 0.01	39.0 ± 2.2	0.84 ± 0.06	405.4 ± 16.4	8.4 ± 2.3
3.06	2.4 ± 0.4	46.1 ± 9.1	0.84 ± 0.05	31.9 ± 4.0	0.83 ± 0.07	426.1 ± 59.9	8.3 ± 1.1

Fig. 10. Thickness variation of the space charge layers in the anodic passive film formed at 0 VSCE in the hot concentrated seawater under different CDO conditions.

Fig. 11. Perfect (Erp-Ecorr) and imperfect passivity (Ep-Erp) ranges for 2205 DSS in the hot concentrated seawater with different CDO.

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