Repassivation behavior of alloy 690TT in simulated primary water at different temperatures

doi:10.1016/j.jmst.2020.06.044

Abstract

Abstract:

The repassivation behavior of Alloy 690 T T in simulated primary water at different temperatures was investigated by the rapid scratching electrode technique together with electrochemical measurements. The results showed that the repassivation process had three stages: the initial stage conformed to the place exchange model, the final stage conformed to the high field ion conduction model and in between there was a transition stage. At the initial stage, when the repassivation process of alloys was controlled by the place exchange model, anodic dissolution of substrate was dominated; after the film coverage rate was more than 0.99, the repassivation process of alloys was controlled by high field ion conduction model. Increasing the temperature resulted in a reduction of the repassivation rate and protectiveness of the passive film. The correlations among several mechanisms describing the repassivation behavior of alloys were discussed.

Key words: Repassivation, Electrochemistry, High temperature corrosion, Alloy 690TT, Electrochemical impedance spectroscopy

Ji Liu, Jianqiu Wang, Zhiming Zhang, Hui Zheng. Repassivation behavior of alloy 690TT in simulated primary water at different temperatures[J]. J. Mater. Sci. Technol., 2021, 68: 227-235.

Figures/Tables 13

Table 1 Chemical composition (in wt.%) of Alloy 690 T T used in this work.

Ni	Cr	Fe	Mn	Ti	S	P	C	N	Si	Cu	Co	Al
59.50	29.02	10.28	0.30	0.33	0.001	0.009	0.018	0.0234	0.31	0.010	0.015	0.16

Fig. 1. Schematic diagram of the scratching samples.

Fig. 2. Potentiodynamic polarization curves of Alloy 690 T T at different temperatures.

Fig. 3. The variation of the current density of Alloy 690 T T at different anodic potentials (potentiostat test) and temperatures.

Fig. 4. Transient current density curves of Alloy 690 T T at different temperatures. (a) curves of t vs i(t); (b) curves of log t vs log i(t).

Fig. 5. Morphology of the scratch. (a) 3D morphology by LSCM; (b) the cross section of the scratch by SEM; (c) the plan view of the scratch by SEM.

Fig. 6. EIS results of Alloy 690 T T at different temperatures. (a) Nyquist curves; (b) Bode curves.

Fig. 7. Mathematical analysis of transient current density curves of Alloy 690 T T at different temperatures. (a) Log i(t) vs q(t) curves; (b) log i(t) vs 1/q(t) curves; (c) the variation of the slope (cBV) of linear part in log i(t) vs 1/q(t) curves.

Table 2 Time scheme for the ending time of PEM & the starting time of HFM

T (°C)	Ending time of PEM (s)	Starting time of HFM (s)
200	0.862 ± 0.1134	5.708 ± 1.1512
225	1.188 ± 0.1439	6.901 ± 1.3862
250	2.140 ± 0.2121	10.253 ± 2.5519
275	2.738 ± 0.5001	11.487 ± 2.2428
300	3.598 ± 0.4371	12.563 ± 1.2656

Fig. 8. The fitting results of transient current density with Eq. (3) for Alloy 690 T T at different temperatures. (a) 200 °C; (b) 225 °C; (c) 250 °C; (d) 275 °C; (e) 300 °C.

Fig. 9. The time function curves of itot, ifilm, idiss and θ at different temperatures. (a) 200 °C; (b) 225 °C; (c) 250 °C; (d) 275 °C; (e) 300 °C.

Fig. 10. The time comparison of each stage about repassivation process analysis based on two mechanisms (place exchange model & high field ion conduction model, anodic dissolution & film formation) at different temperatures. (a) 200 °C; (b) 225 °C; (c) 250 °C; (d) 275 °C; (e) 300 °C.

Table 3 The fitting results and standard deviation of Alloy 690 T T at different temperatures

T (°C)	k (s^-1)	t (i_diss = i_film) (s)	t (θ>0.99) (s)	b	A (μC/cm²)
200	1.026 ± 0.002	1.948 ± 0.418	5.319 ± 0.704	0.632 ± 4E-4	6.76E-4 ± 1E-6
225	0.928 ± 0.002	2.164 ± 0.472	5.666 ± 0.749	0.667 ± 5E-4	7.54E-4 ± 1E-6
250	0.707 ± 0.001	2.308 ± 0.699	6.366 ± 1.315	0.669 ± 6E-4	6.23E-4 ± 1E-6
275	0.541 ± 0.001	2.710 ± 0.137	7.839 ± 0.303	0.648 ± 7E-4	1.34E-3 ± 3E-6
300	0.415 ± 0.001	3.519 ± 0.103	9.632 ± 0.547	0.631 ± 8E-4	1.25E-3 ± 4E-6

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