1 College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China 2 Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Cite this article:
Shaopeng QU, Baizhang CHENG, Lihua DONG, Yansheng YIN, Lijing YANG. Corrosion Behavior of 2205 Steel in Simulated Hydrothermal Area. Acta Metall Sin, 2018, 54(8): 1094-1104.
Deep-sea hydrothermal area has a lot of mineral resources, and study the corrosion behavior of metal in deep-sea hydrothermal area is useful for marine resource development. Electrochemical impedance spectroscopy, linear polarization, potentiodynamic polarization and Mott-Schottky analysis were used to study the electrochemical properties of 2205 steel in 20 MPa hydrostatic pressure 3.5%NaCl solution with different temperatures. Corrosion morphologies and corrosion products of 2205 steel after electrochemical tests were analyzed by SEM, EDS and white light interferometry. The results show that 2205 steel has good pitting resistance under 25 ℃ in simulated hydrothermal area, pit occurred on the surface of 2205 steel after the solution temperature reaching 65 ℃, crack-shaped pit occurred on the surface of 2205 steel under 150 and 200 ℃. Pit occurs in austenite phase at 65 ℃, and occurs in ferrite phase at 100~200 ℃. Impedance and linear polarization resistance of 2205 steel first decrease and then increase with temperature increasing in simulated hydrothermal area, and impedance and linear polarization resistance under 150 ℃ are lowest. Pitting potential of 2205 steel first negative shift and then positive shift, and carrier density of passive film formed in simulated hydrothermal area increase with temperature increasing.
Fund: Supported by National Natural Science Foundation of China (No.51701115), National Basic Research Program of China (No.2014CB643306) and Foundation of Key Laboratory of Marine Materials and Applied Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences (No.2016K04)
Table 1 EIS fitting results of 2205 steel in 20 MPa hydrostatic pressure 3.5%NaCl solution with different temperatures
Fig.6 Linear polarizations of 2205 steels in 20 MPa hydrostatic pressure 3.5%NaCl solution with different temperatures (i—current density)
Fig.7 Potentiodynamic polarization curves of 2205 steel in 20 MPa hydrostatic pressure 3.5%NaCl solution with different temperatures (a) and with different dissolved oxygen (b)
Temperature
Ecorr
Eb
Ep
ip
℃
V
V
V
10-4 Acm-2
25
-0.504
0.964
0.288
1.00
65
-0.381
0.683
-0.121
2.65
100
-0.290
0.157
-0.062
2.43
150
-0.179
0.208
-0.070
2.29
200
-0.375
0.701
-0.207
4.38
Table 2 The electrochemical parameters of 2205 steel in 20 MPa hydrostatic pressure 3.5%NaCl solution with different temperatures
Fig.8 Mott-Schottky curves of 2205 steels in 20 MPa hydrostatic pressure 3.5%NaCl solution with different temperatures (C—charge capacitance)
Temperature
ND
NA
℃
1022 cm-3
1022 cm-3
25
10.60
15.53
65
24.36
48.65
100
20.90
37.91
150
68.49
-
200
81.96
-
Table 3 The carrier concentrations of the passive film of 2205 steel formed in 20 MPa hydrostatic pressure 3.5%NaCl solution with different temperatures
Fig.9 Surface morphologies of 2205 steels after corrosion in 20 MPa hydrostatic pressure 3.5%NaCl solution with different temperatures (a) 25 ℃ (b) 65 ℃ (c) 100 ℃ (d) 150 ℃ (e) 200 ℃
Fig.10 Backscatter electron images of surface of 2205 steel after corrosion in 20 MPa hydrostatic pressure 3.5%NaCl solution with different temperatures (a) 65 ℃ (b) 100 ℃ (c) 150 ℃ (d) 200 ℃
Fig.11 White light interference results of the pits of 2205 steel after electrochemical tests in 20 MPa hydrostatic pressure 3.5%NaCl solution with temperatures of 65 ℃ (a), 100 ℃ (b), 150 ℃ (c) and 200 ℃ (d)
Position
Ni
Si
Mo
Cr
Fe
O
2205
8.23
0.96
3.15
22.13
63.92
Ferrite
7.30
1.04
3.67
23.24
64.75
Austenite
11.45
0.88
2.94
20.89
63.85
65 ℃-out
8.26
0.89
2.99
22.30
61.16
?
100 ℃-out
8.30
1.15
3.29
22.34
60.22
?
150 ℃-out
10.03
0.97
2.37
19.84
62.88
?
200 ℃-out
10.36
1.19
3.11
24.21
42.99
13.05
65 ℃-pit
13.58
2.04
2.02
20.53
52.62
?
100 ℃-pit
12.47
0.84
2.30
19.74
60.64
?
150 ℃-pit
1.11
0.21
1.14
29.35
68.18
?
200 ℃-pit
2.60
0.33
1.38
40.39
50.85
3.31
Table 4 EDS results of the corrosion surfaces of 2205 steel after electrochemical tests in 20 MPa hydrostatic pressure 3.5%NaCl solution with different temperatures (mass fraction / %)
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