Corrosion Behavior of 2205 Steel in Simulated Hydrothermal Area

doi:10.11900/0412.1961.2017.00472

Acta Metall Sin

2018, Vol. 54

Issue (8): 1094-1104 DOI: 10.11900/0412.1961.2017.00472

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Corrosion Behavior of 2205 Steel in Simulated Hydrothermal Area

Shaopeng QU¹(

), Baizhang CHENG¹, Lihua DONG¹, Yansheng YIN¹, Lijing YANG²

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

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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.

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Abstract

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.

Key words: 2205 steel hydrothermal area temperature corrosion electrochemistry

Received: 10 November 2017

ZTFLH:

TG172.5

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)

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	Shaopeng QU
	Baizhang CHENG
	Lihua DONG
	Yansheng YIN
	Lijing YANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00472 OR https://www.ams.org.cn/EN/Y2018/V54/I8/1094

Fig.1 OM image of 2205 steel

Fig.2 Schematic of electrochemical measurement system (1—thermocouple (heating resistor ring), 2—thermocouple (solution), 3—liquid inlet (with valve), 4—heating resistor ring, 5—liquid outlet (with valve), 6—liquid inlet (with valve), 7—Pt electrode, 8—sample, 9—salt bridge, RE—reference electrode, WE—work electrode, CE—counter electrode)

Fig.3 Open circuit potentials (E) of 2205 steels in 20 MPa hydrostatic pressure 3.5%NaCl solution with different temperatures

Fig.4 Electrochemical impedance spectroscopies (EIS) of 2205 steels in 20 MPa hydrostatic pressure 3.5%NaCl solution with different temperatures

Fig.5 Equivalent circuit for electrochemical impedance spectroscopy results (R(QR(RQ))) (R_s—solution resistance, R_t—charge transfer resistance, R_pit—pit resistance, Q_dl—double layer capacitance, Q_pit—pit capacitance)

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)

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)

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)

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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