Influence of Cathodic Polarization on Hydrogen Embrittlement Susceptibility of 10CrNi5MoV Steel in Simulated Shallow-sea and Deep-sea Environment

doi:10.11902/1005.4537.2025.060

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (6): 1599-1609 DOI: 10.11902/1005.4537.2025.060

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Influence of Cathodic Polarization on Hydrogen Embrittlement Susceptibility of 10CrNi5MoV Steel in Simulated Shallow-sea and Deep-sea Environment

XIANG Qifeng, ZHAO Yang(

), ZHANG Tao, WANG Fuhui

State Key Laboratory of Digital Steel, Northeastern University, Shenyang 110819, China

Cite this article:

XIANG Qifeng, ZHAO Yang, ZHANG Tao, WANG Fuhui. Influence of Cathodic Polarization on Hydrogen Embrittlement Susceptibility of 10CrNi5MoV Steel in Simulated Shallow-sea and Deep-sea Environment. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1599-1609.

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Abstract

10CrNi5MoV low-alloy high-strength steel may experience severe hydrogen embrittlement in deep-sea environment, while subjected to stress and cathodic protection. Hence, the hydrogen embrittlement susceptibility of 10CrNi5MoV high-strength steel in the simulated shallow sea (0 m) and deep sea (1000 m) environments by applied polarization potentials was assessed via potentiostat, electrochemical impedance spectroscopy (EIS), slow strain rate tensile (SSRT) and scanning electron microscopy (SEM). With the applied cathodic polarization potential negatively dropped from open circuit potential to -1050 mV, the hydrogen embrittlement susceptibility coefficient of the steel is about 25% in the shallow sea environment. However, which in the deep-sea environment reaches 59.7%. Although the corrosion and hydrogen evolution reactions are suppressed to certain extent in the deep-sea environment, whereas the diffusion of hydrogen atoms inwards the material is promoted, therewith the hydrogen embrittlement susceptibility of the steel is enhanced under cathodic protection.

Key words: 10CrNi5MoV steel deep-sea environment cathodic polarization hydrogen embrittlement susceptibility slow strain rate tensile

Received: 23 February 2025 32134.14.1005.4537.2025.060

ZTFLH:

TG174

Corresponding Authors: ZHAO Yang, E-mail: zhaoyang7402@mail.neu.edu.cn

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	XIANG Qifeng
	ZHAO Yang
	ZHANG Tao
	WANG Fuhui

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.060 OR https://www.jcscp.org/EN/Y2025/V45/I6/1599

Fig.1 Schematics of low temperature high pressure SSRT electrochemical system (1-gas inlet, 2- pressure meter, 3-thermocouple, 4- loading rod, 5- counter electrode,6- reference electrode)

Fig.2 Dimension (a) and pretreatment (b) of tensile specimen for SSRT (1- Al₂O₃ ceramics packing, 2- silicone, 3- working electrode)

Fig.3 Microstructure of the as-received 10CrNi5MoV steel (a) SEM image of secondary electron, (b) optical morphology of metallographic structure

Fig.4 Cathode polarization curves of 10CrNi5MoV steel in simulated shallow-sea and deep-sea environments

Fig.5 Nyquist (a, c) and Bode (b, d) plots of 10CrNi5-MoV steel at OCP and different cathodic polarization potentials in the simulated shallow-sea (a, b) and deep-sea (c, d) environment

Fig.6 Equivalent circuit for EIS date at OCP and different cathodic polarization potentials: (a) OCP, -850, -950 mV; (b) -1050 mV

Table 1 Fitting parameters of EIS date of 10CrNi5MoV steel at different cathodic polarization potentials in the shallow- and deep-sea environment

Fig.7 Charge transfer resistance (R_t) of 10CrNi5MoV steel in the simulated deep-sea environment at different potentials

Fig.8 Stress-strain curves of 10CrNi5MoV steel at OCP and different cathodic polarization potentials in the shallow-sea (a) and deep-sea (b) environment

Fig.9 Hydrogen embrittlement sensitivity of 10CrNi5MoV steel at OCP and different cathodic polarization potentials in the shallow-sea (a) and deep-sea (b) environment

Fig.10 Fracture surface morphologies of 10CrNi5MoV steel after SSRT test at OCP (a1, b1) and -850 mV (a2, b2), -950 mV (a3, b3), -1050 mV (a4, b4) cathodic polarization potentials in the shallow-sea environment

Fig.11 Fracture surface morphologies of 10CrNi5MoV steel after SSRT test at OCP (a1, b1) and -850 mV (a2, b2), -950 mV (a3, b3), -1050 mV (a4, b4) cathodic polarization potentials in the deep-sea environment

Fig.12 Side surface morphologies of 10CrNi5MoV steel after SSRT test at OCP (a) and -850 mV (b), -950 mV (c), -1050 mV (d) cathodic polarization potentials in the shallow-sea environment

Fig.13 Side surface morphologies of 10CrNi5MoV steel after SSRT test at OCP (a) and -850 mV (b), -950 mV (c), -1050 mV (d) cathodic polarization potentials in the deep-sea environment

Fig.14 Schematic diagram of the crack propagation of 10CrNi5MoV steel at cathodic polarization in the simulated shallow-sea environment

Fig.15 Schematic diagram of the crack propagation of 10CrNi5MoV steel at cathodic polarization in the simulated deep-sea environment

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