Effect of Cathodic Potentials on Hydrogen Embrittlement of 1000 MPa Grade High Strength Steel in Simulated Deep-sea Environment

doi:10.11902/1005.4537.2019.141

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (5): 409-415 DOI: 10.11902/1005.4537.2019.141

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Effect of Cathodic Potentials on Hydrogen Embrittlement of 1000 MPa Grade High Strength Steel in Simulated Deep-sea Environment

ZHOU Yu¹^,², ZHANG Haibing²(

), DU Min¹, MA Li²

1 College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
2 State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao 266237, China

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Abstract

The hydrogen embrittlement of a 1000 MPa grade high strength steel in simulated 800 m deep-sea environment and shallow sea environment by open circuit potential or applied various cathodic potentials was comparatively studied by means of slow strain rate tensile tests, potentiodynamic polarization measurements and SEM. Results showed that for the high strength steel, the open circuit potential was approximately -708 mV (vs Ag/AgCl/seawater) and the hydrogen evolution potentials was about -1000 mV (vs Ag/AgCl/seawater) in the simulated 800 m deep-sea environment. While the open circuit potential was approximately -645 mV (vs Ag/AgCl/seawater) and the hydrogen evolution potentials was about -910 mV (vs Ag/AgCl/seawater) in the shallow sea environment. With the cathodic polarization potential dropped from -800 mV to -1000 mV, the toughness of the tested high-strength steel was reduced, i.e. the brittleness was increased, implying that the susceptibility to hydrogen embitterment was enhanced. When the polarization potential was higher than -900 mV, the hydrogen embrittlement coefficient of high-strength steel was less than 25%, namely, the steel is still in the safe range. When the polarization potential reached further to -1000 mV, the hydrogen embrittlement coefficient increased to about 50%, which was in the brittle fracture range for the steel.

Key words: simulated deep sea environment high strength steel hydrogen embrittlement cathodic potential slow strain rate test

Received: 02 September 2019

ZTFLH:

TG174.3

Corresponding Authors: ZHANG Haibing E-mail: zhanghb@sunrui.net

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ZHOU Yu, ZHANG Haibing, DU Min, MA Li. Effect of Cathodic Potentials on Hydrogen Embrittlement of 1000 MPa Grade High Strength Steel in Simulated Deep-sea Environment. Journal of Chinese Society for Corrosion and protection, 2020, 40(5): 409-415.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.141 OR https://www.jcscp.org/EN/Y2020/V40/I5/409

Fig.1 Shape and size of the sample used in slow strain rate tensile test

Fig.2 Polarization curves of high-strength steel in simulated shallow sea and deep sea environments

Fig.3 Stress-strain curves of high-strength steel in air and simulated deep sea (a) and shallow sea (b) environ-ments at different cathodic polarization potentials

Fig.4 Dependences of loss percentage of area reduction (ψ) and hydrogen embrittlement coefficient (F_H) on potential for high-strength steel in simulated deep sea (a) and shallow sea (b) environments

Fig.5 Three-dimensional fracture morphologies of high-strength steel after tensile tests in air (a) and simulated deep sea environment at cathodic polarization potentials of OCP (b), -800 mV (c), -850 mV (d), -900 mV (e), -950 mV (f) and -1000 mV (g)

Fig.6 Three-dimensional fracture morphologies of high-strength steel after tensile tests in simulated shallow sea environment at cathodic polarization potentials of OCP (a), -800 mV (b), -850 mV (c), -900 mV (d), -950 mV (e) and -1000 mV (f)

Fig.7 SEM images of fracture surfaces of high-strength steel in air (a) and in simulated deep sea environment at various potentials of OCP (b), -800 mV (c), -850 mV (d), -900 mV (e), -950 mV (f) and -1000 mV (g)

Fig.8 SEM images of fracture surfaces of high-strength steel in shallow sea environment at various potentials of OCP (a), -800 mV (b), -850 mV (c), -900 mV (d), -950 mV (e) and -1000 mV (f)

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