Hydrogen Permeation Behavior of X80 Steel under Cathodic Polarization and Stress

doi:10.11902/1005.4537.2014.155

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (4): 353-358 DOI: 10.11902/1005.4537.2014.155

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Hydrogen Permeation Behavior of X80 Steel under Cathodic Polarization and Stress

Wang GUO,Weimin ZHAO(

),Timing ZHANG,Tianhai DU,Yong WANG

School of Mechanical and Electrical Engineering, China University of Petroleum, Qingdao 266580, China

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Abstract

Hydrogen permeation behavior of X80 steel under applied cathodic polarization and stress in 3.5%NaCl+1 g/L Na₂S solution was studied by means of a modified D-S cell combined with slow strain rate tensile machine. The effect of polarization potential on hydrogen permeation behavior and the hydrogen evolution potential were acquired by hydrogen permeation test with changing polarization potential. Besides, potentiostatic polarization hydrogen permeation test under different stress levels was performed and then the hydrogen permeation parameters were calculated by the Laplace equation. Results show that under various stress levels, the steady-state hydrogen permeation current density increased as the cathodic polarization potential decreased, and the hydrogen evolution potential was lower than -1000 mV (vs SCE). In the stage of elastic strain, hydrogen trap density decreased and the apparent hydrogen diffusion coefficient increased. After entering the stage of plastic deformation, hydrogen trap density increased and the hydrogen diffusion coefficient gradually decreased due to the generation of dislocation. The concentration of adsorbed hydrogen shows a change tendency opposite to the hydrogen diffusivities.

Key words: cathodic polarization X80 steel hydrogen permeation stress

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	Wang GUO
	Weimin ZHAO
	Timing ZHANG
	Tianhai DU
	Yong WANG

Cite this article:

Wang GUO,Weimin ZHAO,Timing ZHANG,Tianhai DU,Yong WANG. Hydrogen Permeation Behavior of X80 Steel under Cathodic Polarization and Stress. Journal of Chinese Society for Corrosion and protection, 2015, 35(4): 353-358.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.155 OR https://www.jcscp.org/EN/Y2015/V35/I4/353

Fig.1 SEM image of X80 steel

Fig.2 Equipment for hydrogen permeation test

Fig.3 Cathodic polarization curve of X80 steel in 3.5%NaCl+1 g/L Na₂S solution

Fig.4 Hydrogen permeation current density vs time for X80 steel under 0% (a), 60% (b), 90% (c) and 110% (d) R_p0.2 tensile stress

Fig.5 Hydrogen permeation curves of X80 steel under various levels of tensile stress at -1100 mV

Table1 Hydrogen permeation parameters of X80 steel under various levels of tensile stress at -1100 mV

Fig.6 D_a-1000/t_p curves of X80 steel under various levels of tensile stress

Fig.7 Hydrogen trap density of X80 steel under various levels of tensile stress

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