Susceptibility to Hydrogen Embrittlement of X65 Steel Under Cathodic Protection in Artificial Sea Water

doi:10.11902/1005.4537.2013.109

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (4): 315-320 DOI: 10.11902/1005.4537.2013.109

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Susceptibility to Hydrogen Embrittlement of X65 Steel Under Cathodic Protection in Artificial Sea Water

ZHANG Timing, ZHAO Weimin, GUO Wang, WANG Yong

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

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Abstract Hydrogen permeation behavior and its effect on cracking mechanism of X65 steel under cathodic polarization were studied in artificial seawater by means of electrochemical hydrogen permeation test and slow strain rate test (SSRT). Results show that the calcium magnesium deposits formed on the steel during cathodic polarization would significantly decrease the hydrogen diffusion coefficient; the effective hydrogen diffusion coefficient (D_eff) was calculated by Fourier method, modified Laplace method and time-lag method respectively, which give an average value 1.49×10^-⁷ cm²s^-¹; the hydrogen concentration (C₀) in the sub-surface of the steel showed an exponential relationship with the polarized potential; the crack propagation was influenced by the synergistic effect of anodic dissolution and hydrogen evolution under the “soft” polarization conditions; however, if the polarized potentials were extremely negative, the concentration of hydrogen would increase sharply, as a result, the X65 steel became sensitive to hydrogen embrittlement.

Key words: cathodic polarization X65 steel hydrogen permeation hydrogen embrittlement

Received: 07 June 2013

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ZHANG Timing, ZHAO Weimin, GUO Wang, WANG Yong. Susceptibility to Hydrogen Embrittlement of X65 Steel Under Cathodic Protection in Artificial Sea Water. Journal of Chinese Society for Corrosion and protection, 2014, 34(4): 315-320.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.109 OR https://www.jcscp.org/EN/Y2014/V34/I4/315

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