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 per- meation 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 diffu- sion coefficient; the effective hydrogen diffusion coefficient (Deff) was calculated by Fourier meth- od, modified Laplace method and time-lag method respectively, which give an average value 1.49× 10 -7 cm 2 ·s -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 ef- fect of anodic dissolution and hydrogen evolution under thesoftpolarization conditions; howev- er, if the polarized potentials were extremely negative, the concentration of hydrogen would in- crease sharply, as a result, the X65 steel became sensitive to hydrogen embrittlement.
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