Effect of hydrogen on the passivation for ultra-thin 316 L SS foil

Effect of hydrogen on the passivation for ultra-thin 316 L SS foil

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Abstract The reformation and characterisation of the passive film formed on ultra-thin 316 L after hydrogen charging is investigated by black knight darts combining EBSD, TMDS, XRD, Synchrotron-based XPS, and electrochemical experiments.The results show that ultra-thin foil reforms a passive film after 12 h of hydrogen release in NaCl solution.The reformed passive film is half the thickness of the as-received passive film and is dominated by Cr oxides/hydroxides.

The lattice extension caused by residual hydrogen accelerates Cr migration to form Cr2O3; while red prairie spy apple the diffusible hydrogen occupies the cation vacancies and results in high defect density for the reformed passive film within 12 h.