Abstract
The effect of permeated hydrogen on the pitting behavior of type 304 stainless steel was investigated using a Devanathan type cell. One side of the stainless steel sheet was galvanostatically charged with hydrogen, while the other side was subjected to pitting tests. The permeated hydrogen typically enhanced the pitting susceptibility of the stainless steel; the pitting potential during potentiodynamic polarization became less noble and the induction period for pitting became shorter. However, the permeated hydrogen did not change the critical pitting potential determined potentiostatically. The effect of permeated hydrogen on the pitting potential and the induction period diminished after hydrogen charging was stopped. Analysis by X-ray photoelectron spectroscopy showed that the cationic fraction of chromium in a hydrogen-charged passive film was lower than that in an uncharged film. Thus, the permeated hydrogen is thought to suppress the aging process of the passive film with respect to enrichment of chromium.
Published Version
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