The Effect of H2 and H2O on the Oxidation of 304L-Stainless Steel at 600 °C: General Behaviour (Part I) (original) (raw)

The effect of p(H 2 O) and p(H 2) on the oxidation of 304L stainless steel at 600°C has been investigated in the present study. The samples were analysed by means of X-ray diffraction, Auger spectroscopy, and scanning electron microscopy equipped with energy dispersive spectroscopy. The results showed that at fixed p(H 2), the corrosion rate increased considerably with increasing p(H 2 O). At fixed p(H 2 O), the corrosion rate decreased slightly with increasing p(H 2). Duplex oxide scales formed during the exposure in all environments. The outer and inner layer consisted of Fe 3 O 4 and (Fe, Cr) 3 O 4 , respectively. The latter was mainly in the form of internal oxidation. The Cr-rich oxide formation was observed at the initial oxidation process before oxide breakdown. The Auger analysis also suggested the presence of Cr-rich oxide layer just after the breakaway oxidation. The results indicated that the rate-determining step in the corrosion attack is surface controlled or diffusion controlled through an oxide layer with fixed thickness over time.

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