Diffusion of iron in Cr2O3: polycrystals and thin films

High temperature oxidation behavior of the AISI 430A and AISI 430E stainless steels in Ar/H2/H2O atmosphere

“…The amount of Mn on the top of the film is limited by the small amount of Mn in the steel, compared to chromium content, and may form a spinel oxide. The authors have shown that chromia does not act as a barrier for iron diffusion 10 . Therefore, the iron found in the film can be due either to the iron diffusion from the metallic substrate into the chromia film, or to iron detected in the substrate.…”

Cr as a key factor for direct synthesis of multi-walled carbon nanotubes on industrial alloys

“…In the present case, the catalyst particles should be the nanoparticles of Fe because the dominant component in SUS316 is Fe. It was reported that Fe can diffuse through the surface layer of oxidized Cr of stainless steel toward outermost surface at a elevated temperature [31] Fig. 7.…”

Improving Corrosion Behavior in SCWR, LFR and VHTR Reactor Materials by Formation of a Stable Oxide

“…Moreover, Cr Z 03 was observed at the inner oxide-diffusion layer interface, where the fluorescence data showed chromium enrichment. The presence of Cr203 along with chromium enrichment at the inner oxide-diffusion layer interface makes this interface play an active role in the corrosion resistance since Cr203 is known to hinder diffusion of oxygen and iron ions [13,14]. Figure 8 shows the diffraction data for 9CrODS 600°C 2 weeks acquired with a 0.2 I!m step-size.…”

“…It has been proposed that they reduce the amount of chromium needed to form Cr203, thus making it easier to form Cr203 in alloys containing lower chromium contents than would be necessary to form Cr203 [21]. Furthermore, it has been proposed that the ODS particles can serve as nucleation sites for the oxide and thus help form Cr203 [25].The formation of Cr 2 03 is important for corrosion resistance since it slows down the diffusion of oxygen and iron [13,14]. Second, yttrium has been shown to segregate at oxide grain boundaries thus inhibiting oxide grain growth and slowing down diffusion processes [10,21,25].…”

“…It is likely this continuous Cr 2 03 present at the film-metal interface was responsible for almost stopping the diffusion of oxygen beyond the film, thus inhibiting further oxidation of the metal [13). Cr203 has been shown to serve both as a kinetic and thermodynamic oxidation barrier since the diffusion of species is slow through Cr203 but it also decreases the oxygen potential on the inner interface, thus hindering oxidation ofthe metal [14). Additionally, a TEM investigation confirmed the presence of this Cr203 film [16).…”