Transpassivation-induced structural evolution of oxide film on 654SMO super austenitic stainless steel
Source abstract
Abstract
Compared to the well-recognition of passivation, the events occurring during transpassivation is insufficiently understood. Here, by means of aberration-corrected transmission electron microscopy, we show that transpassivation induces the oxide film on the 654SMO super austenitic stainless steel thickening to 50–70 nm. Chromium oxide is dominant in the thickened film and distributes homogeneously along the in-depth direction. Metal nitrides is indicated to be formed in the thickened film by the evident incorporation of N with negative valence. This work shows a more possibilities to the film modification by transpassivation than the general consensus that chromium is oxidized to higher-valence soluble ions.
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Research context
OpenAlex topics: Hydrogen embrittlement and corrosion behaviors in metals · Nuclear Materials and Properties · High-Temperature Coating Behaviors
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