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.

中文翻译：

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654SMO超级奥氏体不锈钢氧化膜过钝化诱导的结构演化

与对钝化的充分认识相比，对跨钝化过程中发生的事件的了解还不够。在这里，通过像差校正透射电子显微镜，我们发现转钝化导致 654SMO 超级奥氏体不锈钢上的氧化膜增厚至 50-70 nm。氧化铬在增厚膜中占主导地位，并沿深度方向均匀分布。通过明显掺入负价的N，表明在增厚的膜中形成了金属氮化物。这项工作表明，与铬被氧化成高价可溶离子的普遍共识相比，通过钝化对薄膜进行改性有更多的可能性。