Abstract A detailed thermodynamic assessment has for the first time shown that the rapid oxide film formation on stainless steels subjected to the natural air atmosphere at room temperature is actually facilitated by “oxygen dissolution induced surface directed spinodal decomposition” in the Fe-Cr-O solid solution. The proposed mechanism has led to a clear explanation of the following until now un-explained observations: i) complete compositional stratification involving a sub-surface segregation of Cr atoms within the oxide film on stainless steels; ii) necessity of a minimum of about 11 at.% Cr in stainless steels for rapid passivation characteristics.

中文翻译：

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不锈钢中氧溶解诱导表面定向旋节线分解形成的室温氧化膜

摘要 详细的热力学评估首次表明，在室温下，在自然空气环境下，不锈钢上的快速氧化膜形成实际上是由 Fe-Cr-O 固体中的“氧溶解诱导表面定向旋节线分解”促进的。解决方案。所提出的机制清楚地解释了以下迄今为止无法解释的观察结果：i) 完整的成分分层，涉及不锈钢氧化膜内 Cr 原子的亚表面偏析；ii) 为了快速钝化特性，不锈钢中至少需要约 11 at.% 的 Cr。