Abstract The initial corrosion behaviour of austenitic TP347H exposed to supercritical water was investigated. The early oxidation can be categorized into three stages (rapid oxidation, transitory, and diffusion-controlled stages). Higher temperature resulted in a transformation towards the subsequent stage earlier and less oxidation resistance. Cr 6+ species (likely CrO 2 (OH) 2 ) were only generated on the surface in the very early phase, and then they gradually disappeared as the exposure time increased. Compared with a complete outer Fe-rich oxide layer, the formation priority of a continuous inner Cr-rich layer was observed at 540 °C within 35 h. A corresponding early oxidation process was determined.

中文翻译：

---

奥氏体不锈钢TP347H在超临界水中的早期氧化机理

摘要 研究了奥氏体TP347H暴露于超临界水中的初始腐蚀行为。早期氧化可分为三个阶段（快速氧化阶段、过渡阶段和扩散控制阶段）。较高的温度导致较早地向后续阶段转变并且抗氧化性较差。Cr 6+ 物种（可能是CrO 2 (OH) 2 ）仅在极早期阶段在表面生成，然后随着暴露时间的增加逐渐消失。与完整的外部富铁氧化物层相比，在 540°C 下 35 小时内观察到连续的内部富铬层的形成优先。确定了相应的早期氧化过程。