Abstract Recent high temperature H2S corrosion study reported that a thermodynamically less stable iron oxide layer can also form in addition to iron sulfide. In this work, H2S corrosion experiments were conducted at 120 °C for different exposure times, ranging from 1 to 21 days. The inner layer was identified by Transmission Electron Microscopy (TEM) as Fe3O4 (magnetite); Fe3O4 was always present over time despite it being less stable than iron sulfide. The observed formation sequence of iron sulfide at high temperature was mackinawite → troilite → pyrrhotite → pyrite. The role of the different corrosion product layers in corrosion is discussed.

中文翻译：

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高温下氧化铁和硫化铁的形成及其对腐蚀的影响

摘要 最近的高温 H2S 腐蚀研究报告称，除了硫化铁外，还可以形成热力学稳定性较差的氧化铁层。在这项工作中，H2S 腐蚀实验是在 120 °C 下进行的，暴露时间从 1 天到 21 天不等。内层经透射电子显微镜 (TEM) 鉴定为 Fe3O4（磁铁矿）；尽管 Fe3O4 不如硫化铁稳定，但随着时间的推移它总是存在。高温下观察到的硫化铁形成顺序为麦金诺矿→硫沸石→磁黄铁矿→黄铁矿。讨论了不同腐蚀产物层在腐蚀中的作用。