Abstract Aluminide diffusion coatings were applied on an oxide dispersion strengthened ferritic-martensitic (ODS-FM) steel as surface modification methods. Either thin layer of Al or NiAl was deposited on the ODS-FM steels, which were subjected to inter-diffusion heat treatment (IDHT) to produce Al-IDHTed or NiAl-IDHTed specimens, respectively. After corrosion test in high temperature super-critical carbon dioxide (S-CO2), both Al-IDHTed and NiAl-IDHTed specimens showed significantly improved corrosion resistance with lower weight gains and effectively supressed carburization in the matrix. The improvement in corrosion resistance was attributed to the presence of continuous alumina layer on top of surface layer. For Al-IDHTed specimen, extensive diffusion of Al from surface layer and inter-diffusion zone to substrate was observed after the S-CO2 corrosion test. However, for NiAl-IDHTed specimen, an Al-rich surface layer was well-maintained after S-CO2 corrosion as Ni acted as a diffusion barrier.

中文翻译：

---

在ODS铁素体-马氏体钢上开发铝化物扩散涂层在高温超临界-二氧化碳环境下耐腐蚀

摘要 铝化物扩散涂层作为表面改性方法应用于氧化物弥散强化铁素体-马氏体（ODS-FM）钢。在 ODS-FM 钢上沉积 Al 或 NiAl 薄层，对它们进行相互扩散热处理 (IDHT)，分别生产 Al-IDHTed 或 NiAl-IDHTed 试样。在高温超临界二氧化碳 (S-CO2) 中进行腐蚀试验后，Al-IDHTed 和 NiAl-IDHTed 试样均显示出显着提高的耐腐蚀性，重量增加较少，并有效抑制了基体中的渗碳。耐腐蚀性的提高归因于在表面层顶部存在连续氧化铝层。对于 Al-IDHTed 试样，在 S-CO2 腐蚀试验后，观察到 Al 从表面层和相互扩散区​​向基体的广泛扩散。然而，对于 NiAl-IDHTed 试样，由于 Ni 作为扩散屏障，在 S-CO2 腐蚀后，富铝表面层得到了很好的维护。