Alumina is regarded as one of the most promising candidate tritium permeation barrier (TPB).Through thermal oxidization of Al-contained alloys Fe–Cr–Al, alumina layer with high tritium permeation reduction ability can be obtained. After bonding this kind of materials with structural materials such as reduced activation ferritic/martensitic (RAFM) steels, it can serve as TPB. In this work, efforts have been done to enhance the hydrogen isotope permeation reduction ability of the alumina layer on the Fe–Cr–Al ferritic steel by optimizing the oxidation process. The oxidation temperature of the Fe–Cr–Al ferritic steel is set to 973 K, which is lower than the final heat treatment temperature of the RAFM steel. Three different atmospheres have been employed for the oxidation process of the Fe–Cr–Al ferritic steel. Gas driven permeation (GDP) experiments have been performed to examine the deuterium permeability of the oxidized Fe–Cr–Al ferritic steel. The deuterium permeability of the Fe–Cr–Al ferritic steel oxidized in argon with 1700 ppm oxygen is 10⁴ times lower than that of the RAFM steel at 823 K. The microstructure and chemical composition of the oxide layer of the Fe–Cr–Al ferritic steel oxidized in three different atmospheres has been clarified using Scanning Electron Microscopy (SEM) and X-ray Photoelectron Spectroscopy (XPS) methods. It is suggested that oxidizing the Fe–Cr–Al ferritic steel at reduced oxygen atmosphere could inhibit the growth of the iron oxide and chromium oxide in the oxide layer, thereby leading to a dense and compact alumina layer that has excellent hydrogen permeation reduction performance.

氧化铝被认为是最有前途的候选candidate渗透阻挡层（TPB）之一。通过含铝合金Fe–Cr–Al的热氧化，可以获得具有高tri渗透减少能力的氧化铝层。将这种材料与还原活化的铁素体/马氏体（RAFM）钢等结构材料粘合后，可以用作TPB。在这项工作中，通过优化氧化过程，努力提高了Fe-Cr-Al铁素体钢上氧化铝层的氢同位素渗透还原能力。Fe–Cr–Al铁素体钢的氧化温度设置为973 K，低于RAFM钢的最终热处理温度。Fe-Cr-Al铁素体钢的氧化过程采用了三种不同的气氛。进行了气体驱动渗透（GDP）实验，以检查氧化的Fe-Cr-Al铁素体钢的氘渗透率。氩气中被1700 ppm氧气氧化的Fe–Cr–Al铁素体钢的氘渗透率是10在823 K时，比RAFM钢低⁴倍。使用扫描电子显微镜（SEM）和X射线阐明了在三种不同气氛下氧化的Fe-Cr-Al铁素体钢的氧化层的组织和化学成分光电子能谱（XPS）方法。建议在还原的氧气气氛下氧化Fe–Cr–Al铁素体钢可以抑制氧化层中氧化铁和氧化铬的生长，从而形成具有致密的氢渗透还原性能的致密而紧密的氧化铝层。