低氧压预氧化对FeCrAlSiY合金耐LBE熔液腐蚀性能的影响

为进一步提高核反应堆系统的结构材料 Fe-Cr 基合金抗 LBE 腐蚀的性能，对其进行成分优化和表面处理十分重要。 对 Fe-12Cr-xAl-2Si-0.6Y 合金进行低氧压预氧化试验，分析并讨论氧分压和 Al 含量对合金预氧化产物的影响，并研究预氧化前后的合金在 LBE 合金熔液中的耐腐蚀性能。结果表明，Fe-12Cr-2Al-2Si-0.6Y 合金在不同氧分压下进行预氧化后生成的表面氧化物均以 Al2O3 为主，氧分压越大，合金表面发生选择性氧化速度越快。不同 Al 含量的 Fe-12Cr-xAl-2Si-0.6Y 合金在 10^?15 atm(1 atm=0.101 3 MPa)氧分压下进行预氧化，随着 Al 含量的增加，合金表面氧化物由以 Cr₂O₃为主逐渐变为以 Al₂O₃ 为主，还混合有少量复合氧化物。进行低氧压预氧化处理能有效提高合金在 450 o C 的 LBE 合金熔液中的耐腐蚀性能。研究成果可为设计和开发耐 LBE 熔液腐蚀的 FeCrAlSiY 合金提供参考，促进该体系合金在核电工业领域的运用。

Effect of Low Oxygen Pressure Pre-oxidation on LBE Molten Corrosion Resistance of FeCrAlSiY Alloy

In order to further improve the LBE corrosion resistance of Fe-Cr based alloy, which is the structural material of nuclear reactor system, it is very important to optimize its composition and surface treatment. The low oxygen pressure pre-oxidation experiment of Fe-12Cr-xAl-2Si-0.6Y alloy are carried out. The effects of oxygen pressure and Al content on the pre-oxidation products of the alloy are analyzed and discussed, and the corrosion resistance of the alloy in LBE alloy melt with and without pre-oxidation are studied. The results show that the surface oxides of Fe-12Cr-2Al-2Si-0.6Y alloy are mainly Al₂O₃, the higher the oxygen partial pressure is, the faster the selective oxidation occurs on the alloy surface. Fe-12Cr-xAl-2Si-0.6Y alloy with different Al content is pre-oxidized under 10^?15 atm oxygen partial pressure. Accompanied by increase of Al content, the surface oxide of the alloy gradually changes from Cr₂O₃ to Al₂O₃ with a mixture of a small amount of composite oxide. Low oxygen pressure pre-oxidation treatment can effectively improve the corrosion resistance of the alloy in 450 o C LBE alloy melt. This paper can provide a reference for the design and development of FeCrAlSiY alloy resistant to LBE melt corrosion, and promote the application of this system alloy in the field of nuclear power industry.