Higher chromium containing 17Cr oxide dispersion strengthened (ODS) steel (Fe-16.78Cr-4.46Al-0.5Ti-0.45Y₂O₃-0.36Y) with the ferritic structure are a prospective applicant fuel cladding materials for the high operating temperatures of future advanced nuclear reactors system. In this study, the microstructure, passive oxide composition and corrosion resistance of the Al-containing 17Cr ODS steel in different concentrations of nitric acid were investigated by means of SEM, TEM, XPS and electrochemical methods. The corrosion result shows that with increasing concentration of 3 M–11.5 M HNO₃, open circuit potential revealed nobler potential and the potentiodynamic polarization plots exhibited a shift in corrosion potential toward transpassive region. The boiling nitric acid test after 240 h exposed in 3 M–11.5 M HNO₃ showed desirable corrosion rate of ∼0.075–0.25 mm/y. As the nitric acid concentration increased, the corrosion morphology varied from smaller pits to enlarged pits with groove-like features. The improved corrosion resistance of the ODS alloy is attributed to the alloy composition, nature of dispersed oxide and passive film nature, where Al₂O₃ is prominently enriched. The corrosion mechanisms of ODS steel is further discussed.

具有铁素体结构的含铬更高的17Cr氧化物弥散强化（ODS）钢（Fe-16.78Cr-4.46Al-0.5Ti-0.45Y ₂ O ₃ -0.36Y）是潜在的应用燃料覆层材料，适用于未来的高工作温度先进的核反应堆系统。通过SEM，TEM，XPS和电化学方法研究了不同浓度硝酸中含铝的17Cr ODS钢的显微组织，钝态氧化物组成和耐蚀性。腐蚀结果表明，随着HNO ₃浓度的增加，其浓度为3 M–11.5 M，开路电势显示出更高的电势，并且电位动力学极化图显示出腐蚀电势向过钝区移动。在3 M–11.5 M HNO _3中暴露240 h后的沸腾硝酸测试显示，理想的腐蚀速率为〜0.075–0.25 mm / y。随着硝酸浓度的增加，腐蚀形态从较小的凹坑到具有槽状特征的扩大的凹坑变化。ODS合金的改进的耐腐蚀性归因于合金成分，分散的氧化物的性质和钝化膜的性质，其中Al ₂ O ₃明显富集。进一步讨论了ODS钢的腐蚀机理。