Understanding the excellent corrosion resistance of Fe-12Cr ODS alloys with and without Si in supercritical CO2 through advanced characterization

• Published in: Corrosion science 2023-01, Vol.210, p.110827, Article 110827
• Main Authors: Wang, You, Zhou, Zhangjian, Jia, Haodong, Gao, Rui, Ran, Minrui, Zheng, Wenyue, Zhang, Mengchao, Li, Hui, Zhang, Jianqiang, Zeng, Xiaoqin, Shen, Zhao
• Format: Article
• Language: English
• Subjects: Corrosion; ODS alloy; Supercritical carbon dioxide; TEM; TKD
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2022.110827

In this study, the corrosion properties of Fe-12Cr oxide dispersion strengthened (ODS) alloys with and without Si in 650 ℃ supercritical carbon dioxide were studied by multiple characterization techniques. The results show that although the Fe-12Cr ODS alloy without Si exhibits excellent corrosion resistance, the addition of Si can further result in a 10-times slower of corrosion rate without the formation of a SiO2 healing layer. The mechanisms of Si addition on the further improved corrosion resistance of the Fe-12Cr ODS alloys have been discussed in detail by multiple characterization results. •Fe-12Cr ODS alloys with and without Si are oxidized in 650 ℃ supercritical carbon dioxide.•1 wt% Si addition results in a 10-times decrease of the corrosion rate without the formation of a SiO2 layer.•Corrosion resistance is increased by the increased grain boundary density and nano-oxides number density.•Si plays a different effect in the ODS alloys and the traditional alloys.