|
| Corrosion Behavior of SIMP Steel in High Temperature Liquid Lead-bismuth Alloy |
| Received:October 18, 2023 Revised:November 21, 2023 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2024.02.016 |
| KeyWord:SIMP steel liquid lead-bismuth corrosion high temperature oxide layer corrosion products |
| Author | Institution |
| GAO Xiong |
Tribology Research Institute, Southwest Jiaotong University, Chengdu , China |
| HE Bin |
Tribology Research Institute, Southwest Jiaotong University, Chengdu , China |
| YU Lei |
Tribology Research Institute, Southwest Jiaotong University, Chengdu , China |
| WANG Yao |
Tribology Research Institute, Southwest Jiaotong University, Chengdu , China |
| LIU Xiaohong |
Tribology Research Institute, Southwest Jiaotong University, Chengdu , China |
| HU Tigang |
Tribology Research Institute, Southwest Jiaotong University, Chengdu , China |
| CAI Zhenbing |
Tribology Research Institute, Southwest Jiaotong University, Chengdu , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to study the change rule of corrosion products of SIMP steel after long-term immersion in high temperature liquid lead-bismuth alloys with different dissolved oxygen concentrations. The corrosion experiments of SIMP steel in 550 ℃ static liquid lead-bismuth alloy (saturated oxygen state and oxygen-poor state) were carried out for 500, 1 000, 2 000, 3 500 and 5 000 h. By observing the surface and cross-section morphology of the corroded specimens, the physical and chemical analysis was conducted, the changes in the thickness of the corrosion layer as well as the structure of the corrosion products at different time were compared, and the effect laws of the changes in dissolved oxygen concentration and immersion time on the corrosion products were derived. In the oxygen-poor environment, the corrosion type of SIMP steel was mainly oxidized corrosion, and the oxidized corrosion product had a two-layer structure, with the outer layer being the Fe-Cr spinel oxidized layer, and the inner layer being the mixture layer of chromium-rich oxides and the substrate. In the saturated oxygen environment, the corrosion product of SIMP steel had a three-layer structure, with the outer layer being the Fe3O4 magnetite layer, the middle layer being the Fe-Cr spinel oxidized layer, and the innermost layer being the mixture layer of chromium-rich oxides and the substrate. Changes in dissolved oxygen concentration and immersion time significantly affect the structure and thickness of the corrosion products, and SIMP steel shows excellent corrosion resistance in oxygen-poor environments. |
| Close |
|
|
|