热流科学与工程教育部重点实验室(西安交通大学)
纸质出版:2025
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何闯, 梁志远, 郭亭山, 等. 工质纯度对超临界CO2下材料腐蚀行为影响规律[J]. 中国电机工程学报, 2025,(14):5358-5369.
何闯, 梁志远, 郭亭山, 等. 工质纯度对超临界CO2下材料腐蚀行为影响规律[J]. 中国电机工程学报, 2025,(14):5358-5369. DOI: 10.13334/j.0258-8013.pcsee.241466.
超临界二氧化碳(supercritical carbon dioxide
S-CO )能够显著提升循环发电效率而受到学术界的广泛关注,然而高温材料的耐腐蚀性能是限制机组效率的主要因素,要求耐热钢能够满足发电设备的安全运行需求。该文选取3种耐高温材料(铁素体耐热钢T91、奥氏体不锈钢304和镍基高温合金617),探究3种耐热材料在600℃、15 MPa的研究级和工业级S-CO
2
环境下500 h的腐蚀行为。利用腐蚀动力学增重曲线、电子显微镜(scanning electron microscope
SEM)、分析能谱(energy dispersive spectrometer
EDS)、X射线衍射仪(X-Ray diffraction
XRD)和Raman图谱对腐蚀产物进行表征。结果表明:T91和304在工业级S-CO
2
下的腐蚀增重量均大于研究级S-CO
2
;T91的双层氧化膜由外层Fe
3
O
4
和内层(Fe
Cr)
3
O
4
组成,在工业级S-CO
2
腐蚀下氧化膜中出现Fe
2
O
3
;304和617氧化膜是单层Cr
2
O
3
氧化物,能较好地阻止杂质气体的腐蚀和渗碳反应的发生,因此研究级与工业级S-CO
2
下腐蚀差异较小。结果可为S-CO
2
机组的选材和预防腐蚀提供一定参考。
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