Fe13Cr5Al4Mo合金在高温高压水环境中的腐蚀行为
收稿日期: 2021-12-22
修回日期: 2022-03-27
网络出版日期: 2022-05-05
基金资助
国家自然科学基金项目(51871141)
Corrosion Behaviors of Fe13Cr5Al4Mo Alloy in High-Temperature High-Pressure Water Environments
Received date: 2021-12-22
Revised date: 2022-03-27
Online published: 2022-05-05
Supported by
National Natural Science Foundation of China(51871141)
利用XRD、SEM和TEM等测试技术研究了Fe13Cr5Al4Mo合金在360℃、18.6 MPa去离子水和360℃、18.6 MPa、3.5 mg/L Li + 1000 mg/L B水溶液中的腐蚀行为。结果表明，Fe13Cr5Al4Mo合金的腐蚀增重远低于参比锆合金，且腐蚀增重速率较慢，表明Fe13Cr5Al4Mo合金的耐腐蚀性能优于参比锆合金。在2种水环境下，Fe13Cr5Al4Mo合金表面均形成了一层Fe(Cr, Al)2O4纳米尖晶石结构的氧化膜，在去离子水中还产生了Fe3O4外层氧化颗粒。Fe(Cr, Al)2O4尖晶石氧化膜整体上较为致密，可以阻碍氧离子和金属阳离子在氧化膜内的扩散，提高合金的耐腐蚀性能。此外，高温高压水中添加Li + B导致Fe13Cr5Al4Mo合金的腐蚀增重和氧化膜厚度发生变化，且抑制了外层氧化颗粒的产生，这与Li + B水溶液较高的pH值和Li+、B3+的相互作用有关。
林晓冬 , 马海滨 , 任啟森 , 孙蓉蓉 , 张文怀 , 胡丽娟 , 梁雪 , 李毅丰 , 姚美意 . Fe13Cr5Al4Mo合金在高温高压水环境中的腐蚀行为[J]. 金属学报, 2022 , 58(12) : 1611 -1622 . DOI: 10.11900/0412.1961.2021.00574
FeCrAl alloys are promising candidate materials for accident-tolerant-fuel (ATF) claddings owing to their good high-temperature mechanical property, irradiation-swelling resistance, and high-temperature steam-oxidation performance. However, excellent corrosion resistance is also required in high-temperature high-pressure water environments when the alloys are used as ATF claddings. Therefore, in this work, the corrosion behavior of a Fe13Cr5Al4Mo alloy in 360oC, 18.6 MPa deionized water and 360oC, 18.6 MPa, 3.5 mg/L Li + 1000 mg/L B aqueous solution was studied. Results revealed that the weight gain and growth rate of the Fe13Cr5Al4Mo alloy were lower than that of the reference zirconium alloy, indicating a better corrosion property of the Fe13Cr5Al4Mo alloy. Moreover, an oxide film comprising Fe(Cr, Al)2O4 nanospinels formed on the Fe13Cr5Al4Mo alloy in both water environments, and Fe3O4 outer-oxide particles were observed in deionized water. The good corrosion performance of Fe13Cr5Al4Mo alloy was attributed to the compact spinel-oxide film, which could inhibit the diffusion of oxygen ions and metal cations. Adding Li + B into water changed the corrosion weight gain and oxide-film thickness of the Fe13Cr5Al4Mo alloy and impeded the formation of outer-oxide particles, which may be related to the high pH of alkaline Li + B aqueous solution and the interactions between Li+ and B3+.
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