ATF用ODS-FeCrAl管材的耐腐蚀性能研究  

Study on Corrosion Resistance of ODS-FeCrAl Tube for ATF

作　　者：李静[1,2] 吴飒建[1,2] 杨英 熊良银 马海滨[3] 刘实 Li Jing;Wu Sajian;Yang Ying;Xiong Liangyin;Ma Haibin;Liu Shi(Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China;Key Laboratory of Nuclear Materials and Safety Assessment,Chinese Academy of Sciences,Shenyang,110016,China;China Nuclear Power Technology Research Institute,Shenzhen,Guangdong,518000,China)

机构地区：[1]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016 [2]中国科学院核用材料与安全评价重点实验室,沈阳110016 [3]中广核研究院有限公司,广东深圳518000

出　　处：《核动力工程》2021年第4期119-125,共7页Nuclear Power Engineering

基　　金：沈阳市双百工程重大科技研发课题(Y17-0-022);事故容错燃料研发项目(TF15AM-RL-PS-000003)。

摘　　要：针对尺寸为Φ9.5 mm×0.3 mm的氧化物弥散强化(ODS)-FeCrAl管材在360℃/18.6 MPa/100 d静态水溶液、360℃/18.6 MPa/1200 ppm B+2.2 ppm Li/100 d(1 ppm=10-6)动态水溶液、1200℃/0.1 MPa/8 h水蒸气中的腐蚀行为进行研究,利用扫描电镜(SEM)、X射线光电子能谱(XPS)和X射线衍射(XRD)等检测方法,分析管材表面氧化膜形貌、组织结构和元素分布。结果表明,360℃水溶液中极低的氧浓度使得ODS-FeCrAl管材在静态和动态水溶液的腐蚀产物主要是Fe_(3)O_(4),质量增重分别为0.036 mg/cm^(2)和0.36 mg/cm^(2),氧化膜厚度分别为管壁厚度的0.072%和0.72%;1200℃水蒸气腐蚀时,高温和充足的氧含量促使管材表面生成平均厚度为2.34μm的α-Al_(2)O_(3)膜,延缓基体进一步氧化;腐蚀后的氧化膜表面和截面未发现开裂、孔洞等缺陷。与Zr-4管材参比试样相比,ODS-FeCrAl管材表现出优异的高温抗氧化、抗腐蚀性能。Oxide dispersion strengthened(ODS)FeCrAl alloy is one of the candidate materials for Accident Tolerant Fuel(ATF)cladding tubedue to its excellent mechanical strength,creep resistance and radiation-swelling resistance at elevated temperatures.The corrosion behaviors of ODS-FeCrAl tube with 9.5 mm outside diameter and 0.3 mm wall thickness in static water at 360℃and18.6 MPa for 100 days,in flowing aqueous solution containing 1200 ppm B and 2.2 ppm Li at 360℃and 18.6 MPa for 100 days and in steam at 1200℃and 0.1 MPa for 8 hours,were studied herein.The morphology,composition and element distribution of oxide film were analyzed by SEM,XPS and XRD respectively.The corrosion products are mainly Fe3O4,due to the low oxygen content in both aqueous environments at 360℃.And the weight gain is 0.036 mg/cm^(2) and 0.36 mg/cm^(2),which corresponding oxide film thickness is 0.072%and 0.72%of that of tube wall respectively.In the steam at 1200℃,owing to high temperature and sufficient oxygen content,α-Al_(2)O_(3) oxide film with a mean thickness of 2.34μm is dominant on the surface,delaying further the oxidation of the matrix.No observable cracks and voids are identified on the surface and the cross section of oxide filmsin all corrosive environments.In comparison with Zr-4 reference cladding,ODS-FeCrAl tube exhibits an outstanding high temperature oxidation and corrosion resistance.

关 键 词：ODS-FeCrAl管材 腐蚀 360℃水化学 1200℃水蒸气 氧化膜 

分 类 号：TL341[核科学技术—核技术及应用]