10Cr9Si1Mo1VNb钢在450℃静态铅铋中的腐蚀行为  

Corrosion Behavior of 10Cr9Si1Mo1VNb Steel in Static Lead-bismuth Eutectic at 450℃

作　　者：张钰慧 孟彬[1] 王立民[2] 唐正焮 何西扣[2] 吴冰洁 李根 ZHANG Yuhui;MENG Bin;WANG Limin;TANG Zhengxin;HE Xikou;WU Bingjie;LI Gen(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Research Institute of Special Steel,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China;Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院有限公司特殊钢研究院,北京100081 [3]中国核动力研究设计院,四川成都610213

出　　处：《原子能科学技术》2024年第11期2371-2378,共8页Atomic Energy Science and Technology

基　　金：钢铁研究总院有限公司自主研发专项基金(事23T60180B)。

摘　　要：液态铅铋腐蚀问题是制约铅冷快堆发展的主要问题,商用9%~12%Cr铁素体/马氏体钢被认为是铅冷快堆首选结构材料。本文研究了10Cr9Si1Mo1VNb钢在450℃静态饱和氧铅铋共晶(LBE)中的腐蚀行为。结果表明:10Cr9Si1Mo1VNb钢暴露在LBE后,表面氧化膜主要由外氧化层Fe3O4、次外层(Fe,Cr)3O4和SiO2、内氧化区组成;Si与Cr在氧化过程中表现出协同作用,促进次外层形成,阻碍元素扩散,提高了基体抗氧化性;腐蚀1500 h后基体表面形成连续致密的氧化层,表现出良好的耐铅铋腐蚀性能。本文提出了10Cr9Si1Mo1VNb钢在450℃静态饱和氧LBE环境下的氧化扩散过程模型,为9%Cr耐热钢在铅冷快堆系统的应用提供了一定的理论依据。The corrosion of liquid lead-bismuth is the main problem that restricts the development and practical application of lead-cooled fast reactor(LFR),commercial 9%-12%Cr ferrite/martensite steel(F/M)has excellent high temperature mechanical properties and is considered the preferred structural material in LFR.This paper studied the corrosion behavior of 10Cr9Si1Mo1VNb steel at 450℃static saturated oxygen liquid lead-bismuth eutectic(LBE),for 9%Cr heat-resistant steel in the LFR nuclear system to provide a certain data support and theoretical reference.X-ray diffraction(XRD),scanning electron microscope(SEM),electron probe microanalysis(EPMA)methods were used.The microstructure and composition of 500,1500,3000 and 4500 h samples were analyzed.The oxide film thickness of each layer was measured and the mechanism of oxide film growth was discussed.Based on the experimental results of 10Cr9Si1Mo1VNb steel,the oxidation model of steel in 450℃static saturated oxygen liquid LBE was proposed.The results show that 10Cr9Si1Mo1VNb steel is exposed to LBE,and test steel corrosion forms mainly with oxidation corrosion.The surface of the test steel forms a three-layer oxidation film,consisting of outer oxide layer,sub-outer layer and internal oxidation zone(IOZ).As can be seen from the EDS analysis,the outer oxide layer is mainly Fe3O4.The sub-outer layer consists mainly of Fe-Cr spine and SiO2.The outer oxide layer structure is loose,Pb can penetrate inward through the outer oxide layer.The sub-outer structure is dense and Pb-Bi intrusion is largely non-existent.The IOZ is characterized by the presence of the oxidation reaction at the crystal boundary,where the inward diffusion of oxygen combines with Cr and Si.The priority oxidation occurs at the crystal boundary,and the formation of rich Cr and rich Si oxides occupy the crystal boundary.After statistics and comparison of 500-4500 h test steel oxide film thickness changes,it can be observed that the outer layer of 500-4500 h is in a growth trend.There is a small increase in

关 键 词：10Cr9Si1Mo1VNb钢 铅铋共晶 液态铅铋腐蚀 氧化层 

分 类 号：TL341[核科学技术—核技术及应用]