高温液钠与不锈钢界面润湿机制研究  

Study on Interface Wetting Mechanism between High-temperature Liquid Sodium and Stainless Steel

作　　者：田浪浪 马誉高 张卢腾 朱怡儒 唐思邈 马在勇 潘良明[1,2] TIAN Langlang;MA Yugao;ZHANG Luteng;ZHU Yiru;TANG Simiao;MA Zaiyong;PAN Liangming(Key Laboratory of Low-grade Energy Utilization Technologies and Systems,Ministry of Education,Chongqing University,Chongqing 400044,China;Department of Nuclear Engineering and Technology,Chongqing University,Chongqing 400044,China;Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400044 [2]重庆大学核工程与核技术系,重庆400044 [3]中国核动力研究设计院核反应堆系统设计技术重点实验室,四川成都610213

出　　处：《原子能科学技术》2024年第9期1902-1911,共10页Atomic Energy Science and Technology

基　　金：国家自然科学基金(12305174);中国博士后科学基金(2023M730397);重庆市自然科学基金(2023NSCQ-BHX0243)。

摘　　要：钠冷快堆的主要特点是将液态钠作为堆芯冷却剂,因此液态钠与不锈钢固液界面的润湿现象在该堆芯系统中普遍存在。高温液钠在不锈钢界面的润湿性能与结构材料的腐蚀程度、材料自洁以及测量仪器精度等直接相关。本文通过可视化实验和分子动力学数值模拟的方法,针对高温液钠与不锈钢界面的润湿特性开展研究,结果发现:液钠与不锈钢的润湿转捩(接触角90°)温度在320~335℃附近;不锈钢表面的Cr_(2)O_(3)层会抑制液钠前驱膜的形成,使得液钠等效润湿半径减小,导致液钠与不锈钢界面润湿性变差;随着温度逐渐升高,液钠与Cr_(2)O_(3)层逐渐反应生成NaCrO2,使得液钠与不锈钢界面润湿性转好。The main feature of the sodium-cooled fast reactor(SFR)is the application of liquid sodium as the coolant.Hence,the wetting phenomenon at the solid-liquid interface between stainless steel and liquid sodium is significant in this reactor system.Solid-liquid interface wettability is one of the important factors affecting the corrosion of solid materials.The better wettability will make liquid sodium more likely to penetrate the stainless steel substrate and react with internal elements,indicating that the material’s resistance to liquid sodium corrosion performance is worse.For some moving parts,the worse wettability indicates better self-cleaning properties of the material,which can greatly reduce the cost of cleaning and maintenance.In addition,the testing of some physical instruments is also related to the wettability of the liquid sodium,which is not in full contact with the measuring parts until the instrument probe is fully wetted,which can lead to less accurate measurement data.The wettability can be quantitatively characterized by the contact angle.The wetting mechanism of liquid sodium was investigated on the surface of stainless steel flats and Cr_(2)O_(3)-coated stainless steel flats based on experimental measurements and molecular dynamics simulations in this paper.In the experimental part,stepped heating wetting was used to measure the contact angle of liquid sodium at different wetting time and temperatures,and to investigate the effect of chemical reaction between liquid sodium and Cr_(2)O_(3) layer on the surface of stainless steel on the wetting turn and complete wetting temperature at high temperature.In the simulation part,the molecular dynamics method was used to simulate the wetting process of the liquid sodium model on two stainless steel model surfaces with or without the Cr_(2)O_(3) layer under constant wetting conditions,to investigate the effect of the presence of Cr_(2)O_(3) on the surface of stainless steel on the precursor film of liquid sodium as well as the equivalent wetting radiu

关 键 词：钠冷快堆 液钠 不锈钢 润湿性 接触角 

分 类 号：TL34[核科学技术—核技术及应用]