新型含铝奥氏体不锈钢在超临界水环境下的腐蚀行为  

Corrosion Behavior of a Novel Alumina-forming-austenitic Stainless Steel Exposed to Supercritical Water

作　　者：孙达云 高阳 张乐福[1] 韩忠立 郭相龙 Sun Dayun;Gao Yang;Zhang Lefu;Han Zhongli;Guo Xianglong(School of Nuclear Science and Engineering,Shanghai Jiao Tong University,Shanghai,200240,China)

机构地区：[1]上海交通大学核科学与工程学院,上海200240

出　　处：《核动力工程》2023年第5期244-250,共7页Nuclear Power Engineering

基　　金：国家重点研发计划(2018YFE0116200)。

摘　　要：为了丰富含铝奥氏体不锈钢(AFAs)在超临界水环境下的腐蚀行为研究数据,支持超临界水冷堆(SCWR)包壳材料评估工作,本研究对自主设计的AFAs进行600℃/25 MPa的超临界水腐蚀实验,结合微观分析表征手段分析其腐蚀行为。结果表明,本研究所用AFAs在腐蚀1000 h后的增重达34 mg/dm^(2),约为相同条件下的310S钢的腐蚀增重的一半。AFAs表面形成了双层氧化物,外层主要为Fe_(2)O_(3)和富Ni尖晶石,内层主要为Cr_(2)O_(3)。氧化铝以离散的颗粒形式存在于内层,阻碍扩散过程的同时可以作为Cr_(2)O_(3)的形核位点,促进Cr_(2)O_(3)的形成。因此,本研究所用AFAs在该实验条件下表现出优异的耐腐蚀性能。In order to enrich the research data on the corrosion behavior of alumina-formingaustenitic stainless steel(AFAs) in the supercritical water environment and provide support for SCWR cladding material evaluation,this study conducted the supercritical water corrosion test at600℃/25 MPa for the independently designed AFAs,and analyzed its corrosion behavior by combining the microscopic analysis and characterization methods.The results show that the corrosion weight gain of AFAs exposed for 1000 h is 34 mg/dm~2,about half of that of 310S steel under the same conditions.There is a double-layer oxide forming on surface of AFAs.The outer layer mainly consists of Fe_2O_(3) and Ni-rich spinel,and the inner layer is mainly composed of Cr_2O_3.Alumina exists in the layer as discrete particles,hindering the diffusion process and promoting the formation of Cr_2O_3.Therefore,AFAs in this study showed excellent corrosion resistance.

关 键 词：含铝奥氏体不锈钢 超临界水 腐蚀 310S钢 

分 类 号：TG174[金属学及工艺—金属表面处理] TL341[金属学及工艺—金属学]