Understanding of tribocorrosion and corrosion characteristics of 304L stainless steel in hot concentrated nitric acid solution  

304L不锈钢在热浓硝酸溶液中的腐蚀磨损行为和腐蚀行为研究

作　　者：LIU Zheng ZHANG Lian-min LIU Chen-chen TAN Ke-di MA Ai-li ZHENG Yu-gui 刘政;张连民;刘晨晨;谭珂迪;马爱利;郑玉贵(CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China)

机构地区：[1]CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China

出　　处：《Journal of Central South University》2024年第10期3657-3673,共17页中南大学学报（英文版）

基　　金：Projects(52101105,52373321)supported by the National Natural Science Foundation of China;Project(2023-PY03)supported by the IMR Innovation Fund,China;Project(CNNC-LCKY-202274)supported by the LingChuang Research Project of China National Nuclear Corporation。

摘　　要：Spent fuel reprocessing plays a pivotal role in achieving efficient recycling of nuclear fuel.Among thedifferent forms of failure encountered in spent fuel reprocessing,tribocorrosion stands out as a critical concern.Herein,the tribocorrosion behavior,as well as the corrosion behavior,of 304L stainless steel(SS)in high-temperatureconcentrated nitric acid was investigated.The results indicated that 304L SS formed a thin(1.54 nm)and stable passivefilm on the surface,imparting high resistance to nitric acid corrosion.Meanwhile,it was found that the synergistic effectbetween corrosion and wear accounted for a high total tribocorrosion weight loss of over 85%,implying the dominantrole of the synergistic effect in the tribocorrosion process.Furthermore,the wear of 304L SS in deionized water revealedboth abrasive and adhesive wear characterizations,whereas the tribocorrosion in nitric acid only exhibited abrasive wearfeature.Eventually,the tribocorrosion and corrosion models of 304L SS in hot concentrated nitric acid were proposedbased on the comprehensive experimental findings.乏燃料后处理技术在实现核燃料的高效再循环方面发挥着关键作用。乏燃料后处理过程中存在各种形式的设备失效问题,其中腐蚀磨损问题引人关注。本文研究了304L不锈钢在高温浓硝酸中的腐蚀磨损行为以及腐蚀行为。结果表明,在热浓硝酸中,304L不锈钢表面形成了一层致密稳定的钝化膜,具有很高的耐硝酸腐蚀性。研究发现,腐蚀和磨损间的协同效应导致的失重在整个腐蚀磨损失重中所占比例很大(超过85%),这意味着协同效应在腐蚀磨损过程中起主导作用。此外,304L不锈钢在去离子水中的磨损表现出磨粒磨损和粘着磨损的特征,而在硝酸中的腐蚀磨损只表现出磨粒磨损的特征。结合相关实验结果,提出了304L不锈钢在热浓硝酸中的腐蚀磨损和腐蚀模型。

关 键 词：304L stainless steel TRIBOCORROSION CORROSION hot nitric acid mechanism model 

分 类 号：TG172[金属学及工艺—金属表面处理]