含铝强化奥氏体钢在550℃液态铅铋中的腐蚀行为  

Corrosion behavior of aluminum reinforced austenitic steel in liquid lead bismuth at 550℃

作　　者：甘舒匀 徐帅 李炳生 柴林江[3] 陈黎明[2] 何晓珣 汪利 刘思捷 文春梅 李佳奇 伍忠政 Gan Shu-Yun;Xu Shuai;Li Bing-Sheng;Chai Lin-Jiang;Chen Li-Ming;He Xiao-Xun;Wang Li;Liu Si-Jie;Wen Chun-Mei;Li Jia-Qi;Wu Zhong-Zheng(School of Materials and Chemistry,Southwest University of Science and Technology,Mianyang 621010,China;State Key Laboratory for Environment-Friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,China;Department of Material Forming and Control,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]西南科技大学材料与化学学院,绵阳621010 [2]西南科技大学,环境友好能源国家重点实验室,绵阳621010 [3]重庆理工大学材料成型及控制工程系,重庆400054

出　　处：《物理学报》2024年第2期242-255,共14页Acta Physica Sinica

基　　金：高等学校博士学科点专项科研基金(批准号:20zx7104)资助的课题。

摘　　要：先进铅冷快堆和加速器驱动次临界系统商业化的关键材料问题是结构材料与铅基冷却剂之间的相容性问题,结构钢材料需要在高温液态铅铋共晶中具有优异的抗腐蚀能力.含铝强化奥氏体钢(alumina-forming austenite steel,AFA钢)因其表面可以形成Al_(2)O_(3)膜而在极端环境中具有良好的耐蚀性能.本文研究了降低Ni元素成分和高温预氧化对AFA钢耐铅铋腐蚀性能的影响,利用扫描电子显微镜、能量色散X射线光谱仪、X射线衍射技术,对AFA钢在550℃液态铅铋饱和溶氧条件下腐蚀600 h的氧化层形貌及结构进行表征.结果表明:降低合金中Ni含量和高温预氧化处理都会促进样品表面形成保护性Al_(2)O_(3)氧化膜,进而降低腐蚀层厚度,提升材料耐铅铋腐蚀性能.The key material issue for the commercialization of advanced lead cooled fast reactors and accelerator driven subcritical systems is the compatibility between structural materials and lead based coolants.Structural steel materials require excellent corrosion resistance in high-temperature liquid lead bismuth eutectic(LBE)alloy.Aluminum forming austenitic steel(AFA steel)has excellent corrosion resistance in extreme environments due to its ability to form an Al_(2)O_(3) film on its surface.However,excessively high Ni elements are more easily dissolved or oxidized in LBE than Fe and Cr elements.Therefore,this work investigates the effect of reducing Ni element composition(25-Ni steel and 18-Ni steel)on the corrosion resistance of steel in LBE.Surface treatment can protect the substrate from corrosion to some extent,so herein we explore whether it has a protective effect on AFA steel in LBE by generating Al_(2)O_(3) through high-temperature pre oxidation.The morphology and structure of the oxide layer of AFA steel corroded for 600 h in LBE with saturated dissolved oxygen at 550℃are characterized by scanning electron microscope(SEM),energy dispersive spectrometer(EDS),X-ray diffraction(XRD),and other technologies.The results indicate that the oxide film formed after corrosion of 18-Ni steel is thinner than that after corrosion of 25-Ni steel.Performing high-temperature pre oxidation is beneficial to forming a protective Al_(2)O_(3) oxide film on the surface of the sample,thereby reducing the thickness of the oxide layer and improving the material’s LBE corrosion resistance.The reduction in thickness of the oxide layer generated after pre oxidation of 18-Ni steel is greater than that of 25-Ni steel,so the anti-corrosion effect of 18-Ni steel after pre oxidation is better than that of 25-Ni steel.

关 键 词：铝强化奥氏体钢 氧化层 铅铋共晶 高温预氧化 

分 类 号：TG172[金属学及工艺—金属表面处理] TL341[金属学及工艺—金属学]