Fe-Zn化合物粘附的不锈钢高温水腐蚀氧化物显微结构表征  

Microstructure Characterization of Oxides Formed on Stainless Steel with Attachments of Fe-Zn Intermetallics in High Temperature Water

作　　者：赵艳[1] 管建军[1] 刘峰[1] 梁平[1] 程从前[2] 赵杰[2] 

机构地区：[1]辽宁石油化工大学机械工程学院,抚顺113001 [2]大连理工大学材料科学与工程学院,大连116024

出　　处：《腐蚀科学与防护技术》2017年第6期603-608,共6页Corrosion Science and Protection Technology

基　　金：国家自然科学基金(51175240);辽宁省教育厅科学研究项目(L2016008);辽宁省博士科研启动基金(201601336)~~

摘　　要：研究Fe-Zn化合物粘附的304不锈钢在高温高压水中的腐蚀行为,采用扫描电子显微镜(SEM),X射线衍射分析仪(XRD)和同步辐射率入射衍射(SR-GIXRD)评价生长氧化物的显微结构,讨论Fe-Zn化合物粘附对不锈钢基体腐蚀性能的影响。结果表明,不锈钢在300℃水中腐蚀后,表面生长细小Fe_2O_3氧化物和外层块状或片状的Fe_3O_4氧化物。Fe-Zn化合物粘附的不锈钢经过高温高压水腐蚀后,Fe-Zn化合物主要转变成ZnO,随着腐蚀时间的增加,腐蚀产物ZnO逐渐脱落,样品的失重量不断增加;腐蚀时间增加到360和480 h,不锈钢表面较细小的Fe_2O_3氧化物颗粒显露,样品的失重量变化不大。通过SR-GIXRD能够表征较薄的Fe_2O_3氧化膜,而普通XRD不能准确表征。The corrosion behavior of 304 stainless steel with attachments of Fe-Zn intermetallics was investigated in high temperature water. The microstructure of oxide scales was characterized by scanning electron microscope（SEM）, X-ray diffraction（XRD） and synchrotron radiation-grazing incidence X-ray diffraction（SR-GIXRD）. The influence of the attachment of Fe-Zn intermetallics on the corrosion performance of 304 stainless steel was discussed. The results show that tiny Fe2O3 oxides and nubbly or sheet-like Fe3O4 particles grow on the stainless steel surface after corrosion in 300 ℃ water. When the stainless steel with the attachment of Fe-Zn intermetallics is corroded in high temperature water, the Fe-Zn intermetallics could transform into Zn O oxides gradually with time, while the formed oxide scales gradually spalled off resulting in the increment of mass loss. When the corrosion time increases to 360 and 480 h, the tiny Fe2O3 oxides are observed, while the mass loss has little change. The thin Fe2O3 oxide film can be characterized using SR-GIXRD instead of XRD.

关 键 词：不锈钢 低熔点金属Zn 腐蚀 氧化物 SR-GIXRD 

分 类 号：TG174[金属学及工艺—金属表面处理]