预氧化GH4169合金在中温固态NaCl和O_(2)+H_(2)O气氛中的腐蚀行为研究  

Corrosion Behavior of Pre-oxidized GH4169 Alloy Beneath Solid NaCl Deposit Film in Wet Oxygen Flow at 600℃

作　　者：张伟东 崔宇 刘莉[1] 王福会[1] ZHANG Weidong;CUI Yu;LIU Li;WANG Fuhui(Corrosion and Protection Center,Northeastern University,Shenyang 110819,China;Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]东北大学腐蚀与防护中心,沈阳110819 [2]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016

出　　处：《中国腐蚀与防护学报》2025年第1期182-190,共9页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(U22A20111)。

摘　　要：利用氧化动力学测试,扫描电子显微镜(SEM),X射线衍射仪(XRD)和透射电子显微镜(TEM)等分析技术,系统研究了预氧化后的GH4169合金在中温NaCl和O_(2)+H_(2)O气氛中的腐蚀行为。结果表明,GH4169合金预氧化形成了Cr_(2)O_(3)/Nb_(2)O_(5)为主的连续氧化膜,在中温盐水环境下腐蚀5 h后氧化膜被严重破坏,形成了主要由NiFe_(2)O_(4)、NaNbO_(3)、Na_(2)CrO_(4)及残留Cr_(2)O_(3)构成的腐蚀产物膜。详细讨论了预氧化GH4169合金在中温固态NaCl和O_(2)+H_(2)O气氛下的腐蚀机制以及预氧化膜破坏的过程。The corrosion behavior of pre-oxidized GH4169 alloy beneath a solid NaCl deposit film in flowing water vapor containing O_(2)at 600℃was investigated by means of oxidation kinetics measurement,scanning electron microscopy(SEM),X-ray diffraction(XRD)and transmission electron microscope(TEM)in the aspects of corrosion kinetics,morphology and phase composition of corrosion products.The results indicate that a continuous oxide scale composed mainly of Cr_(2)O_(3)/Nb_(2)O_(5)was formed by pre-oxidation of GH4169 alloy in air at 1000℃for 2 h.However,after 5 h corrosion in the above designed conditions,the pre-oxidized GH4169 alloy underwent serious corrosion,while the pre-formed oxide scale was seriously damaged,and the corrosion product scale mainly composed of NiFe_(2)O_(4),NaNbO_(3),Na_(2)CrO_(4)and residual Cr_(2)O_(3)was formed.Finally,the corrosion mechanism of the pre-oxidized GH4169 alloy beneath a solid NaCl deposit film in flowing water vapor containing O_(2)at 600℃was discussed in detail,in terms of the deterioration prcoess of the pre-oxidation scale.

关 键 词：预氧化 固态NaCl和水蒸汽 中温 

分 类 号：TG174[金属学及工艺—金属表面处理]