摘要
本工作通过金属注塑成型方法制备了FN04Mo样品,并采用电液伺服试验机、X射线衍射分析、扫描电子显微镜、能谱分析仪等对FN04Mo在万宁站、漠河站、敦煌站、拉萨站、江津站、西双版纳站、永兴站七种典型大气环境下的力学性能规律和腐蚀机理进行了研究。研究结果表明,FN04Mo腐蚀初期(1~3个月)力学性能变化呈现明显的下降趋势,试验至3~18个月后其力学性能基本保持稳定。FN04Mo在七种典型大气暴露试验1年后,样品表面均布满腐蚀产物,表面腐蚀形态为点蚀。FN04Mo在富含Cl~-海洋大气环境(万宁和永兴)和富含SO_(2)工业大气环境(江津)下腐蚀最严重。样品在江津暴露1年的腐蚀产物为α-FeOOH、γ-FeOOH以及Fe_(3)O_(4),在永兴暴露9个月的腐蚀产物为β-FeOOH、γ-FeOOH、Fe_(3)O_(4)和FeOCl。侵蚀性强Cl~-和极性强SO_(2)两种大气污染物在大气环境下加剧了FN04Mo基体腐蚀,大气暴露后的FN04Mo样品因腐蚀产物的形成、分层脱落等现象,造成其有效承载面积减小,使其力学性能发生了显著变化。
In this paper,FN04Mo was prepared by metal injection molding.The mechanical properties and corrosion mechanisms of FN04Mo under se-ven typical atmospheric conditions at Wanning Station,Mohe Station,Dunhuang Station,Lasa Station,Jiangjin Station,Xishuangbanna Station,and Yongxing Station were investigated using electro-hydraulic servo tester,X-ray diffraction analysis,scanning electron microscopy,and energy spectrum analyzer.The results showed that mechanical properties of FN04Mo at the initial stage of corrosion(1—3 months)appeared a significant decreasing trend and remained stable after 3—18 months.After 1 year exposure test in the seven typical atmospheres,the surface of FN04Mo was covered with corrosion products and the surface corrosion pattern is pitting.The SO_(2)-rich industrial atmosphere(Jiangjin)is the most corrosive.The corrosion products of the samples exposed for 1 year in Jiangjin areα-FeOOH、γ-FeOOH and Fe_(3)O_(4),while the corrosion products of the samples exposed for 9 months in Yongxing areβ-FeOOH、γ-FeOOH、Fe_(3)O_(4)and FeOCl.The two atmospheric pollutants,the aggressive Cl-and polar SO_(2),aggravated the corrosion of the FN04Mo matrix in the atmospheric environment.The formation of corrosion pro-ducts and delamination of the FN04Mo sample after atmospheric exposure reduced its effective bearing area and led to significant changes in its mechanical properties.
作者
孙有美
赵全成
李茜
王玲
佘祖新
王长朋
SUN Youmei;ZHAO Quancheng;LI Qian;WANG Ling;SHE Zuxin;WANG Changpeng(Southwest Institute of Technology and Engineering,Chongqing 400039,China;Hainan Wanning Atmospheric Material Corrision Field National Observation and Research Station,Wanning 571522,China;Chongqing Key Laboratory of Environmental Effect and Protection,Chongqing 400039,China;CSGC Key Laboratory of Ammunition Storage Environmental Effects,Chongqing 400039,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第18期18182-18189,共8页
Materials Reports
基金
技术基础科研项目(JSHS2017209B001)。
关键词
FN04Mo
大气环境试验
大气腐蚀
力学性能
腐蚀机理
FN04Mo
atmospheric environment test
atmospheric corrosion
mechanical property
corrosion mechanism
