Mechanical Properties and Corrosion Mechanism of the FN04Mo on 7 Kinds of Typical Atmospheric Environment
SUN Youmei1,2,3, ZHAO Quancheng1,4, LI Qian1,2, WANG Ling1,3, SHE Zuxin1,3, WANG Changpeng1,4
1 Southwest Institute of Technology and Engineering, Chongqing 400039, China 2 Hainan Wanning Atmospheric Material Corrision Field National Observation and Research Station, Wanning 571522, China 3 Chongqing Key Laboratory of Environmental Effect and Protection, Chongqing 400039, China 4 CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing 400039, China
Abstract: 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 SO2-rich industrial atmosphere (Jiangjin) is the most corrosive. The corrosion products of the samples exposed for 1 year in Jiangjin are α-FeOOH、γ-FeOOH and Fe3O4, while the corrosion products of the samples exposed for 9 months in Yongxing are β-FeOOH、γ-FeOOH、Fe3O4 and FeOCl. The two atmospheric pollutants, the aggressive Cl- and polar SO2, 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.
孙有美, 赵全成, 李茜, 王玲, 佘祖新, 王长朋. FN04Mo在七种典型大气环境下的力学性能变化规律及腐蚀机理[J]. 材料导报, 2021, 35(18): 18182-18189.
SUN Youmei, ZHAO Quancheng, LI Qian, WANG Ling, SHE Zuxin, WANG Changpeng. Mechanical Properties and Corrosion Mechanism of the FN04Mo on 7 Kinds of Typical Atmospheric Environment. Materials Reports, 2021, 35(18): 18182-18189.
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2021, Vol. 35 
