X射线光电子能谱
材料科学
微晶
腐蚀
硅
冶金
晶界
氧化物
转换电子穆斯堡尔谱
分析化学(期刊)
合金
穆斯堡尔谱学
化学工程
微观结构
化学
结晶学
穆斯堡尔效应
工程类
色谱法
作者
R. Idczak,K. Idczak,Robert Konieczny
出处
期刊:Corrosion
[NACE International]
日期:2018-01-07
卷期号:74 (6): 623-634
被引量:5
摘要
The high-temperature corrosion behavior of three polycrystalline Fe-Si alloys containing approximately 4, 5, and 10 at% Si was studied using transmission Mössbauer spectroscopy (TMS), conversion electron Mössbauer spectroscopy (CEMS), and x-ray photoelectron spectroscopy (XPS). The XPS measurements reveal the strong segregation process of silicon atoms to the surface. Moreover, the obtained XPS results suggest that the presence of adsorbed oxygen on the Fe-Si surface effectively enhances the silicon segregation process. On the other hand, the obtained TMS and CEMS spectra show that even 10% of silicon atoms dissolved in the iron matrix do not prevent high-temperature corrosion of the studied Fe-Si alloys. During exposure to air at 870 K, a systematic growth of an α-Fe2O3 compound was observed. Finally, the Mössbauer results show that, during exposure to air, oxygen atoms diffuse to the studied polycrystalline materials not only through the oxide/metal interface on the surface but also along the grain boundaries. Such effects result in the formation of iron oxides in deeper parts of the alloy.
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