Comparison of the Oxidation Process in Pure Iron and Diluted Fe–Si Alloys: A Transmission Mössbauer Spectroscopy Study

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• 作者：R. Idczak
• 关键词：Mössbauer spectroscopy ; Polycrystalline iron ; Iron alloys ; High ; temperature corrosion ; Internal oxidation
• 刊名：Oxidation of Metals
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：87
• 期：1-2
• 页码：75-88
• 全文大小：947KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Metallic Materials; Inorganic Chemistry; Tribology, Corrosion and Coatings;
• 出版者：Springer US
• ISSN：1573-4889
• 卷排序：87

文摘

The room temperature study of polycrystalline iron, Fe_0.99Si_0.01 and Fe_0.97Si_0.03 alloys, was performed using the 57Fe transmission Mössbauer spectroscopy (TMS). The TMS measurements allow us to determine changes of chemical composition and content of iron oxides in the studied samples during exposure to air at 570, 870 and 1070 K. The results indicate that the chemical composition of samples changes significantly and it is strongly dependent on the temperature at which the studied samples are exposed to air. Moreover, it was shown that the addition of few atomic percent of Si impurities to iron leads to a significant slowdown of the internal oxidation process. The iron and silicon internal oxidation kinetics for Fe_0.99Si_0.01 and Fe_0.97Si_0.03 alloys were calculated using the Deal-Grove model. The activation energies E_A for the internal oxidation of iron atoms in studied Fe–Si alloys were estimated: E_A = 1.46 (3) eV for Fe_0.99Si_0.01 and E_A = 1.62 (6) eV for Fe_0.97Si_0.03.