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  • 1
    Electronic Resource
    Electronic Resource
    The Oxidation of Fe-2 and 5 at.% Y Alloys at 600-800°C in Air (1999)
    Springer
    Oxidation of metals 51 (1999), S. 495-506 
    Details
    ISSN: 1573-4889
    Keywords: PURE FE ; Fe-Y ALLOYS ; OXIDATION
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation of Fe-Y alloys containing 2 and 5at.% Y and pure iron has been studied at 600-800°Cin air. The oxidation of pure iron follows the parabolicrate law at all temperatures. The oxidation of Fe-Y alloys at 600°C approximatelyfollows the parabolic rate law, but not at 700 and800°C, where the oxidation goes through severalstages with quite different rates. The oxide scales on Fe-2Y and Fe-5Y at 700 and 800°C arecomposed of external pure Fe oxides containingFe2O3,Fe3O4, and FeO, with FeO being themain oxide and an inner mixture of FeO andYFeO3. The scales on Fe-2Y and Fe-5Y at 600°C consist ofFe2O3,Fe3O4, andY2O3, with a minor amount of FeO.Significant internal oxidation in both Fe-Y alloysoccurred at all temperatures. The Y-containing oxidesfollow the distribution of the original intermetalliccompound phase in the alloys. The effects of Y on theoxidation of pure Fe are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018843327998
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electrochemical-Impedance Study of the Corrosion of Ni and FeAl Intermetallic Alloy in Molten (0.62Li, 0.38K)2CO3 at 650°C (2000)
    Springer
    Oxidation of metals 53 (2000), S. 289-302 
    Details
    ISSN: 1573-4889
    Keywords: Ni ; FeAl ; molten carbonates ; electrochemical impedance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The corrosion of Ni and FeAl in molten (0.62Li, 0.38K)2CO3 mixtures at 650°Cin air has been examined by the electrochemical-impedance spectroscopy (EIS)technique. The impedance spectra for Ni showed the typical characteristics ofa diffusion-controlled reaction, i.e., a semicircle at the high-frequency portand a line at the low-frequency port. The corrosion of FeAl also presentedthe feature of a diffusion-controlled reaction during initial immersion. However,the impedance spectra were composed of two capacitance loops after someimmersion time. The change of the impedance spectra with immersion time maybe ascribed to the formation of continuous external LiFeO2 and an innerAl2O3 layer. Equivalent circuits representing the featuresof the corrosion of Ni and FeAl were proposed to fit the impedance spectra andelectrochemical parameters in the equivalent circuits were also calculated. Basedon the measurement of diffusion impedance, the diffusion ofO− 2 was proposed to be the predominant feature of oxygen reduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004589103992
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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