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  • 1
    Electronic Resource
    Electronic Resource
    NaCl-induced accelerated oxidation of chromium (1986)
    Springer
    Oxidation of metals 26 (1986), S. 201-212 
    Details
    ISSN: 1573-4889
    Keywords: chromium ; NaCl ; chloride ; oxidation ; hot corrosion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper describes new phenomena about chloride-induced accelerated oxidation of chromium. Thermal analysis was adopted to examine the oxidation, which was studied particularly in the case of NaCl. The presence of NaCl remarkably accelerates the oxidation of chromium. The process occurs below the melting point of NaCl, and the main reaction product is Cr2O3. In the accelerated oxidation NaCl plays a catalytic role because it is not consumed significantly in the process. DTA analysis reveals that the heat of reaction also accelerates the rate of oxidation, especially at an early stage of the reaction. The accelerated oxidation takes place similarly under the presence of chlorides other than NaCl, but the oxidation rate depends on the kind of salt. Therefore the Cl− anion plays an important role in the process, while the nature of the cation affects the rate of acceleration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00659184
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  • 2
    Electronic Resource
    Electronic Resource
    Accelerated oxidation rate of chromium induced by sodium chloride (1987)
    Springer
    Oxidation of metals 27 (1987), S. 315-332 
    Details
    ISSN: 1573-4889
    Keywords: chromium ; NaCl ; oxidation ; hot corrosion ; mechanism
    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 rate of NaCl-coated chromium was measured over the temperature range of 823–1043 K. Although the melting point of NaCl is 1074 K, accelerated oxidation was observed at every temperature. Oxidation mass-gain curves were divided into two types. Type I involved only accelerated oxidation during the initial stage followed by the formation of a thin protective Cr2O3 film. Type II pertained to an acceleration over a long time, forming a thick and nonprotective Cr2O3film containing Na2CrO4. The former type of oxidation occurred at lower temperatures or with a small amount of NaCl, whereas the latter occurred at higher temperatures and with large amounts of NaCl. A comparison of these oxidation processes with those by CaCl2 or BaCl2, revealed two problems: (1) Why was the oxidation rate of chromium so high in the presence of NaCl?, and (2) Why did the high oxidation rate continue for such a long time?
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00659274
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