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  • 1975-1979  (2)
  • linear scaling kinetics  (1)
  • oxidation  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Low-temperature oxidation of Fe-24 wt.%Cr (1979)
    Springer
    Oxidation of metals 13 (1979), S. 437-456 
    Details
    ISSN: 1573-4889
    Keywords: Fe-Cr ; oxidation ; kinetics ; oxide morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Ferritic polycrystalline Fe-24 wt.% Cr was oxidized in pure oxygen at 190 ≤ T≤490° C and pressures in the range 5.3×10−2–13.3 Pa for periods of up to 5 hr. The reaction proceeded in three stages. An initial period of accelerating rate was accompanied by oxide island nucleation and growth. Following island coalescence the rate was approximately logarithmic at low temperatures and somewhat slower than parabolic at high temperatures. Rate control during this period was thought to be due to mass transport through the oxide grain boundaries left by the island impingement process. During these first two stages the oxide formed was γ-M2O3 with possibly some spinel. The final stage of reaction involved the appearance of α-M2O3 on the outer oxide surface and a substantial slowing of the oxidation rate due to the low diffusivity in this phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00605109
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The phototarnishing of silver and copper. Part II (1975)
    Springer
    Oxidation of metals 9 (1975), S. 117-126 
    Details
    ISSN: 1573-4889
    Keywords: solid halide spectra ; solid-state photolysis ; linear scaling kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Tarnishing of silver and copper at room temperatures in the presence of CH3I, HI, CH3Br, and HBr is caused by absorption of ultraviolet light of appropriate frequency by the growing metal halide scale. No appreciable thermal tarnishing of silver or copper is observed in the presence of these gases at room temperature. The kinetics of the phototarnishing reactions are linear and the rate depends linearly on the incident light intensity. It is concluded that the primary photochemical process is the production in the metal halides of free electrons which then react with adsorbed gas molecules, thereby propagating the reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00613226
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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