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  • 1970-1974  (3)
  • 1972  (3)
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  • 1970-1974  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 23 (1972), S. 272-278 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Scaling of iron in O2—SO2-inert gas mixtures at 900 °C.Kinetic and metallorgraphic investigations into the oxidation of iron in O2So2-inert gas mixtures show, that SO2 increases the scaling rate of iron when the oxidation in the SO2 free gas follows a linear kinetic law; in these cases the transport of oxygen from the flowing medium to the specimen surface is the rat-controlling step. Such conditions exist at 900 °C and linear flow velocities of 5.8 cm/s at oxygen contents below about 7% At constant oxygen pressure the constant of the linear kinetic law is a linear function of the SO2.
    Notes: Kinetische und metallographische Untersuchungen über Oxydation von Eisen in O2—SO2,-Inertgas-Gemischen zeigen, daß SO2 die Verzunderungsgeschwindigkeit des Eisens erhöht, wenn die Oxydation im SO2-freien Gas nach einem linearen Zeitgesetz erfolgt, weil der Antransport des Sauerstoffs aus dem strömenden Gas an die Oberfläche der Probe geschwindigkeitsbestimmend ist. Bei 900°C und einer linearen Strömungsgeschwindigkeit der Gase von 5,8 cm/sec ist das bei O2-Gehalten Strömungsgeschwindigkeit der Gase von 5,8 cm/sec ist das bei O2-Gehalten kleiner etwa 7% der Fall. Bei konstantem
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 23 (1972), S. 526-526 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 23 (1972), S. 95-98 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Oxidation of iron at high temperatures in inert gases with small oxygen contentsAt temperatures 〉 about 800°C and linear flow velocities of the gas between about 5 and 12 cm/s the oxidation of iron in N2-O2, Ar-O2 and He-O2 mixtures containing 〈 1% oxygen follows a linear kinetic law. Under such conditions the rate controlling step is the transport of oxygen from the gas phase to the surface of the scale layer which consists exclusively of FeO. The constant of the linear kinetic law under laminar flow conditions is proportional to the oxygen content of the gas and to the square root of the gas flow velocity, and inversely proportional to the square root of the gas viscosity, while it is practically independent from temperature. Some conclusions with reference to practical applications are presented.
    Notes: Eisen oxydiert bei Temperaturen 〉 etwa 800°C und bei linearen Strömungsgeschwindigkeiten des Gases zwischen etwa 5 und 12 cm/sec in N2-O2-, Ar-O2- und He-O2-Gemischen mit Sauerstoffgehalten 〈 1% nach einem linearen Zeitgesetz. Geschwindigkeitsbestimmend ist unter diesen Bedingungen der Antransport des Sauerstoffs aus der Gasphase an die Oberfläche der nur aus FeO bestehenden Zunderschicht. Die Konstante des linearen Zeitgesetzes ist bei laminarer Strömung proportional dem Sauerstoffgehalt des Gases, proportional der Quadratwurzel aus der Strömungsgeschwindigkeit des Gaseskehrt, umgekehrt proportional der Quadratwurzel aus der Viskosität des Gases und praktisch unabhängig von der Temperatur. Einige Schlußfolgerungen für die Praxis werden diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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