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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 10 (1960), S. 163-165 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 206-210 
    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: Korrosion von Kupfer in Schwefelsaure bei WärmeübergangsbedingungenBei spontaner Konvektion von der oberen horizontalen Fläche von scheibenförmigen Kupferelektroden wurde die Korrosionsgeschwindigkeit von Kupfer in einer Lösung von 1 N Schwefelsäure + 0,001 M Kaliumdichromat gemessen. Dabei wurden die Einflüsse der Oberflächentemperatur des korrodierenden Metalls und der Einfluß der Temperaturdifferenz zwischen der Metalloberfläche und der Lösung ermittelt. Der beschleunigende Einfluß des Wärmeübergangs wird der zusätzlichen Strömung zugeschrieben, die durch den Temperaturgradienten erzeugt wird. Die Ergebnisse können durch die Gleichung Sh = 0.163 (Sc - GRh)0.33 wiedergegeben werden, worin Sh = Sherwood-Zahl, welche die Korrosionsgeschwindigkeit unter Wärmeübergang ausdrückt, GRh = kombinierte Grasshof-Zahl für den Einfluß von Konzentration und Temperatur, und Sc = Schmidt-Zahl.
    Notes: Under the conditions of the spontaneous convection from the upper horizontal surface of disk-type copper electrodes the copper corrosion rate in a solution of 1 N H2SO4 +0.001 M K2Cr2O7 was measured. The effects of the surface temperature of the corroding metal and the effect of the temperature difference between the surface and the solution were determined. The accelerating effect of the heat transfer is attributed to the additional free flow induced by the temperature gradient. Results can be correlated by the equation Sh = 0.163 (Sc · GRh)0.33, where Sh is the Sherwood number expressing the corrosion rate at the heat transfer, GRh is the combined Grashof number for the pressure effect of concentration and temperature, and Sc is the Schmidt number.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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