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  • 1
    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: Investigations on the Inclination of passivated Chrome-Nickel-Steels to Intercrystalline Corrosion by means of a PotentiostateBy comparing current density  -  voltage curves of steels containing 5-8 pct. of chrome and of the alloy FeNi 36 in 1 n-sulfuric acid (fig. 1,2) we found that according to the degree of the decrease of chrome the passivation potential of grain boundaries is higher than that of its own, austenitic grains. Because of this, etching steel specimens at a voltage of -0,1 V against the saturated kalomel electrode, is a sensitive test to determine the inclination of steel to intercrystalline corrosion.Applying a potentiostate, it is possible to identify the presence of the α-Phase and δ-ferrit at suitable voltages as taken from table 1.
    Notes: Auf Grund des Vergleichs der Potential-Polarisationskurven von Stählen mit 5 bis18% Cr und von der Legierung Fe-Ni 36% in 1 n-H2SO4 wurde gefunden, daß das Passivierungs potential der Korngrenzen je nach dem Grad der Chromverarmung höher ist als das Passivierungspotential des eigenen austenitischen Kornes. Dank dieses Umstandes kann man die Neigung des Stahls zur interkristallinen Korrosion durch ätzung beim Potential -0,10 V gegen SKE (SCE) empfindlich feststellen.Durch Ätzen mit Hilfe des Potentiostats kann man zugleich die Anwesenheit von δ-Ferrit und α-Phase bei geeigneten Potentialen mit Vorzug identifizieren.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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