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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 27 (1976), S. 497-504 
    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: Die Kinetik der Lochkorrosion eines 13% Cr-Stahl in neutralen ChloridlösungenDie Kinetik der Lochkorrosion ist vor allem eine Funktion der Induktionszeit und des Lochfraßpotentials, so daß diejenigen Faktoren ermittelt werden müssen, welche diese beiden Parameter beeinflussen. Zur Bestimmung des Potentials eignen sich potentiostatische Methoden, wobei als Kriterium der Lochkorrosion der Stromanstieg und die im Stereomikroskop sichtbare Loch-bildung dienen. Die unterschiedliche Lochform (kugel-und halbkugeligen Querschnitt), wobei der Radius bis zum doppelten des Radius der Lochöffnung wächst. Von diesem Augenblick an kommt es nur noch zur Lochvertiefung, wobei das Loch konische Gestalt annimmt. Insgesamt ergibt sich ein diffusions- kontrollierter Mechanismus, bei dem auch die Reduktion von Sauerstoff eine Rolle spielen kann.
    Notes: The kinetics of pitting corrosion is pre-dominantly a function of the induction time and of the pitting potentials, so that it is indispensable to find all those two parameters. In order to find the potential one may use potentiostatic methods, the criterion of pitting corrosion being the current increase and the pit formation made visible in the stereomicroscope. The induction time increase as the applied potential decreases. The differences in the shape of the pits(spherical, semispherical, conical) have not been clearly interpreted so far; basically, in most cases, the cross section of the pits is semispherical at first, the radius increasing double the radius of the opening of the pit. From this moment on there is only pit growth to the depth, the pit becoming of conical shape. The overall mechanism is diffusion controlled, and the reduction of oxygen may play a certain role, too.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
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