The historical development of marine cathodic protection design, along with the recently developed, first-principles-based slope parameter method, is reviewed briefly. It was projected that the remaining issues that require resolution before cathodic protection design can be optimized are improved methods for representing the slope parameter, anode current capacity, and mean current density. The present paper focuses on the last of these, and, in so doing, evaluates data from a variety of field structures for which such information exists and from laboratory and field test programs. An analytical model for current density decay with time, as a consequence of calcareous deposit formation, is presented; and a new method is proposed for specifying mean current density in cathodic protection design of offshore structures. It is shown, that current density decay with time exhibits an initial period during which current density was approximately constant or decreased at a relatively constant rate followed by a more pronounced decay, which conformed to a power law relationship. In most instances, this decay was continuous such that a steady state was never achieved.


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    Title :

    A principal determinant in cathodic protection design of offshore structures - The mean current density


    Additional title:

    Eine prinzipielle Determinante bei der Gestaltung des kathodischen Schutzes von Meereskonstruktionen - die mittlere Stromdichte


    Contributors:
    Hartt, W.H. (author) / Lemieux, E. (author)

    Published in:

    Corrosion, Houston ; 56 , 10 ; 988-997


    Publication date :

    2000


    Size :

    10 Seiten, 16 Bilder, 4 Tabellen, 33 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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