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    Design Considerations for Occluded Cell Corrosion Monitoring

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    Occluded cell corrosion is a major contributor to unexpected and premature failures. A reliable, on-line instrument to monitor for occluded cell corrosion would generate benefits of a decreased frequency of failures and a more reliable estimation of service life. This paper reviews the thermodynamic and kinetic bases for such a practical monitor to show that the concept is sound. Crevice dimensions, cathode-to-anode area ratio, and defined hydrodynamics—parameters important in the in-plant monitor—are defined in this discussion. Finally, a conceptual model of a proposed in-plant monitor is presented. The dimensions and geometry are derived from the discussion of the theory.


    crevice corrosion, thermodynamics, electrochemistry, occluded cell corrosion, metals, cathode, anode

    Author Information:

    Silverman, DC
    Associate fellow, Monsanto Chemical Co., St. Louis, MO

    Krisher, AS
    Technical director, Materials Technology Institute of the Chemical Process Industries, St. Louis, MO

    Committee/Subcommittee: G01.11

    DOI: 10.1520/STP17463S