Volume 6, Issue 3 (March 2009)

    Electrochemical Impedance Spectroscopy Measurement during Cathodic Disbondment Experiment of Pipeline Coatings

    (Received 19 May 2007; accepted 26 January 2009)

    Published Online: 2009

    CODEN: JAIOAD

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    Abstract

    Modified cathodic disbondment (CD) experiments were carried out over a period of 14 months using 13 coatings used to protect the external surfaces of oil and gas pipelines. During the experiments, electrochemical impedance spectroscopy (EIS) data were recorded, and after the experiments the cathodic disbondment area was measured. From the EIS data, the increase in coating capacitance was determined. Based on the comparison of coating capacitance values obtained from EIS data with the cathodic disbondment data, the coatings were broadly divided into three types: (1) high-performance coatings that did not disbond despite increasing coating capacitance; (2) poor-performance coatings that disbonded more than predicted from the increase in coating capacitance; and (3) average-performance coatings that disbonded at a rate proportional to the increase in coating capacitance.


    Author Information:

    Papavinasam, Sankara
    CANMET Materials Technology Laboratory, Natural Resources Canada, Ottawa, Ontario

    Attard, Michael
    CANMET Materials Technology Laboratory, Natural Resources Canada, Ottawa, Ontario

    Revie, R. Winston
    CANMET Materials Technology Laboratory, Natural Resources Canada, Ottawa, Ontario


    Stock #: JAI101246

    ISSN: 1546-962X

    DOI: 10.1520/JAI101246

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    Author
    Title Electrochemical Impedance Spectroscopy Measurement during Cathodic Disbondment Experiment of Pipeline Coatings
    Symposium Advances in Electrochemical Techniques for Corrosion Monitoring and Measurement, 2007-05-23
    Committee G01