Cathodic disbonding, blistering, and current demand for cathodic protection were measured for nine commercial coatings for submerged steel structures. The ASTM-G8 standard test and a long-term test (2 years), simulating North Sea conditions, were used. The relevance of the ASTM-G8 test as a prequalification test was evaluated by comparing cathodic disbonding in the two tests. After 800 days in the long-term test, the correlation to ASTM-G8 was good. The correlation coefficient was 0.98. The current demand for cathodic protection increased when the coating blistered. Examination of the blisters showed that they had cracked. After 2 years of testing, the current demand only had increased for the coatings (<150 micrometers). The current demand for the thicker coatings (>450 micrometers) had not increased, in spite of significant cathodic disbonding for some coatings. Coating breakdown factors, defined as the ratio between current demand for cathodic protection for the coated samples and samples of bare steel, were calculated. These factors were compared with the design values for cathodic protection in Det Norske Veritas (DNV) RP B401 and NORSOK M-CR-503. For all coatings, the coating breakdown rate was lower than the design values.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Effects of cathodic disbonding and blistering on current demand for cathodic protection of coated steel


    Additional title:

    Einfluß der kathodischen Enthaftung und der Blasenbildung auf den Strombedarf für den kathodischen Schutz von beschichtetem Stahl


    Contributors:

    Published in:

    Corrosion, Houston ; 56 , 3 ; 256-264


    Publication date :

    2000


    Size :

    9 Seiten, 10 Bilder, 3 Tabellen, 30 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Factors influencing the rate of cathodic disbonding of coatings

    Steinsmo, U. / Skar, J.I. | Tema Archive | 1994


    Effects of hydrotalcite intercalated with corrosion inhibitor on cathodic disbonding of epoxy coatings

    Hang, T. T. / Duong, N. T. / Truc, T. A. et al. | British Library Online Contents | 2015


    System for impressed current cathodic protection

    VAN DELDEN MARC | European Patent Office | 2023

    Free access


    SYSTEM FOR IMPRESSED CURRENT CATHODIC PROTECTION

    VAN DELDEN MARC | European Patent Office | 2021

    Free access