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08007 Effect of Anode Isolation Methods on Coating Cathodic Disbondment

Picture for 08007 Effect of Anode Isolation Methods on Coating Cathodic Disbondment
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Product Number: 51300-08007-SG
ISBN: 08007 2008 CP
Author: Amal Al-Borno, Sherry Rao, and Mick Brown
Publication Date: 2008
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$20.00
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Techniques in anode isolation in laboratory Cathodic Disbondment (CD) testing have been developed to more closely simulate conditions of buried pipelines where there is generally large separation of anode from any holidays in the pipe coating. Various methods of anode isolation have been used but little work has been done directly comparing the effects of different isolation methods. One of the effects of anode isolation in the CD test is that it affects the chemistry of the electrolyte in contact with the holiday in the coating; this is important, especially in long-term tests, as chemical attack can influence disbondment and reduce coating thickness. This study examines different anode isolation techniques and their effects on the pH of the solution and on the coating disbondment results observed in Cathodic Disbondment (CD) tests of two coatings. One was a two-component 100% solids epoxy/urethane coating system and the other coating was a two-component 100% solids epoxy coating system. Both coatings are used for coating of girth welds, as well as many pipeline, marine and industrial applications. Results obtained from this study indicate that there was relatively little difference in disbondment versus the five anode isolation techniques used. However testing with “no anode isolation” resulted in slightly higher disbondment of the coating but significantly lower pH of the test solution.
Techniques in anode isolation in laboratory Cathodic Disbondment (CD) testing have been developed to more closely simulate conditions of buried pipelines where there is generally large separation of anode from any holidays in the pipe coating. Various methods of anode isolation have been used but little work has been done directly comparing the effects of different isolation methods. One of the effects of anode isolation in the CD test is that it affects the chemistry of the electrolyte in contact with the holiday in the coating; this is important, especially in long-term tests, as chemical attack can influence disbondment and reduce coating thickness. This study examines different anode isolation techniques and their effects on the pH of the solution and on the coating disbondment results observed in Cathodic Disbondment (CD) tests of two coatings. One was a two-component 100% solids epoxy/urethane coating system and the other coating was a two-component 100% solids epoxy coating system. Both coatings are used for coating of girth welds, as well as many pipeline, marine and industrial applications. Results obtained from this study indicate that there was relatively little difference in disbondment versus the five anode isolation techniques used. However testing with “no anode isolation” resulted in slightly higher disbondment of the coating but significantly lower pH of the test solution.
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05029 Practical Analysis of Cathodic Disbondment Test Methods

Product Number: 51300-05029-SG
ISBN: 05029 2005 CP
Author: Katherine Cameron, Jiri Holub, and Dennis T. Wong, ShawCor Ltd.
Publication Date: 2005
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A review of cathodic disbondment test (CDT) methods from standard organizations such as ASTM, ISO, CSA, NF and AS is presented in this paper.
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51312-01285-Cathodic disbondment test: What are we testing?

Product Number: 51312-01285-SG
ISBN: 01285 2012 CP
Author: Markus Betz
Publication Date: 2012
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The cathodic disbondment (CD) test is a well known and generally accepted laboratory test for pipeline coatings for a long time. What are we testing and what is the significance of the test? By means of basic investigations factors influencing cathodic delamination have been identified and their extent on the delamination radius has been assessed.
Picture for Penetration of Cathodic Protection into Pipeline Coating Disbondment
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Penetration of Cathodic Protection into Pipeline Coating Disbondment

Product Number: 51317--9146-SG
ISBN: 9146 2017 CP
Author: Li Yan
Publication Date: 2017
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An experimental setup was designed to investigate the cathodic protection (CP) penetration into coating disbondment. Embedded detection probes underneath the disbondment enabled pH and steel potential measurements without disturbing the environment inside the disbondment.
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