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51312-01108-A Test to Prescreen Coating Systems Prior To Cathodic Disbondment Testing

Picture for A Test to Prescreen Coating Systems Prior To Cathodic Disbondment Testing
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Product Number: 51312-01108-SG
ISBN: 01108 2012 CP
Author: Laurence W. McKeen
Publication Date: 2012
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$20.00
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Cathodic disbondment testing is used to evaluate the long-term performance of barrier coatings used to protect metal pipe used in underground applications. A multilayered coating system failed this test. Experiments were done to understand the chemistry that led to this failure and that understanding led to potential formulation changes that allowed the coating system to pass the CD test. A simple and relatively inexpensive test based on coating chemistry changes caused by long term exposure to high pH was developed to screen changes to the coatings system. Chemical changes in the adhesive components of coating materials after soaking in solutions of various pH may be monitored by infrared spectroscopy. This paper demonstrates that changing the pH sensitive components of the coating to those shown to be insensitive to pH dramatically improves that likelihood of new coating systems to pass various cathodic disbondment tests.
Cathodic disbondment testing is used to evaluate the long-term performance of barrier coatings used to protect metal pipe used in underground applications. A multilayered coating system failed this test. Experiments were done to understand the chemistry that led to this failure and that understanding led to potential formulation changes that allowed the coating system to pass the CD test. A simple and relatively inexpensive test based on coating chemistry changes caused by long term exposure to high pH was developed to screen changes to the coatings system. Chemical changes in the adhesive components of coating materials after soaking in solutions of various pH may be monitored by infrared spectroscopy. This paper demonstrates that changing the pH sensitive components of the coating to those shown to be insensitive to pH dramatically improves that likelihood of new coating systems to pass various cathodic disbondment tests.
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Picture for Cathodic disbondment test: What are we testing?
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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
$20.00

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 07021 MODIFIED CATHODIC DISBONDMENT TESTING OF EXTERNAL POLYMERIC PIPELINE COATINGS
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07021 MODIFIED CATHODIC DISBONDMENT TESTING OF EXTERNAL POLYMERIC PIPELINE COATINGS

Product Number: 51300-07021-SG
ISBN: 07021 2007 CP
Author: Sankara Papavinasam, Michael Attard, and R.Winston Revie
Publication Date: 2007
$20.00

The research described in this paper was carried out with the objective of establishing any correlation between coating performance and the results of cathodic disbondment testing. Experiments were carried out using 13 coatings. Nine samples of each coating were studied in a total of 117 experiments.
Picture for 05029 Practical Analysis of Cathodic
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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
$20.00

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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