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Wednesday, 30 September 2020
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Raw materials & technologies, Technologies

Evaluation of the cathodic disbondment resistance of pipeline coatings

Wednesday, 9 September 2020

A new paper reviews the various mechanisms proposed in the literature for cathodic disbondment.

The aim of the article is to provide useful guidance for selecting pipeline coating systems. Image source: LoggaWiggler - Pixabay (symbol image).

The aim of the article is to provide useful guidance for selecting pipeline coating systems. Image source: LoggaWiggler - Pixabay (symbol image).

For coated pipelines with cathodic protection, cathodic disbondment has been recognised as the main cause of coating degradation. A thorough understanding of the cathodic disbondment mechanism, a proper evaluation of the coating resistance to disbondment as well as a precise monitoring of the cathodic protection level would minimise the occurrence of cathodic disbondment and help to maintain a pipeline’s long-term integrity.

Critical review

To provide useful guidance for selecting pipeline coating systems, cathodic disbondment test methods (categorised as standard test methods or modified test methods) that have been developed over the past two decades are then critically reviewed.

In-situ techniques for assessing cathodic disbondment of coatings, especially those having promise for field applications, are also discussed. Finally, a brief discussion on the mitigation of cathodic disbondment and the associated corrosion is presented.

The review has been published in Progress in Organic Coatings, Volume 146, September 2020.

Image source: Pixabay.

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