Cathodic protection shielding of coated buried pipeline

During the 2000s, the concept of cathodic protection (CP) shielding was first raised in open literature and remains debated between coatings professionals. The mechanism of CP shielding, and its understanding continue to be studied for different coatings with different approaches and using various techniques. From the CP shielding factors to the assessment methods, the published literature merits a deep analysis to capture the established knowledge and identify the research gaps to further tackle the issue for reliable coated buried structures.

Event Tip: Anticorrosive Coatings

What principles determine the corrosion of metals and how can protective coatings help to prevent corrosion? In this tutorial, the basics of electrochemical processes will be explained, and typical ingredients and formulation features of corrosion protection coatings will be presented and discussed. We will answer these questions online on 05 Sep 2024 in the EC Short Course “Introduction to Anticorrosive Coatings”.

A holistic approach to this topic seems necessary where coatings ageing, cathodic protection, electrochemistry, and transport processes should be considered. In the first part of the review, the recent works related to the understanding of CP shielding, coatings properties were considered before discussing the mechanisms involved underneath coatings. Transport phenomena and their relationship with cathodic protection performance in the presence of chemical and microbiological processes are discussed in the second part. Finally, CP shielding assessment methods and modeling works are presented and discussed from different perspectives.

Journal of Coatings Technology and Research, Volume 21, pages 445–459, December 2024