| Abstract Scope |
Buried pipelines are protected from corrosion attack by coating and cathodic protection (CP). As the first line of defense against corrosion, pipeline coating must provide an effective barrier property that separates the pipeline from the environment, remains intact and adhered to the metal, and exhibits corrosion resistance and mechanical strength for long-term protection. However, excessive CP could cause serious damage to pipeline coatings and, consequently, pipeline integrity.
The degradation of pipeline coatings under the influence of excessive CP was investigated. The integrity of the coatings was evaluated using cathodic disbondment tests, electrochemical impedance spectroscopy, and DC current density monitoring. A real buried pipe with vintage coating dug from field was also monitored and investigated under excessive CP.
This research is expected to contribute to the development of effective corrosion mitigation strategies for pipelines subjected to excessive cathodic protection, ensuring the long-term integrity and reliability of buried pipeline infrastructure.
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