Corrosion Rate Measurement and Oxide Investigation of AC Corrosion at Varying AC/DC Current Densities

Andreas Junker Olesen, Knud Dideriksen, Lars Vendelbo Nielsen*, Per Møller

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


Corrosion of pipelines under cathodic protection (CP) caused by induced alternating current (AC) is highly dependent on the cathodic current density. This study uses electrical resistance probes to produce a corrosion rate map of the AC/DC current density domain, using a galvanostatic CP system subject to varying AC voltage interference levels. Two corrosion domains are recognized at high or low CP, respectively. X-ray photoelectron spectroscopy is utilized for analysis of surface oxides, being primarily magnetite and ferrous hydroxide. The results are discussed in a Pourbaix diagram context.
Original languageEnglish
Issue number9
Pages (from-to)1026-1033
Publication statusPublished - 2019

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