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

Abstract

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
JournalCorrosion
Volume75
Issue number9
Pages (from-to)1026-1033
ISSN0010-9312
DOIs
Publication statusPublished - 2019

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