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

doi:10.5006/3168

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

Department of Geochemistry

Research output: Contribution to journal › Article › Research › peer-review

16 Citations (Scopus)

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 language	English
Pages (from-to)	1026-1033
Number of pages	8
Journal	Corrosion
Volume	75
Issue number	9
DOIs	https://doi.org/10.5006/3168
Publication status	Published - Sept 2019

Keywords

Alternating current (AC)
Cathodic protection
Corrosion rate
Depolarization
Passivity
Potential E-pH diagram
X-ray photoelectron spectroscopy

Programme Area

Programme Area 3: Energy Resources

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10.5006/3168

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title = "Corrosion rate measurement and oxide investigation of AC corrosion at varying AC/DC current densities",

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.",

keywords = "Alternating current (AC), Cathodic protection, Corrosion rate, Depolarization, Passivity, Potential E-pH diagram, X-ray photoelectron spectroscopy",

author = "Olesen, {Andreas Junker} and Knud Dideriksen and Nielsen, {Lars Vendelbo} and Per M{\o}ller",

note = "Publisher Copyright: {\textcopyright} 2019 NACE International.",

year = "2019",

month = sep,

doi = "10.5006/3168",

language = "English",

volume = "75",

pages = "1026--1033",

journal = "Corrosion",

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publisher = "National Association of Corrosion Engineers",

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T1 - Corrosion rate measurement and oxide investigation of AC corrosion at varying AC/DC current densities

AU - Olesen, Andreas Junker

AU - Dideriksen, Knud

AU - Nielsen, Lars Vendelbo

AU - Møller, Per

PY - 2019/9

Y1 - 2019/9

N2 - 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.

AB - 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.

KW - Alternating current (AC)

KW - Cathodic protection

KW - Corrosion rate

KW - Depolarization

KW - Passivity

KW - Potential E-pH diagram

KW - X-ray photoelectron spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=85074952188&partnerID=8YFLogxK

U2 - 10.5006/3168

DO - 10.5006/3168

M3 - Article

AN - SCOPUS:85074952188

SN - 0010-9312

VL - 75

SP - 1026

EP - 1033

JO - Corrosion

JF - Corrosion

IS - 9

ER -

Corrosion rate measurement and oxide investigation of AC corrosion at varying AC/DC current densities

Abstract

Keywords

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