NDLI: Influence of Remanent Magnetization on Pitting Corrosion in Pipeline Steel

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Espina-Herna´ndez, J. H. Caleyo, F. Hallen, J. M. Lo´pez-Montenegro, A. Pe´rez-Baruch, E.
Copyright Year	2010
Abstract	These days, in-line inspections based on the magnetic flux leakage (MFL) principle are routinely used to detect and size metal loss and mechanical anomalies in operating oil and gas pipelines. One of the characteristics of the MFL technology is that after the inspection, the pipeline wall shows a remanent magnetization. In this work, the influence of the magnetic field on pitting corrosion in pipeline steel is studied. Pitting corrosion experiments have been carried out on samples of an API 5L grade 52 steel under a magnetization level of the same order of magnitude of the remanent magnetization in the pipeline wall after the MFL inspection. The samples were magnetized using rings of the investigated steel. The closed magnetic circuit configuration used in this study survey guaranteed that the samples kept the same magnetization level during the complete duration of the conducted experiments. This experimental setup was used in order to reproduce the conditions observed in MFL-inspected pipelines in which the magnetic field was confined to the pipe wall thickness. Immediately after magnetization, the investigated samples were subjected to pitting by immersing them in a solution with dissolved Cl− and SO42− ions. The pitting experiments were conducted for exposure times of 7 days. Non-magnetized specimens were used as control samples. The depths of the pits induced in the investigated samples were measured using optical microscopy. The maximum pit depth of each sample was recorded and used to conduct extreme value analysis of the pitting process in the magnetized and non-magnetized specimens. The results of this investigation indicate that the magnetic field confined within the pipeline wall has a significant influence on the pitting corrosion process. The statistical assessment of the pitting corrosion data collected during this study shows that the magnetic field reduces the average depth of the pit population. It also reduces the extreme pit depth values that can be predicted from the maximum values observed in the magnetized samples, with respect to the non-magnetized control samples. Scanning electron microscopy observations show that the magnetic field alters the pit morphology by increasing the pit opening (mouth). It is shown that the observed reduction in the pit depth when a magnetic field is confined to the volume of the corroding material can be explained based on the behavior of the paramagnetic corrosion products under the influence of the local magnetic field gradients produced inside and within the immediate vicinity of stable pits.
Sponsorship	International Petroleum Technology Institute and the Pipeline Division
Starting Page	565
Ending Page	572
Page Count	8
File Format	PDF
ISBN	9780791844205
DOI	10.1115/IPC2010-31389
e-ISBN	9780791838853
Volume Number	2010 8th International Pipeline Conference, Volume 1
Conference Proceedings	2010 8th International Pipeline Conference
Language	English
Publisher Date	2010-09-27
Publisher Place	Calgary, Alberta, Canada
Access Restriction	Subscribed
Subject Keyword	Leakage American petroleum institute Magnetic flux Scanning electron microscopy Magnetization Pipelines Circuits Metals Inspection Ions Steel Wall thickness Optical microscopy Corrosion Magnetic fields Pipes
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

The Effect of Magnetic Fields on Corrosion in Pipeline Steel

Development of Pinhole Corrosion Management Using MFL

Numerical and Experimental Research on Pipeline Magnetic Flux Leakage Testing With Inspection Device of Variable Diameters

Burst Tests on Pipeline Containing Long Real Corrosion Defects

Burst Tests on Pipeline Containing Interacting Corrosion Defects

ILI to ILI Comparisons: Quantifying the Impact of Multiple Inspections

Evaluating a Corrosion Assisted Pipeline Rupture

API 579 Level 3 Assessment of Dents Using High-Resolution ILI Data

Steel pipeline testing using magnetic flux leakage method

Influence of Remanent Magnetization on Pitting Corrosion in Pipeline Steel

Similar Documents

The Effect of Magnetic Fields on Corrosion in Pipeline Steel

Development of Pinhole Corrosion Management Using MFL

Numerical and Experimental Research on Pipeline Magnetic Flux Leakage Testing With Inspection Device of Variable Diameters

Burst Tests on Pipeline Containing Long Real Corrosion Defects

Burst Tests on Pipeline Containing Interacting Corrosion Defects

ILI to ILI Comparisons: Quantifying the Impact of Multiple Inspections

Evaluating a Corrosion Assisted Pipeline Rupture

API 579 Level 3 Assessment of Dents Using High-Resolution ILI Data

Steel pipeline testing using magnetic flux leakage method

Influence of Remanent Magnetization on Pitting Corrosion in Pipeline Steel