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Study of pitting corrosion in line-pipe steel under the influence of remanent magnetization

Abstract

The influence of remanent magnetization on pitting corrosion in line-pipe steels 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 in-line inspection based on magnetic flux leakage. The samples were magnetized using rings of the same grade as the investigated steel. Immediately after magnetization, the investigated samples were subjected to pitting by immersing them in a solution containing dissolved Cl{sup -} and SO{sup 2-}{sub 4} and ions. The pitting experiments were conducted during a seven days period. The pit depth distribution and the maximum pit depth in each sample were recorded and used to conduct extreme value analyses of the pitting process in magnetized and non-magnetized control samples. 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 and also the extreme pit depth values that can be predicted from the maximum values observed in the magnetized samples in comparison with to the non-magnetized control samples. Scanning electron microscopy observations show that the magnetic field alters the  More>>
Authors:
Espina-Hernandez, J H; Caleyo, F; Hallen, J M [1] 
  1. Instituto Politecnico Nacional (IPN), Zacatenco (Mexico)
Publication Date:
Jul 01, 2009
Product Type:
Conference
Report Number:
ETDE-BR-1458
Resource Relation:
Conference: Rio pipeline 2009 conference and exposition, Rio de Janeiro, RJ (Brazil), 22-24 Sep 2009; Other Information: Code: Trabalho 1274.pdf
Subject:
36 MATERIALS SCIENCE; PIPELINES; INSPECTION; PITTING CORROSION; MAGNETIZATION; MAGNETIC FIELDS; SCANNING ELECTRON MICROSCOPY; MAGNETIC FLUX; LEAKS; EXPERIMENTAL DATA
OSTI ID:
21321056
Research Organizations:
Instituto Brasileiro de Petroleo, Gas e Biocombustiveis (IBP), Rio de Janeiro, RJ (Brazil)
Country of Origin:
Brazil
Language:
English
Other Identifying Numbers:
TRN: BR1003635
Availability:
Commercial reproduction prohibited; OSTI as DE21321056
Submitting Site:
BR
Size:
8 pages
Announcement Date:
Jul 02, 2010

Citation Formats

Espina-Hernandez, J H, Caleyo, F, and Hallen, J M. Study of pitting corrosion in line-pipe steel under the influence of remanent magnetization. Brazil: N. p., 2009. Web.
Espina-Hernandez, J H, Caleyo, F, & Hallen, J M. Study of pitting corrosion in line-pipe steel under the influence of remanent magnetization. Brazil.
Espina-Hernandez, J H, Caleyo, F, and Hallen, J M. 2009. "Study of pitting corrosion in line-pipe steel under the influence of remanent magnetization." Brazil.
@misc{etde_21321056,
title = {Study of pitting corrosion in line-pipe steel under the influence of remanent magnetization}
author = {Espina-Hernandez, J H, Caleyo, F, and Hallen, J M}
abstractNote = {The influence of remanent magnetization on pitting corrosion in line-pipe steels 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 in-line inspection based on magnetic flux leakage. The samples were magnetized using rings of the same grade as the investigated steel. Immediately after magnetization, the investigated samples were subjected to pitting by immersing them in a solution containing dissolved Cl{sup -} and SO{sup 2-}{sub 4} and ions. The pitting experiments were conducted during a seven days period. The pit depth distribution and the maximum pit depth in each sample were recorded and used to conduct extreme value analyses of the pitting process in magnetized and non-magnetized control samples. 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 and also the extreme pit depth values that can be predicted from the maximum values observed in the magnetized samples in comparison with to the non-magnetized control samples. Scanning electron microscopy observations show that the magnetic field alters the pit morphology by increasing the pit mouth opening. (author)}
place = {Brazil}
year = {2009}
month = {Jul}
}