TY - JOUR
T1 - Study of pitting corrosion in line-pipe steel under the influence of remanent magnetization
AU - Espina-Hernández, J. H.
AU - Caleyo, F.
AU - Hallen, J. M.
N1 - Publisher Copyright:
Copyright 2009, Brazilian Petroleum, Gas and Biofuels Institute - IBP.
PY - 2009
Y1 - 2009
N2 - 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- and SO24- 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.
AB - 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- and SO24- 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.
UR - http://www.scopus.com/inward/record.url?scp=85044655801&partnerID=8YFLogxK
M3 - Artículo de la conferencia
AN - SCOPUS:85044655801
SN - 2447-2069
VL - 2009-September
JO - Rio Pipeline Conference and Exposition, Technical Papers
JF - Rio Pipeline Conference and Exposition, Technical Papers
T2 - 2009 Rio Pipeline Conference and Exposition
Y2 - 22 September 2009 through 24 September 2009
ER -