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Cathodic Protection Effect on the Assessment of SCC Susceptibility of X52 Pipeline Steel

Published online by Cambridge University Press:  01 February 2011

A. Contreras ,
E. Sosa  and
M. A. Espinosa-Medina
A. Contreras
Affiliation:
Instituto Mexicano del Petróleo, Programa de Integridad de Ductos, Eje Central Lázaro Cárdenas Norte No. 152, Col. San Bartolo Atepehuacan, C.P. 07730, México. Tel: +52 (55) 9175-8194, Fax: +52 (55) 9175-6429 E-mail: acontrer@imp.mx
E. Sosa
Affiliation:
Instituto Mexicano del Petróleo, Programa de Integridad de Ductos, Eje Central Lázaro Cárdenas Norte No. 152, Col. San Bartolo Atepehuacan, C.P. 07730, México. Tel: +52 (55) 9175-8194, Fax: +52 (55) 9175-6429 E-mail: acontrer@imp.mx
M. A. Espinosa-Medina
Affiliation:
Instituto Mexicano del Petróleo, Programa de Integridad de Ductos, Eje Central Lázaro Cárdenas Norte No. 152, Col. San Bartolo Atepehuacan, C.P. 07730, México. Tel: +52 (55) 9175-8194, Fax: +52 (55) 9175-6429 E-mail: acontrer@imp.mx
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Abstract

Assessment of anodic and cathodic potentials on stress corrosion cracking (SCC) of API X52 pipeline steel through slow strain rate tests (SSRT) was studied. The SSRT were carried out in a NS4 solution to simulated dilute ground water that has been found to be associated with SCC of pipelines. SSRT were performed and evaluated in air and in the NS4 solution at room temperature at an extension rate of 1×10-6 in/sec. Tests were performed at controlled electrochemical polarization potentials, both anodic and cathodic (100, 200, 400 mV) versus the open circuit corrosion potential. The results of reduction in area ratio (RAR), time to failure ratio (TFR) and plastic elongation ratio (PER) of the specimens tested in the soil solution indicate that X52 pipeline steel was susceptible to SCC at cathodic potentials. These specimens showed a brittle type of fracture with transgranular appearance. The SCC proceess and mechanism of X52 steel in the NS4 solution is mixed-controlled by both anodic dissolution and the hydrogen involvement. At positive potentials the SCC is based mainly on the anodic dissolution mechanism. When the applied potentials shifted negatively, the SCC on the steel follows mainly hydrogen embrittlement mechanism. This mechanism was confirmed through the internal cracks observed in the specimens.

Keywords

SteelCoatingCorrosionEmbrittlementStress/Strain relationship.
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1242: Symposium 4 – Materials Characterization , 2009 , S4-53
Copyright
Copyright © Materials Research Society 2010

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