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Corrosion Engineering, Science and Technology
The International Journal of Corrosion Processes and Corrosion Control
Volume 50, 2015 - Issue 4
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Research Papers

Characterisation of soil/pipe interface at a pipeline failure after 36 years of service under impressed current cathodic protection

L. Quej-AkéInstituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte No. 152, C.P.07730, México D.F., Mexico
,
N. NavaInstituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte No. 152, C.P.07730, México D.F., Mexico
,
M. A. Espinosa-MedinaFacultad de Ingeniería Mecánica Universidad Michoacana de San Nicolás de Hidalgo, C.P.58000, Morelia, Mexico
,
H. B. LiuInstituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte No. 152, C.P.07730, México D.F., Mexico
,
J. L. AlamillaInstituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte No. 152, C.P.07730, México D.F., Mexico
&
E. SosaInstituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas Norte No. 152, C.P.07730, México D.F., MexicoCorrespondence[email protected]
Pages 311-319 | Received 22 Nov 2013, Accepted 01 Aug 2014, Published online: 15 Aug 2014
 
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Abstract

Study on corrosion behaviour of buried pipeline in saline soil is presented, the pipeline is protected by coating and impressed current cathodic protection system. In this work, spectrometric and spectroscopic techniques were used to characterise the pipe/coating/soil interfaces. The results show the coating/pipe interface forms corrosion products including the following phases: magnetite, goethite, akaganeite and hematite. However, the main phases found at coating/soil interface are magnetite and ferric ion. The behavior is consistent with the corrosion of carbon steel in soil with oxygen and chloride ion. The reaction paths are proposed under the conditions of deteriorated coating, cathodic protection, saline soil and seasonal fluctuations.

This article is part of the following collections:
The Science and Technology of Cathodic Protection

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