ERA

Download the full-sized PDF of Investigation of Corrosion and Crack Morphology Behavior under Disbonded Coatings on PipelinesDownload the full-sized PDF

Analytics

Share

Permanent link (DOI): https://doi.org/10.7939/R3NZ80V90

Download

Export to: EndNote  |  Zotero  |  Mendeley

Communities

This file is in the following communities:

Graduate Studies and Research, Faculty of

Collections

This file is in the following collections:

Theses and Dissertations

Investigation of Corrosion and Crack Morphology Behavior under Disbonded Coatings on Pipelines Open Access

Descriptions

Other title
Subject/Keyword
Stress Corrosion Cracking
Corrosion
Pipelines
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Chevil, Karina
Supervisor and department
Chen, Weixing (Chemical and Materials Engineering)
Examining committee member and department
Eadie, Reg (Chemical and Materials Engineering)
Zhang, Hao (Chemical and Materials Engineering)
Luo, Jingli (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Materials Engineering
Date accepted
2015-06-19T08:21:31Z
Graduation date
2015-11
Degree
Master of Science
Degree level
Master's
Abstract
Coating disbondment on pipelines is a common phenomenon that leads to exposure of the pipeline metal to the surrounding soil and ground water solutions. The exposure of pipelines to those corrosive environments is associated with development of corrosion and Stress Corrosion Cracking (SCC) on the pipeline steel. Despite the wide study of the electrochemical conditions underneath disbonded coatings, little information has been provided regarding the correlation between the coating disbondment gap size, the corrosion rate of the steel, and the SCC shallow crack morphology at the disbondment location. This research aims to understand the effect of the pipeline coating conditions on corrosion and near-neutral pH SCC of the underlying pipeline steel. The corrosion behavior and rate of pipeline steel under coating disbondment gaps of varying sizes was investigated through field data and experimental studies. The experimental studies were performed on X-65 pipeline steel coupons in anaerobic conditions, with various CO2 concentrations (2%, 5%, and 20% CO2), without Cathodic Protection (CP). The steel coupons were placed into a vertical coupon holder simulating a coating disbondment on a pipeline. The findings showed that a metal ion concentration cell may develop under narrower coating disbondments. In the analysis of the field data, dig reports provided by a Canadian gas transportation company were analyzed for cases of anaerobic corrosion under tape and asphalt coatings. The results obtained through field data analysis correlated with the experimental findings, suggesting that concentration cells under narrow coating disbondments may be responsible for enhanced corrosion on pipelines in the field. The effect of the coating disbondment gap size on the morphology of shallow cracks was analyzed in X-60 pipeline steel, in 5% CO2 under triangular tensile loading under coating disbondment gaps of various sizes. The results showed that the coating disbondment gap size affects the morphology of the shallow cracks under the disbondment.
Language
English
DOI
doi:10.7939/R3NZ80V90
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
K. Chevil, W. Chen, R,. Eadie, A. Eslami, R. Kania, R. Worthingham, and G. Van Boven. 2012. "Developing Cathodic Protection Based on Disbondment Geometry", ASME. 45134; Volume 2: Pipeline Integrity Management: 583-590.September 24, 2012. IPC2012-90675. K. Chevil, W. Chen, R. Eadie, J. Been, R. Kania, and G. Van Boven. “Correlating Corrosion Field Data with Experimental Findings for the Development of Pipeline Mitigation Strategies”, unpublished work, currently revised for IPC 2014, Calgary, Alberta: Paper 33678.

File Details

Date Uploaded
Date Modified
2015-06-19T14:21:32.618+00:00
Audit Status
Audits have not yet been run on this file.
Characterization
File format: pdf (PDF/A)
Mime type: application/pdf
File size: 6435131
Last modified: 2016:06:24 18:30:29-06:00
Filename: Chevil_Karina_201506_MSc.pdf
Original checksum: 81566029e84d5a4272966478fd20cd32
Activity of users you follow
User Activity Date