Investigating a Mechanism for Transgranular Stress Corrosion Cracking on Buried Pipelines in Near-Neutral pH Environments

Asher, Stefanie; Leis, Brian N.; Colwell, Jeffrey A.; Singh, Preet M.

doi:10.5006/1.3278311

Cited by 26 publications

(11 citation statements)

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“…Although numerous previous studies have been reported concerning the corrosion behavior of HSLA steel [9][10][11][12][13][14][15][16][17], limited investigations are focused on the effect of microstructure variation on the corrosion behavior of HSLA steel.…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructure variation on the corrosion behavior of high-strength low-alloy steel in 3.5wt% NaCl solution

Guo

Liu

et al. 2015

Int J Miner Metall Mater

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The effect of microstructure variation on the corrosion behavior of high-strength low-alloy (HSLA) steel was investigated. The protective property of the corrosion product layer was also explored. Experimental results reveal that the type of microstructure has significant effect on the corrosion resistance of HSLA steel. The measurement results of weight loss, potentiodynamic polarization curves, and electrochemical impedance spectroscopy indicate that the steel with acicular ferrite microstructure exhibits the lowest corrosion rate. Martensite exhibits a reduced corrosion resistance compared with polygonal ferrite. It is found that the surface of the acicular ferrite specimen uniformly covered by corrosion products is seemingly denser and more compact than those of the other two microstructures, and can provide some amount of protection to the steel; thus, the charge transfer resistance and modulus values of the acicular ferrite specimen are the largest. However, corrosion products on martensite and polygonal ferrite are generally loose, porous, and defective, and can provide minor protectiveness; thus, the charge transfer resistance values for polygonal ferrite and martensite are lower.

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Section: Introductionmentioning

confidence: 99%

Effect of microstructure variation on the corrosion behavior of high-strength low-alloy steel in 3.5wt% NaCl solution

Guo

Liu

et al. 2015

Int J Miner Metall Mater

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“…At this period, the iron oxide passive layer started to form but is still weak, porous and thin, thus its protection capability is limited [9]. As the corrosion process approached the fourth week, the corrosion rate dropped due to the fact that the passive film was developed and became more stable, stronger, denser, more uniform and strongly bonded to the steel's surface [10]. The corrosion species are then obstructed to reach the surface, resulting in a low corrosion rate [11].…”

Section: Corrosion Reactionmentioning

confidence: 99%

Investigation of corrosion resistance of high-strength low-alloy (HSLA) steel in fresh and salt water for pipeline application

Qaban

Naher

2019

AIP Conference Proceedings

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“…Like all other SCC events, pipeline SCC occurs when three conditions are met: a corrosive environment, susceptible, and tensile stress [2]. It is now recognized that there are two forms of external SCC in buried pipelines, namely high-pH SCC (also referred to as classical SCC) and near-neutral pH SCC (also referred to as low-pH SCC) [3][4][5][6][7][8]. The high-pH form is by far the most reported form of SCC [8].…”

Section: Introductionmentioning

confidence: 99%

“…TGSCC may occur in the absence or when the cathodic protection (CP) has failed. Also, the occurrence of TGSCC has been associated to hydrogen production, permeation, and embrittlement, but the precise mechanism has not been identified [7,9,10].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Colonies of Stress Corrosion Cracks in Gas Pipelines of API 5L X65 Steel

Ribeiro

Magnol

Tavares

et al. 2021

J Fail. Anal. and Preven.

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Gas pipelines are important and strategic systems for gas transportation across long distances. Thousands of kilometers of gas pipelines are installed in different regions of the world. Stress corrosion cracking of gas pipelines is an important issue due to leak and explosion risks involved. In this work, longitudinal and circumferential colonies of cracks found in a 30 years old Brazilian gas pipeline were characterized. The microstructure and mechanical properties of the API 5L X65 steel, on which the pipe was fabricated, were characterized. The toughness and tensile properties met the requirements of X65 and X70 grades. The scanning electron microscopy analysis of colonies of cracks (circumferential and longitudinal) revealed that they were transgranular stress corrosion cracks (TGSCC), caused by soil. The TGSCC occurs in near-neutral pH electrolytes, nucleating preferentially in external pits. The lifetime expected for the pipeline was 30 years, and the old asphaltic coating was damaged in several points of the line, which is also a determinant factor for the occurrence of this type of failure. The parts with colonies of cracks were identified for emergencial replacement before the complete substitution scheduled for the near future.

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Investigating a Mechanism for Transgranular Stress Corrosion Cracking on Buried Pipelines in Near-Neutral pH Environments

Cited by 26 publications

References 1 publication

Effect of microstructure variation on the corrosion behavior of high-strength low-alloy steel in 3.5wt% NaCl solution

Effect of microstructure variation on the corrosion behavior of high-strength low-alloy steel in 3.5wt% NaCl solution

Investigation of corrosion resistance of high-strength low-alloy (HSLA) steel in fresh and salt water for pipeline application

Characterization of Colonies of Stress Corrosion Cracks in Gas Pipelines of API 5L X65 Steel

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