Crack growth model for pipelines exposed to concentrated carbonate–bicarbonate solution with high pH

Lu, B.T.; Song, Fang; Gao, Ming; Elboujdaîni, M.

doi:10.1016/j.corsci.2010.08.023

Cited by 53 publications

(37 citation statements)

References 42 publications

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“…If breakdown occurs in passive film, the material will suffer from pitting and SCC. So far, extensive studies [12][13][14][15][16] have been performed to reveal that the existence of various solvated species such as chloride, bicarbonate, and carbonate ions is in close relationship with the film formation process and the properties of the film. This therefore affects the initiation and propagation of the stress corrosion cracks.…”

Section: Introductionmentioning

confidence: 99%

A New Understanding of Stress Corrosion Cracking Mechanism of X80 Pipeline Steel at Passive Potential in High-pH Solutions

Fan

Liu

Guo

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

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Susceptibilities to stress corrosion cracking (SCC) of X80 pipeline steel in relatively concentrated carbonate/ bicarbonate solutions with different chloride ion concentrations or pH value at a passive potential of -200 mV vs SCE were investigated by slow strain rate tensile test. In order to explore the SCC mechanism and the evaluation criterion for the SCC susceptibility of the steel in passive state, electrochemical measurements were taken. Potentiodynamic polarization curves were obtained at different potential sweep rates, and electrochemical impedance spectroscopy measurements were taken after fast polarization to the passive potential. The effects of chloride ion and pH on SCC behaviors of X80 steel at the passive potential were also discussed. The results showed that the SCC mechanism of X80 pipeline steel was greatly influenced by the passive film formed in these solutions. The SCC behaviors followed the film suppressed anodic dissolution mechanism in these circumstances, because the filming process accounted for a considerable proportion of the overall electrode process. The criteria for evaluating the SCC susceptibility of the steel at passive potential were proposed and validated. Decreasing in the concentration of chloride ion or increasing in pH value resulted in the reduction in SCC susceptibility. The existence of chloride ion greatly lowered the passivation tendency and the film stability, while its concentration determined the dissolution rate of the steel matrix. Higher pH value was responsible for the stable and tenacious passive films and the high repassivation capability. It was also inclined to lower the anodic dissolution rate at crack tips by retarding the cathodic oxygen reduction.

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Section: Introductionmentioning

confidence: 99%

A New Understanding of Stress Corrosion Cracking Mechanism of X80 Pipeline Steel at Passive Potential in High-pH Solutions

Fan

Liu

Guo

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

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“…Localized plasticity is frequently attributed to absorption of hydrogen produced by cathodic reduction of water accompanying corrosion [5,6]. The present work concerns "high-pH" IGSCC of high-strength low-alloy steels used for pipelines, which occurs in the pH range 8 to 11 in the potential region of active steel dissolution [7][8][9][10]. Attention is focused on the nature and mechanism of material property changes during the early development of intergranular corrosion attack that precedes SCC.…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation study of corrosion-induced grain boundary degradation in a pipeline steel

Yavas

Mishra

Alshehri

et al. 2018

Electrochemistry Communications

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High-strength low-alloy steels used for oil and gas pipelines are vulnerable to intergranular stress corrosion cracking in moderately alkaline soils. The mechanism of corrosion-induced embrittlement under such conditions is not yet understood. Nanoindentation was used to detect localized degradation of mechanical properties near internal grain boundaries of X-70 steel undergoing intergranular corrosion at active dissolution potentials at pH 8.2. The measurements identified a one-micron thick mechanically-degraded layer with 25% reduced hardness near corroded grain boundaries. It is suggested that the corrosion process may introduce an active softening agent, possibly non-equilibrium lattice vacancies generated by oxidation. KeywordsIntergranular corrosion, Dissolution-induced degradation, Stress corrosion cracking, Grain boundary softening, Nanoindentation Disciplines Aerodynamics and Fluid Mechanics | Aerospace Engineering | Nanoscience and Nanotechnology | Structures and Materials CommentsThis is a manuscript of an article published as Yavas, Denizhan, Pratyush Mishra, Abdullah Alshehri, Pranav Shrotriya, Kurt R. Hebert, and Ashraf F. Bastawros. "Nanoindentation study of corrosion-induced grain boundary degradation in a pipeline steel." Electrochemistry Communications 88 (2018) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D MA N U S C R I P T AbstractHigh-strength low-alloy steels used for oil and gas pipelines are vulnerable to intergranular stress corrosion cracking in moderately alkaline soils. The mechanism of corrosion-induced embrittlement under such conditions is not yet understood. Nanoindentation was used to detect localized degradation of mechanical properties near internal grain boundaries of X-70 steel undergoing intergranular corrosion at active dissolution potentials at pH 8.2. The measurements identified a one-micron thick mechanicallydegraded layer with 25% reduced hardness near corroded grain boundaries. It is suggested that the corrosion process may introduce an active softening agent, possibly non-equilibrium lattice vacancies generated by oxidation.

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“…A possible explanation for this effect may be as follows: during cycling, stress can assist pit growth by complementing the electrochemical process and increasing the corrosion current density [15,53,[56][57][58][59][60]. The synergism between stress and corrosion rate as well as pit growth rate is well documented for steel [53][54][55][56][57][58][59][60][61][62][63], but little study is available for aluminum alloys [15,51]. Gutman [56] outlines a theoretical analysis within the thermodynamic framework for the synergistic effect known as mechanochemistry of materials.…”

Section: Cdm Modeling Of Pit-to-crack Transition In Cfmentioning

confidence: 99%

A continuum damage mechanics model for pit-to-crack transition in AA2024-T3

et al. 2015

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Crack growth model for pipelines exposed to concentrated carbonate–bicarbonate solution with high pH

Cited by 53 publications

References 42 publications

A New Understanding of Stress Corrosion Cracking Mechanism of X80 Pipeline Steel at Passive Potential in High-pH Solutions

A New Understanding of Stress Corrosion Cracking Mechanism of X80 Pipeline Steel at Passive Potential in High-pH Solutions

Nanoindentation study of corrosion-induced grain boundary degradation in a pipeline steel

A continuum damage mechanics model for pit-to-crack transition in AA2024-T3

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