Hydrogen-Facilitated Anodic Dissolution-Type Stress Corrosion Cracking of Pipeline Steels in Near-Neutral pH Solution

Gu, Bill; Luo, Jing; Mao, X.

doi:10.5006/1.3283971

Cited by 113 publications

(36 citation statements)

References 2 publications

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“…This agrees w i t h the two mechanisms that have been proposed for near-neutralpH SCC by Gu et al (1999) and Wang et al (1998). However, fürther testing is required to determine which of these mechanisms is more likely.…”

Section: Polarization Resistancesupporting

confidence: 73%

“…Absorbed hydrogen can also lead to the breakdom of passive films on stainless steels (Yane et al. 1999) or accelerate corrosion processes (Gu et al, 1999). Although the production of hydrogen during a corrosion process is small, hydrogen can accumulate at the tip of a crack and possibly increase the local hydrosen concentration to a harmfil level.…”

Section: Hydrogertmentioning

confidence: 99%

“…Although the production of hydrogen during a corrosion process is small, hydrogen can accumulate at the tip of a crack and possibly increase the local hydrosen concentration to a harmfil level. As rnentioned in section 2.8.9, Gu et al (1999) suspected that the corrosion rate would be increased due to several factors including the interaction between stress and hydrogen. This hypothesis was not tested, however.…”

Section: Hydrogertmentioning

confidence: 99%

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Effect of Microstructure on Near-Neutral-pH SCC

Bulger

Luo

2000

Volume 2: Integrity and Corrosion; Offshore Issues; Pipeline Automation and Measurement; Rotating Equipment

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Three components are required for stress corrosion cracking: stress, an environment and a susceptible alloy. The environment that causes near-neutral-pH SCC has been established as a dilute bicarbonate environment and the effect of stress on this type of SCC has received a considerable amount of research; however, the third component, the susceptible alloy, has received little research. The effect of microstructure on near-neutral-pH SCC was investigated using the slow strain rate test. The effect of the microstructure on the corrosion properties is also investigated using polarization resistance tests, potentiodynamic scans and electrochemical impedance spectroscopy. The results indicate that the microstructure influences both the SCC and corrosion behaviour.

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Section: Polarization Resistancesupporting

confidence: 73%

Section: Hydrogertmentioning

confidence: 99%

Section: Hydrogertmentioning

confidence: 99%

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Effect of Microstructure on Near-Neutral-pH SCC

Bulger

Luo

2000

Volume 2: Integrity and Corrosion; Offshore Issues; Pipeline Automation and Measurement; Rotating Equipment

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“…In nearneutral pH environment, SCC occurring on low-grade steel pipelines, such as X52 and X70 steels, is usually attributed to a synergistic effect of hydrogen and stress on the local dissolution of steel at crack tip [6][7][8][9][10][11][12][13][14][15]. However, relevant study on the electrochemical corrosion and SCC behavior of high-strength pipeline steels has been very limited.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical corrosion behavior of X80 pipeline steel in a near‐neutral pH solution

Xue¹,

Cheng²

2010

Materials & Corrosion

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In this work, the electrochemical corrosion behavior of X80 pipeline steel was investigated in a near-neutral pH solution using electrochemical impedance spectroscopy (EIC) and photo-electrochemical (PEC) measurements as well as X-ray photo-electron spectroscopy (XPS) technique. The effects of hydrogencharging and stress were considered. The results show that the steel is in an active dissolution state, and a layer of corrosion product is formed and deposited on the electrode surface, which is subjected to further oxidation to form ferric oxide and hydroxide. Photo-illumination enhances anodic dissolution of the steel when it is under anodic polarization due to destroying of the corrosion product film. When the steel is under cathodic polarization, the cathodic current density decreases upon laser illumination due to the photo-oxidation of hydrogen atoms generated during cathodic reactions, which behaves as an anodic reaction to offset the cathodic current density. Hydrogen-charging and stress decrease the corrosion resistance of the steel and enhance the dissolution rate of the steel.

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“…Near-neutral stress corrosion cracking analysis in some studies [65,66] has suggested the acceleration of anodic current due to hydrogen-facilitated free energy increments and strong synergistic interactions between the dissolved hydrogen and the local stress field around the crack tip. However, such a strong change in the free energy and synergistic effect is not supported by the experimental results found by other studies [67][68][69].…”

Section: Mechanical Lossesmentioning

confidence: 99%

A Thermodynamic Entropy Approach to Reliability Assessment with Applications to Corrosion Fatigue

Imanian¹,

Modarres²

2015

Entropy

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This paper outlines a science-based explanation of damage and reliability of critical components and structures within the second law of thermodynamics. The approach relies on the fundamentals of irreversible thermodynamics, specifically the concept of entropy generation as an index of degradation and damage in materials. All damage mechanisms share a common feature, namely energy dissipation. Dissipation, a fundamental measure for irreversibility in a thermodynamic treatment of non-equilibrium processes, is quantified by entropy generation. An entropic-based damage approach to reliability and integrity characterization is presented and supported by experimental validation. Using this theorem, which relates entropy generation to dissipative phenomena, the corrosion fatigue entropy generation function is derived, evaluated, and employed for structural integrity and reliability assessment of aluminum 7075-T651 specimens.

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Hydrogen-Facilitated Anodic Dissolution-Type Stress Corrosion Cracking of Pipeline Steels in Near-Neutral pH Solution

Cited by 113 publications

References 2 publications

Effect of Microstructure on Near-Neutral-pH SCC

Effect of Microstructure on Near-Neutral-pH SCC

Electrochemical corrosion behavior of X80 pipeline steel in a near‐neutral pH solution

A Thermodynamic Entropy Approach to Reliability Assessment with Applications to Corrosion Fatigue

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