Stress corrosion cracking behavior of X70 pipe steel in an acidic soil environment

Liu, Z.Y.; Li, X.G.; Du, Cuiwei; Zhai, Guoli; Cheng, Y. Frank

doi:10.1016/j.corsci.2008.05.011

Cited by 186 publications

(59 citation statements)

References 21 publications

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“…This was different from the result in an acidic soil environment observed by Liu et al [21]. It seemed inappropriate to evaluate the electrochemical characteristic of non-crack tip area by using i f directly, because the influence of filming process was not negligible.…”

Section: Electrochemical Criterion For Evaluating the Susceptibility mentioning

confidence: 86%

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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: Electrochemical Criterion For Evaluating the Susceptibility mentioning

confidence: 86%

“…During the test, a passive potential of -200 mV versus SCE was adopted, which was chosen according to the potentiodynamic polarization curves. Reduction-in-area loss (I w ) and fracture strength loss (I r ) were introduced to quantify the SCC susceptibility, which are defined as [21]:…”

Section: Experimental Methodsmentioning

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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“…It is seen from the analysis that, from E corr to À850 mV(SCE), the interfacial charge-transfer process contains both cathodic (reaction 1) and anodic (reactions [3][4][5] reactions. Since the anodic process is still important, the interfacial impedance would increase with the potential, as evidenced by the increase in the size of semicircle in this potential range in Fig.…”

Section: Potential Dependence Of the Electrochemical Cathodic Reactiomentioning

confidence: 99%

“…The pipeline SCC, usually occurring below the yield strength of the steel and typically below the design stress ( Ref 3,4), is divided into two categories, i.e., high pH SCC (Ref [5][6][7][8] and near-neutral pH SCC ( . It has been well accepted (Ref 1) that the high pH SCC is attributed to anodic dissolution at the grain boundaries, and is always associated with a concentrated carbonate/bicarbonate environment with a pH of about 9.5.…”

Section: Introductionmentioning

confidence: 99%

Effect of Strain Rate on Cathodic Reaction During Stress Corrosion Cracking of X70 Pipeline Steel in a Near-Neutral pH Solution

Liu

Cheng

2010

J. of Materi Eng and Perform

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The effect of strain rate on cathodic reactions of X70 pipeline steel during stress corrosion cracking in a near-neutral pH solution was investigated by electrochemical impedance spectroscope and potentiodynamic polarization curve measurements as well as slow strain rate tests. A local additional potential model was used to understand mechanistically the role of strain rate in electrochemical cathodic reaction. It was found that an application of elastic stress would not affect the electrochemical stable state of the steel specimen at a macroscopic scale. Under a weak cathodic polarization, the interfacial charge-transfer process occurring on steel contains both cathodic and anodic reactions. Since the anodic reaction process is still significant, localized dissolution could occur even at such a cathodic potential, resulting in generation of corrosion pits. These pits could be the start sites to initiate stress corrosion cracks. Strain rate affects the corrosion reaction, which is associated with the generation of dislocation emergence points and slip steps on the specimen surface, resulting in a negative local additional potential to enhance the cathodic reaction locally.

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“…At relatively low potential, the steel cracking is based primarily on the anodic dissolution mechanism. When the applied potential increases negatively, hydrogen is involved in the cracking process, resulting in a transgranular cracking mode (Liu et al, 2008). associated with intergranular cracking, while the type involving lower pH (<6) is associated mainly with transgranular cracking.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Stress Corrosion Cracking on Pipeline Steels Weldments Used in the Petroleum Industry by Slow Strain Rate Tests

Contreras¹,

Salazar²,

Albiter³

et al. 2011

Arc Welding

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Stress corrosion cracking behavior of X70 pipe steel in an acidic soil environment

Cited by 186 publications

References 21 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

Effect of Strain Rate on Cathodic Reaction During Stress Corrosion Cracking of X70 Pipeline Steel in a Near-Neutral pH Solution

Assessment of Stress Corrosion Cracking on Pipeline Steels Weldments Used in the Petroleum Industry by Slow Strain Rate Tests

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