Synergistic effect of stray current and stress on corrosion of API X65 steel

Wang, Xinhua; Tang, Xinxin; Wang, Liwei; Wang, Cui; Zhou, Wenqing

doi:10.1016/j.jngse.2014.09.007

Cited by 45 publications

(23 citation statements)

References 19 publications

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“…At some areas in the passive region, an increase in the current density of up to 200% is seen between the zero strain and 100% YS strain condition, while in the SCC range up to a 300% increase is observed. These results seem reasonable and agree with the general trend seen in past studies . This provides additional support that for the inclined SCC affected steel, even just elastic strain has a significant effect on the current density and film stability.…”

Section: Potentiodynamic Response Of X65 To Strainsupporting

confidence: 92%

“…Crack tip strain enhanced electrochemistry refers to both increased current density and hence dissolution, along with lower film stability in the areas of high strain near the crack tip. Evidence exists in the literature for a link between strain and current density . Strain has also been shown to have an effect on film stability .…”

Section: Introductionmentioning

confidence: 99%

“…One proposed reason for the inclination by the prior studies was an unspecified change in mechanism, which other literature suggests may be from strain dependant electrochemistry . In order to validate this proposed mechanism to limit the effect of crack interaction (the most significant variable), relatively isolated cracks have to be selected.…”

Section: Introductionmentioning

confidence: 99%

“…Of note is that the dissolution is governed by charge exchanged, Q F , which is also proportional to the current density at the crack tip . Various authors have shown that plastic deformation can change the current density at a given potential. There has also been an evidence of a shift in the corrosion potential under elastically strained X65 steel, with pits causing microplastic events, which could suggest that the balance between dissolution and film formation could shift if the metal is locally strained.…”

Section: Introductionmentioning

confidence: 99%

“…Various authors have shown that plastic deformation can change the current density at a given potential. There has also been an evidence of a shift in the corrosion potential under elastically strained X65 steel, with pits causing microplastic events, which could suggest that the balance between dissolution and film formation could shift if the metal is locally strained. Because zones of high plasticity occur at shear angles ahead of the crack tip under mode I stresses, it follows that current density may be higher at these angles, increasing the propensity for dissolution.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

2D modelling of inclined intergranular stress corrosion crack paths

Griggs

Gamboa

Lavigne

2016

Fatigue Fract Eng Mat Struct

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Inclined high pH stress corrosion cracking (SCC) is a type of intergranular environmental cracking in gas pipelines, which differs from typical SCC by propagating at an angle from the wall direction. Investigations of Australian and Canadian inclined SCC colonies have not provided a clear indicator of a cause for the abnormal crack growth direction. This paper addresses the possibility of crack tip strain enhanced electrochemistry causing the inclination. Potentiodynamic tests were conducted to quantify the influence of strain on the electrochemistry, and strain was found to increase current density up to 300% in the SCC region. A model was developed that incorporates crack tip strain driven SCC growth, which showed good agreement with field grown cracks, and the aspect ratio of the grains was shown to have an effect on the inclination angle. The results indicate that crack tip strain enhanced electrochemistry is a plausible cause for inclined SCC.

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Section: Potentiodynamic Response Of X65 To Strainsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

2D modelling of inclined intergranular stress corrosion crack paths

Griggs

Gamboa

Lavigne

2016

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

A review of modelling high pH stress corrosion cracking of high pressure gas pipelines

Griggs

Gamboa

Lavigne

2015

Materials and Corrosion

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Modelling of intergranular stress corrosion cracking (SCC) in pipelines is an important field of study as predictive techniques are integral to pipeline integrity and management. An inclination of the SCC propagation direction has been observed for some pipelines, which is not predictable using existing models as they assume perpendicular crack growth. A review has been conducted to identify the applicable techniques from existing models, as well as the gaps in current knowledge. Existing work in crack growth rates, stress formulations and microstructural representations are reviewed. Mechanical dependency of the electrochemical response is identified as a gap and proposed for inclusion in a model alongside the other areas reviewed.

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Synergistic effects of corrosion time and stress on corrosion of casing steel in H₂S/CO₂ gas wells

Zhi

Zhang

Liu³

et al. 2017

Materials & Corrosion

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Effect of corrosion duration on C110 casing steel was investigated in the stimulated gas field solution containing both 1 MPa CO2 and 1.5 MPa H2S at 90 °C by using a high temperature autoclave. And the corrosion rate prediction model was established based on the corrosion duration effect. In addition, effect of stress on corrosion of steel was analyzed from the thermodynamics and electrochemistry theories, moreover, the casing corrosion life prediction model was established under three axis stress state with considering the influences of stress and corrosion effect. The results reveal that the corrosion rate of C110 casing steel decreases significantly as corrosion time increases, then gradually tends toward stability. In addition, the casing steel is subjected to load and corrosion solution, the thermodynamic activity and the electrochemical reaction potential are changed, ultimately aggravating the process of corrosion. Compared to corrosion time and wall thickness, the internal pressure is the main factor governing the casing corrosion. Therefore, it is suggested that the synergistic effects of corrosion time and stress should be considered in casing safety design and operation.

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Synergistic effect of stray current and stress on corrosion of API X65 steel

Cited by 45 publications

References 19 publications

2D modelling of inclined intergranular stress corrosion crack paths

2D modelling of inclined intergranular stress corrosion crack paths

A review of modelling high pH stress corrosion cracking of high pressure gas pipelines

Synergistic effects of corrosion time and stress on corrosion of casing steel in H₂S/CO₂ gas wells

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Synergistic effect of stray current and stress on corrosion of API X65 steel

Cited by 45 publications

References 19 publications

2D modelling of inclined intergranular stress corrosion crack paths

2D modelling of inclined intergranular stress corrosion crack paths

A review of modelling high pH stress corrosion cracking of high pressure gas pipelines

Synergistic effects of corrosion time and stress on corrosion of casing steel in H2S/CO2 gas wells

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Product

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Synergistic effects of corrosion time and stress on corrosion of casing steel in H₂S/CO₂ gas wells