Stress corrosion of pipeline steel under occluded coating disbondment in a red soil environment

Mao, Yan; Sun, Cheng; Xu, Jin; Wu, Tangqing; Yang, Shuang; Ke, Wei

doi:10.1016/j.corsci.2015.01.001

Cited by 48 publications

(36 citation statements)

References 39 publications

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“…In fact, the combination of hematite and goethite, in most cases are the habitat of acidic soil, and causes re-acidification of the soil during hot climatic conditions. These observations reinforce the literature and previous findings [19,20]. …”

Section: Phase Identificationsupporting

confidence: 83%

“…In fact, the retrieved steel surface was covered by a black layer corrosion product (magnetite). The similar results were also obtained by Yan et al [19,20], and that shows an occurred rapid corrosion attack on the electrode. …”

Section: X-ray Diffraction (Xrd) Analysissupporting

confidence: 79%

“…which is a part of a relative stable microstructure of LCS. Based on Akbarzadeh et al [18] discovery, cementite is accumulated on the surface after preferential dissolution of the active ferrite phase, and actually provide an area for cathodic reactions and that consequent to galvanic coupling with ferrite [19]. In most cases, the ferrite-pearlite structures are normal during corrosion of bare LCS.…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 99%

See 2 more Smart Citations

Effects of Key Engineering Soil Parameters on the Surface of Pipeline Steel Under Different Environmental Exposures

Khoele¹,

Delport²

2017

Jour. Mater. Sci. Eng. Adv. Tech.

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Pipeline steel (PS) electrodes were buried in seven different soil samples (SSs), and they characterized by weight loss (WL), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and X-ray diffraction (XRD). WL measurements confirmed previous electrochemical measurements in terms of excessive corrosion rates under acidic media (SS 4). The SEM/EDX analysis also revealed a severe ulcerous corrosion attack on the entire surface of the electrode in SS 4. In fact, the retrieved steel surface was covered by a black layer of corrosion products; and the XRD analysis on corrosion products encompassed iron phases: goethite, hematite, and ferryhidrite. These oxides are the habitats of most acidic soils, and cause re-acidification of the soils during hot climatic conditions. Overall, analysis showed that the corrosion of buried PSs differ from environment to environment, and the corrosion rates more closely related to pH and soil resistivity. Distinctively, corrosion rates were least under neutral environment (soil with pH 7.7) and higher in soil with pH value of 3.1.

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Section: Phase Identificationsupporting

confidence: 83%

Section: X-ray Diffraction (Xrd) Analysissupporting

confidence: 79%

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 99%

See 1 more Smart Citation

Effects of Key Engineering Soil Parameters on the Surface of Pipeline Steel Under Different Environmental Exposures

Khoele¹,

Delport²

2017

Jour. Mater. Sci. Eng. Adv. Tech.

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“…There have been works to measure and model environmental chemistry and electrochemistry of the electrolyte trapped under CP shielding or non-shielding coatings [14][15][16][17]. Moreover, lab tests have been conducted attempting to understand the CP shielding behavior of some pipeline coatings through electrochemical measurements, including potentiostatic current and electrochemical impedance spectroscopy [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Study of cathodic protection shielding under coating disbondment on pipelines

Kuang

Cheng

2015

Corrosion Science

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“…A trapped thin electrolyte layer is known responsible for SCC of high-strength low-alloy (HSLA) pipeline steel under disbonded coating [14][15][16][17], where the pipeline surface underlying cannot be protected by either coating or CP. The thin electrolyte layer forms on pipeline surface as consequence of coating adhesion being lost and electrolytes penetrating into the crevice of disbonded area.…”

Section: Introductionmentioning

confidence: 99%

EIS analysis on stress corrosion initiation of pipeline steel under disbonded coating in near-neutral pH simulated soil electrolyte

et al. 2016

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Initiation of stress corrosion of X80 high strength low alloy (HSLA) pipeline steel in a near-neutral pH environment was investigated in a crevice cell simulating coating disbondment. Multi specimens were loaded simultaneously by a loading frame. EIS was applied to characterize behavior of SCC and local electrochemical process. Results indicate that the steel under disbonded coating is in an active dissolution state. In-depth profile of the reciprocal charge transfer resistance shows a decreasing trend over distance from the opening. A shielding factor was proposed to characterize shielding effect of disbondment on stress corrosion of pipeline steels.

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Stress corrosion of pipeline steel under occluded coating disbondment in a red soil environment

Cited by 48 publications

References 39 publications

Effects of Key Engineering Soil Parameters on the Surface of Pipeline Steel Under Different Environmental Exposures

Effects of Key Engineering Soil Parameters on the Surface of Pipeline Steel Under Different Environmental Exposures

Study of cathodic protection shielding under coating disbondment on pipelines

EIS analysis on stress corrosion initiation of pipeline steel under disbonded coating in near-neutral pH simulated soil electrolyte

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