Fundamental investigation of stress corrosion cracking of E690 steel in simulated marine thin electrolyte layer

Hao, Wenkui; Wu, Wei; Luo, Hong; Li, Yong

doi:10.1016/j.corsci.2018.12.029

Cited by 86 publications

(20 citation statements)

References 43 publications

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“…In contrast, the side surface of the fractured sample obtained at the 25 cm location shows some long and wide secondary cracks, some of which definitely originate from the corrosion pits, as marked by the white arrows in Figure 10(d). This shows an anodic dissolution (AD) effect when SCC occurs in the simulated trapped liquid at the crevice bottom (Liu et al , 2019; Wu et al , 2019a). As the distance from the opening increases, the CP potential and the content of Cl − increases, and the pH value decreases, which promote the anodic active dissolution process and inhibit the permeation of hydrogen into steel.…”

Section: Resultsmentioning

confidence: 91%

Microenvironment evolution and SCC behavior of subsea pipeline within disbonded coating crevice in a seawater environment under cathodic protection

Zhang

Liu

et al. 2021

ACMM

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Purpose This paper aims to make clear the sensitive zone of subsea pipeline to stress corrosion cracking (SCC) under a disbonded coating. Design/methodology/approach The change of microenvironment under a disbonded coating in artificial seawater was analyzed by using a rectangular crevice cell. The SCC behavior of subsea pipeline was studied by slow strain rate tensile tests. Findings The microenvironment at the crevice bottom exhibits obvious acidification, Cl- aggregation and cathodic protection potential (CP) rise. Accordingly, the susceptibility of X70 steels to SCC is high due to the intensive anodic dissolution effect. At the opening, hydrogen atom can access into the steel and induce hydrogen embrittlement effect on account of the applied over-protected CP potential, resulting in a relatively high susceptibility to SCC. The corrosiveness of the microenvironment at crevice middle, however, is mild with proper CP potential; thus, the susceptibility of X70 steel to SCC here is lower than that obtained at the opening and the crevice bottom. Originality/value A rectangular crevice cell is built to survey the microenvironment evolution under a disbonded coating in situ. The sensitive zone of subsea pipeline to SCC under a disbonded coating is clarified.

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Section: Resultsmentioning

confidence: 91%

Microenvironment evolution and SCC behavior of subsea pipeline within disbonded coating crevice in a seawater environment under cathodic protection

Zhang

Liu

et al. 2021

ACMM

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“…Then, elongations and reductions in the area were obtained from the stress–strain curves. Furthermore, the SCC susceptibility of the L80 steel was calculated by Equations (2)–(4): [ 30 , 31 , 32 ]

where I δ , I ψ , and I R m are the susceptibilities of SCC calculated by different parameters; δ , ψ , and R m are the elongations, reduction of area, and tensile strength, respectively; subscript s and subscript 0 represent the parameters of steel in corrosion medium and air, respectively. All tests were repeated three times for reliable results.…”

Section: Methodsmentioning

confidence: 99%

Effect of Service Environmental Parameters on Electrochemical Corrosion Behavior of L80 Casing Steel

Sun

Cui

et al. 2021

Materials

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The corrosion behavior of L80 casing steel was studied in a simulating annulus environment using the electrochemical measurement method, immersion test, and tensile test under a high-temperature and high-pressure H2S/CO2 environment. The partial pressure of CO2 (PCO2), the partial pressure of H2S (PH2S), water content, and preloading stress remarkably affected the corrosion behavior of L80 steel. The influence of PCO2 on stress corrosion cracking (SCC) susceptibility has an inflection point of approximately 1.1 MPa. The SCC susceptibility reaches the maximum when the PCO2 is about 1.1 MPa. The SCC susceptibility has a positive correlation to PH2S and water content. The higher water content of the corrosion medium can increase the electrical conductivity of the corrosion medium and promote the corrosion of L80 steel, which can improve the diffusion of hydrogen into steel and promote the SCC of L80 steel. Preloading stress can promote local corrosion, thereby promoting SCC of steel under stress. The dislocation emergence point caused by preloading stress can accelerate the diffusion of hydrogen into steel and increase SCC susceptibility.

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“…According to Cho et al [46], film grows as a place-exchange mechanism on the bare metal substrate surface, and grows as a high-field model after a monolayer forms. All currents flowing through the anode can be divided into two parts: currents for dissolution and from film formation [47]. In the initial period of repassivation, there is substantial metal substrate dissolution due to the missing protection of the passive film.…”

Section: Effect Of Ph On the Repassivation Behavior Of Ta2mentioning

confidence: 99%

Effect of pH on the Corrosion and Repassivation Behavior of TA2 in Simulated Seawater

et al. 2021

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The effect of pH on the corrosion and repassivation behavior of TA2 in simulated seawater was studied using electrochemical tests, immersion experiments, and surface morphology topology analysis. The results show that Ecorr and Rf increased while ipass and weight loss rate decreased as the pH of simulated seawater increased. The TA2 passive film was determined to be mainly composed of a large amount of TiO2 and a small amount of TiO. The repassivation function of TA2 can be expressed as E = −0.1375 + 0.0532ln(t − 1.241) for a simulated seawater pH of 8.2. The parameter b, which represents the slope of the potential–time curve during the friction electrode test, was used to evaluate the repassivation behavior of TA2. The increase in pH value was observed to promote the repassivation speed of the passive film, which is beneficial to the corrosion resistance of TA2.

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Fundamental investigation of stress corrosion cracking of E690 steel in simulated marine thin electrolyte layer

Cited by 86 publications

References 43 publications

Microenvironment evolution and SCC behavior of subsea pipeline within disbonded coating crevice in a seawater environment under cathodic protection

Microenvironment evolution and SCC behavior of subsea pipeline within disbonded coating crevice in a seawater environment under cathodic protection

Effect of Service Environmental Parameters on Electrochemical Corrosion Behavior of L80 Casing Steel

Effect of pH on the Corrosion and Repassivation Behavior of TA2 in Simulated Seawater

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