Transient numerical model for crevice corrosion of pipelines under disbonded coating with cathodic protection

Chen, X.; Gao, Fengjiao; Wang, Yanliang; He, Chuan

doi:10.1016/j.matdes.2015.09.047

Cited by 30 publications

(10 citation statements)

References 30 publications

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“…The size of the samples was 20 mm × 30 mm × 2 mm with a 10-mmdiameter hole in the center. The samples were ground using 180-, 600-and 1000-grit abrasive papers, cleaned in deionized water and ethanol and dried at 60 °C for 24 h before the experiments [20,21]. A conducting wire was spot welded to the 316L plate to hold the crevice assembly in the test solution and to provide an electrical contact during the test.…”

Section: Methodsmentioning

confidence: 99%

Crevice Corrosion Behaviors Between CFRP and Stainless Steel 316L for Automotive Applications

Sun

Wang

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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Carbon fiber reinforced plastics (CFRP) are promising lightweight materials for vehicle applications. 316L is one of the most widely used types of austenite stainless steels and applied in lots of automotive applications. The existence of crevices will result in galvanic corrosion and crevice corrosion when CFRPs and 316L are directly connected. A crevice former for the galvanic system was therefore designed and applied to evaluate the crevice corrosion behaviors and study the mechanism of galvanic crevice corrosion through several electrochemical techniques in this research. The results showed that the crevice corrosion of galvanic systems grew from crevice mouth to the inside crevice and could be divided into four steps, metastable pitting corrosion at the crevice mouth, initiating step of crevice corrosion, propagating step and ending step of crevice corrosion. Because of the influences of the galvanic system, electrode reaction rates were speeded up and the passivation region was shortened at the initiating stage of crevice corrosion. Corrosion rate was observed to be higher in the galvanic system than that in normal crevice systems.

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Section: Methodsmentioning

confidence: 99%

Crevice Corrosion Behaviors Between CFRP and Stainless Steel 316L for Automotive Applications

Sun

Wang

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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show abstract

“…In situ electrochemical characteristic within the crevice was further elucidated by Wu et al (2019a) with a conventional rectangular crevice system. At the same time, the influence of cathodic potential and microorganism on the corrosion process of steels under disbonded coating was investigated by Chen et al (2016, 2009, 2015). The stress corrosion initiation of pipeline steels under the disbonded coating in simulated soil solution was surveyed by Yan et al (2016, 2015) and Wu et al (2019b), and the results displayed that pitting corrosion clearly appeared on the samples under stress, which promoted the process of SCC initiation.…”

Section: Introductionmentioning

confidence: 99%

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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“…Crevice corrosion is a typical type of localized corrosion during the service of pipeline steels in soil environments. Most studies have focused on the crevice corrosion behavior of pipeline steels under cathodic polarization (Chen et al, 2015(Chen et al, , 2016Du et al, 2008;Wang et al, 2014Wang et al, , 2016. The corrosion of pipelines in soil environments under natural conditions should be investigated (Liu and Cheng, 2017;Zeng et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

In situ study on the influence of bicarbonate, chloride and outer electrode potential on crevice corrosion occurrence and development of X70 steel

Liu

et al. 2019

ACMM

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Purpose The purpose of this paper is to clarify the influence of bicarbonate, chloride and outer electrode potential on crevice corrosion occurrence and development of X70 steel. Design/methodology/approach The crevice corrosion behavior in NaHCO3 and NaCl solutions was investigated through modeling and experiments. The electrode potential and current density distribution were simulated, and the acidification of crevice solution was monitored in situ. Findings The bicarbonate concentration and outer electrode potential remarkably influenced the occurrence of crevice corrosion. The former changes the passivation curves, and the latter alters the initial potential. Moreover, chloride concentration exerted minimal influence. The location of acidification and pitting occurrences depended on the potential difference between the outer electrode and electrode at the active dissolution current peak. Originality/value This study provides a better understanding of the crevice corrosion behavior and mechanism under natural conditions.

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Transient numerical model for crevice corrosion of pipelines under disbonded coating with cathodic protection

Cited by 30 publications

References 30 publications

Crevice Corrosion Behaviors Between CFRP and Stainless Steel 316L for Automotive Applications

Crevice Corrosion Behaviors Between CFRP and Stainless Steel 316L for Automotive Applications

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

In situ study on the influence of bicarbonate, chloride and outer electrode potential on crevice corrosion occurrence and development of X70 steel

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