Experiment research of dynamic stray current interference on buried gas pipeline from urban rail transit

Chen, Zhiguang; Qin, Chaokui; Tang, Jixu; Zhou, Yu

doi:10.1016/j.jngse.2013.09.003

Cited by 61 publications

(32 citation statements)

References 4 publications

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“…Although cathodic protection (CP) is widely used in corrosion prevention, conditions that are often encountered in practice such as stray currents 1 or CP currents shielding 2,3 could significantly affect its effectiveness. Unfortunately, methods to evaluate corrosion rates under CP are uncommon and seriously limited.…”

mentioning

confidence: 99%

An Electrochemical Method for Measuring Localized Corrosion under Cathodic Protection

Varela

Tan

Forsyth

2014

ECS Electrochemistry Letters

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A new method has been developed to measure metal corrosion rates and their distribution under cathodic protection (CP). This method uses an electrochemically integrated multi-electrode array to take local measurements of cathodic current density while simulating a continuous metallic surface. The distribution of cathodic current densities obtained under CP was analyzed to estimate the anodic current component at each electrode of the array. Corrosion patterns determined by this new method have shown good correlation with visual inspection and surface profilometry of the multi-electrode array surface.

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mentioning

confidence: 99%

An Electrochemical Method for Measuring Localized Corrosion under Cathodic Protection

Varela

Tan

Forsyth

2014

ECS Electrochemistry Letters

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“…ω ih (4,m) ω ih (3,m) ω ih (1,1) ω ih (2,1) ω ih (4,m) ω ih (2,m) ω ih (1,m) ω ih (4,1) ω ih (3,1) ω ho (1,1) ω ho (m,1) ω ho (1,1) ω ho(m,1) ω ih (1,1) Cl% ORP Figure 7: Structure of the ANN and encoding details in QPSO. 8 Complexity function corresponding to the number of hidden nodes.…”

Section: Corrosion Current Density Prediction Andmentioning

confidence: 99%

“…Stray current leakage and its corrosion in the direct current (DC) mass transit system are shown in Figure 1. Stray current will cause electrochemical corrosion in some of the infrastructure, such as the running rails [2], buried pipelines [3], and concrete structures [4,5], which overall reduces the safety performance of the DC mass transit system. In particular, it needs to be explained that most pipelines consist of carbon steel, which makes corrosion one of the most common integrity threats of these systems [6].…”

Section: Introductionmentioning

confidence: 99%

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Prediction Model of Corrosion Current Density Induced by Stray Current Based on QPSO‐Driven Neural Network

Wang

Xin

et al. 2019

Complexity

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The buried pipelines and metallic structures in subway systems are subjected to electrochemical corrosion under the stray current interference. The corrosion current density determines the degree and the speed of stray current corrosion. A method combining electrochemical experiment with the machine learning algorithm was utilized in this research to study the corrosion current density under the coupling action of stray current and chloride ion. In this study, a quantum particle swarm optimization-neural network (QPSO-NN) model was built up to predict the corrosion current density in the process of stray current corrosion. The QPSO algorithm was employed to optimize the updating process of weights and biases in the artificial neural network (ANN). The results show that the accuracy of the proposed QPSO-NN model is better than the model based on backpropagation neural network (BPNN) and particle swarm optimization-neural network (PSO-NN). The accuracy distribution of the QPSO-NN model is more stable than that of the BPNN model and the PSO-NN model. The presented model can be used for the prediction of corrosion current density and provides the possibility to monitor the stray current corrosion in subway system through an intelligent learning algorithm.

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“…These coatings are also severely affected by various long-term corrosion factors in the soil during the life of the pipe and its service, and these factors often cause coating disbonding. Corrosive media, such as soil solutions, infiltrate into the interface between the pipeline and the damaged coating, forming a favorable corrosion microenvironment and corroding the pipeline [1,2]. Stray currents refer to the currents that occur outside of a specific loop.…”

Section: Introductionmentioning

confidence: 99%

Effect of a DC Stray Current on the Corrosion of X80 Pipeline Steel and the Cathodic Disbondment Behavior of the Protective 3PE Coating in 3.5% NaCl Solution

Wang

Chen

et al. 2019

Coatings

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The influence of a direct current (DC) stray current on the corrosion and cathodic disbondment of X80 steel coated with a polyethylene (3PE) coating in 3.5% NaCl solution was studied by immersion experiments, electrochemical tests, three-dimensional microscopy, and a surface analysis. The results showed that the potential of the X80 steel sample shifts under the direct current. After 100A/m 2 DC interference was applied, the potential of the sample in the anode region positively shifted from -0.68 to -0.43 V. At the same time, the sample in the cathode region negatively shifted to -1.45 V. Under the DC anode action, the X80 steel corrosion exhibited no passivation and followed Faraday's law of electrolysis, in which the corrosion rate is proportional to the current density. Three-dimensional (3D) digital microscopy showed that, as the DC current increased, the depth of the corrosion pit also increased (gradually), indicating a higher corrosion degree. The sample in the cathode region only underwent a hydrogen evolution reaction, which caused cathodic disbondment of the coating. The stray current had a critical current density for the coating disbonding: the coating delamination area reached its maximum and then remained unchanged.Coatings 2019, 9, 29 2 of 12 of stray current corrosion on buried metal pipelines in a subway and discussed potential measures to minimize and eliminate the influences of stray current corrosion. Zhu et al. [10] proposed an effective stray current drainage method based on the mechanism of stray current interference to minimize corrosion. Currently, scientists have a good agreement on the mechanism by which DC stray currents cause corrosion, i.e., that it is caused by an electrochemical reaction and the amount of corrosion is proportional to the stray current's density, which follows Faraday's law of electrolysis [11][12][13].The main focus of the research efforts is whether or not the buried pipelines experience DC interference and the resulting corrosive damage. However, cathodic disbondment of the coating due to DC stray currents in the pipeline area is less studied. When a DC current passes through the damaged portion of the coating of buried long-distance pipelines, an anode region forms that causes electrolytic corrosion of the metal pipeline, resulting in a corrosion piercing [14,15]. In contrast, DC passing through the cathode region does not cause stray current corrosion of the pipeline because of the protection by the cathode current. However, if the potential of the cathode area is too negative, a cathodic hydrogen evolution reaction (HER) and an oxygen reduction reaction (ORR) occur on the pipeline's surface, causing cathodic disbondment of the coating [16][17][18]. Nielsen et al. [19], after field investigations and tests, determined that the surface of buried steel pipelines under cathodic protection (CP) generates large amounts of OH − that raise the localized pH around the defect areas, which eventually leads to a pH increase in the majority of the area around the buried p...

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Experiment research of dynamic stray current interference on buried gas pipeline from urban rail transit

Cited by 61 publications

References 4 publications

An Electrochemical Method for Measuring Localized Corrosion under Cathodic Protection

An Electrochemical Method for Measuring Localized Corrosion under Cathodic Protection

Prediction Model of Corrosion Current Density Induced by Stray Current Based on QPSO‐Driven Neural Network

Effect of a DC Stray Current on the Corrosion of X80 Pipeline Steel and the Cathodic Disbondment Behavior of the Protective 3PE Coating in 3.5% NaCl Solution

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