Electrochemical Corrosion Behaviour of X70 Steel under the Action of Capillary Water in Saline Soils

Wei, Jianjian; He, Bin; Feng, Yongxiang; Hou, Lifeng; Han, Pengju; Bai, Xiao-Bo

doi:10.3390/ma15103426

Cited by 3 publications

(2 citation statements)

References 64 publications

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“…Many studies have been developed in recent years [3][4][5][6][7][8][9][10][11][12] with the aim of finding adequate anti-corrosion protection solutions in order to limit or remove them. Chemical composition is key to understanding how a soil can influence corrosion.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion of API 5L X60 Pipeline Steel in Soil and Surface Defects Detection by Ultrasonic Analysis

Benkhedda,

Bensaid,

Benmoussat

et al. 2024

Metals

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The corrosion steels phenomenon is one of the main problems in the oil industry, such as in buried transmission pipelines used for high gas pressure for long distances. Steels are protected from the external soil corrosion through a bituminous coating, whose action is coupled with a cathodic protection system, which aims to maintain steel in its protection field and thus to avoid any corrosion risk. However, steels in service may experience external surface defects like corrosion pitting and cracking due to electrochemical or mechanical interactions of bare steel with an aggressive soil solution after steel protection failure. These are concerning phenomena and are the major threats of the pipeline transmission system’s reliability and ecological safety. Corrosion mechanisms are varied and can be evaluated by different methods, such as electrochemical measurements, which are influenced by various factors like temperature, pH, soil characteristics, resistivity, water content, and as well mechanical stresses. Corrosion results from simulated artificial soil solutions showed that steel is sensitive to corrosion by soil. Surface defects detection was carried out using an ultrasonic non-destructive method such as C-Scan Emission testing and the time of flight diffraction technique (TOFD) ultrasonic non-contact testing method. After propagation of the ultrasonic waves, the diffracted ultrasonic reflected wave occurring at the edges of the defects appears due to the presence of a corrosion defect by generating defect echoes. The C-Scan ultrasonic image shows surface reflection, including corrosion defects on interfaces with varying acoustic impedances. The cross-transverse speed ultrasonic propagation through the plate including defect is modified, revealing more surface defects, and cross-transverse speed is shown to increase ultrasonic detection presents some advantages, such as precision and speed of detection without alteration to the structure. This method can be used in the industrial context as an intelligent industrial robotics technique.

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Section: Introductionmentioning

confidence: 99%

“…In [8], the electrochemical corrosion behavior of X70 pipeline steel in saline soil under capillary saline water was simulated to study the migration mechanism of saline solution on steel corrosion. The clay-silty loam type soil was taken near the buried gas pipelines.…”

Section: Introductionmentioning

confidence: 99%

Corrosion of API 5L X60 Pipeline Steel in Soil and Surface Defects Detection by Ultrasonic Analysis

Benkhedda,

Bensaid,

Benmoussat

et al. 2024

Metals

View full text Add to dashboard Cite

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Effect of Capillary Action on Short Term Electrochemical Corrosion Behaviour of X70 Steel in Unsaturated Saline Soil

Wei¹

2022

International Journal of Electrochemical Science

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In this study, electrochemical impedance spectroscopy (EIS) was used to analyse the short-term corrosion of X70 steel in four soil corrosion systems with different NaCl content affected by capillary water. The results showed that the short-term electrochemical corrosion behaviour of X70 steel in saline soil was significantly affected by capillary water. In a soil corrosion system with NaCl content of less than or equal to 1.0%, the polarization resistance RP of X70 steel at position 1# was generally less than that at position 2#, and the corrosion rate of X70 steel at position 1# was greater. SEM results showed that the degree of corrosion pit ulcer on the surface of X70 steel at position 1# was generally greater than that at position 2# in the soil with a NaCl content less than or equal to 1.0%. In addition, the equivalent circuits of X70 steel at positions 1#, 2# were Rs(C1R1(WRctQ)) and Rs(WRctQ), respectively, by fitting the EIS results. The impact of the capillary water upturn on the corrosion of X70 steel was further determined by analysing the equivalent circuit parameters and EDS results.

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Effect of Capillary Water on Electrochemical Corrosion Behaviour and Mechanism of X70 Steel in Silty Clay

Wei¹

2022

International Journal of Electrochemical Science

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Electrochemical Corrosion Behaviour of X70 Steel under the Action of Capillary Water in Saline Soils

Cited by 3 publications

References 64 publications

Corrosion of API 5L X60 Pipeline Steel in Soil and Surface Defects Detection by Ultrasonic Analysis

Corrosion of API 5L X60 Pipeline Steel in Soil and Surface Defects Detection by Ultrasonic Analysis

Effect of Capillary Action on Short Term Electrochemical Corrosion Behaviour of X70 Steel in Unsaturated Saline Soil

Effect of Capillary Water on Electrochemical Corrosion Behaviour and Mechanism of X70 Steel in Silty Clay

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