Electrochemical characteristic and stress corrosion behavior of API X70 high-strength pipeline steel under a simulated disbonded coating in an artificial seawater environment

2019 ◽  
Vol 845 ◽  
pp. 92-105 ◽  
Author(s):  
Wei Wu ◽  
Zhiyong Liu ◽  
Xiaogang Li ◽  
Cuiwei Du
Keyword(s):  
Stress Corrosion ◽  
Corrosion Behavior ◽  
Pipeline Steel ◽  
High Strength ◽  
Artificial Seawater ◽  
Electrochemical Characteristic ◽  
Seawater Environment ◽  
Disbonded Coating

STRESS CORROSION CRACK INITIATION BEHAVIOR FOR THE X70 PIPELINE STEEL BENEATH A DISBONDED COATING

2012 ◽  
Vol 48 (10) ◽  
pp. 1267 ◽  
Author(s):  
Zhiying WANG ◽  
Jianqiu WANG ◽  
En-hou HAN ◽  
Wei KE ◽  
Maocheng YAN ◽  
...  
Keyword(s):  
Crack Initiation ◽  
Stress Corrosion ◽  
Stress Corrosion Crack ◽  
Pipeline Steel ◽  
X70 Pipeline Steel ◽  
Disbonded Coating

scholarly journals Influence of the ultrasonic surface rolling process on stress corrosion cracking susceptibility of high strength pipeline steel in neutral pH environment

RSC Advances ◽  
2017 ◽  
Vol 7 (59) ◽  
pp. 36876-36885 ◽  
Author(s):  
Bingying Wang ◽  
Yu Yin ◽  
Zhiwei Gao ◽  
Zhenbo Hou ◽  
Wenchun Jiang
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Pipeline Steel ◽  
High Strength ◽  
Rolling Process ◽  
Corrosion Cracking ◽  
X80 Pipeline Steel ◽  
Enhancement Technique ◽  
Neutral Ph ◽  
Developed Surface

A developed surface enhancement technique, USRP, was applied on X80 pipeline steel and the stress corrosion cracking susceptibility was studied.

A Three-Dimensional Coupled Finite Element Model for the Simulation of Stress Corrosion on Pipeline Steel

2019 ◽  
Author(s):  
Dongxu Sun ◽  
Ming Wu ◽  
Fei Xie ◽  
Ke Gong
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Stress Corrosion ◽  
Corrosion Behavior ◽  
Pipeline Steel ◽  
Three Dimensional ◽  
Element Model ◽  
Circumferential Direction ◽  
The Self ◽  
Corrosion Defect

Abstract In this study, a three-dimensional finite element model was constructed to study the stress corrosion behavior of pipeline steel. Stress analysis and electrochemical calculation were incorporated into the model through multiphysics field coupling technique. Tensile property and electrochemical corrosion behavior of X70 pipeline steel were measured by experiments to formulate the model. The modeling results show that the corrosion is accelerated on the surface of corrosion defect where the stress tends to concentrate because of mechanoelectrochemical effect. The effect of elastic strain on corrosion enhancement is not obvious. The plastic deformation on defect bottom increases the corrosion rate significantly, especially for the conditions with high operating pressure or large defect depth. The corrosion current distribution indicated that the “self-acceleration effect” exists on corrosion defect. This effect makes the corrosion develop to depth and the shape of corrosion defects is more likely to cause stress concentration, and finally induces corrosion perforation or cracking. The two directions, i.e. axial and circumferential direction, have the different stress corrosion behaviors. The “self-acceleration effect” is more obvious on circumferential direction than that on axial direction, which can explain the phenomenon that there are mostly axial stress corrosion cracks on the pipeline in field.

Stress corrosion of pipeline steel under disbonded coating in a SRB-containing environment

2019 ◽  
Vol 157 ◽  
pp. 518-530 ◽  
Author(s):  
Tangqing Wu ◽  
Maocheng Yan ◽  
Libao Yu ◽  
Hongtao Zhao ◽  
Cheng Sun ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Pipeline Steel ◽  
Disbonded Coating

Mechanical Properties and CO2 Corrosion Behavior of High Strength and Toughness X80 Pipeline Steel

2014 ◽  
Vol 1010-1012 ◽  
pp. 1709-1712
Author(s):  
Li Dong Wang ◽  
Feng Lei Liu ◽  
Hui Bin Wu
Keyword(s):  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Acicular Ferrite ◽  
Pipeline Steel ◽  
High Strength ◽  
Strengthening Mechanism ◽  
Granular Bainite ◽  
X80 Pipeline Steel ◽  
Better Than ◽  
Strength And Toughness

A type of X80 grade high strength and toughness pipeline steel was designed and researched. The strengthening mechanism of the steel was analyzed by SEM, TEM and XRD, and the CO2corrosion behavior of the steel was simulated by high-temperature and high-pressure autoclave. The result shows that the microstructure of the base metal is mainly acicular ferrite with a small amount of granular bainite. Acicular ferrite consists of laths which occlude and interweave with each other, and there are many dislocation and carbonitrides distributing in acicular ferrite, which made the pipeline steel have good strength and toughness. Under the simulation of the actual working conditions, the activity of reactants is low at 30°C, so the corrosion rate is smaller at this temperature; the maximum of corrosion rate occurs at 60°C; when the temperature increases to 90°C, the corrosion rate is lower than that of 60°C, that is because hindering corrosion effect which take by the acceleration deposit of corrosion product is better than the acceleration corrosion reactions.

Monitoring of Coating Disbondment by a Scanning Kelvin Probe Technique

2010 ◽  
Author(s):  
A. Q. Fu ◽  
Y. F. Cheng
Keyword(s):  
Corrosion Behavior ◽  
Immersion Time ◽  
Pipeline Steel ◽  
Oxygen Solubility ◽  
Kelvin Probe ◽  
Scanning Kelvin Probe ◽  
Corrosion Reaction ◽  
Solution Layer ◽  
Concentrated Solution ◽  
Disbonded Coating

The coating disbondment and corrosion of a X65 pipeline steel under coating were studied by scanning Kelvin probe (SKP) measurements. The effects of immersion time and wet-dry cycle on the Kelvin potential profile and the corrosion behavior of the steel were investigated. Kelvin potential measured on “intact” area is shifted negatively with time, indicating an increasing water uptake under the “intact” coating. There is a more negative Kelvin potential on disbonded area than that on “intact” area, which is attributed to corrosion reaction of steel occurring under the disbonded coating. During wet-dry cycle, the thickness of solution layer trapped under disbonded coating decreases due to evaporation of water, causing a negative shift of Kelvin potential. It is associated with the reduction of oxygen solubility in the concentrated solution during drying of electrolyte.

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

2016 ◽  
Vol 110 ◽  
pp. 23-34 ◽  
Author(s):  
Y.A.N. Maocheng ◽  
X.U. Jin ◽  
Y.U. Libao ◽  
W.U. Tangqing ◽  
S.U.N. Cheng ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Pipeline Steel ◽  
Corrosion Initiation ◽  
Neutral Ph ◽  
Disbonded Coating ◽  
Eis Analysis

Stress corrosion cracking initiation under the disbonded coating of pipeline steel in near-neutral pH environment

2010 ◽  
Vol 52 (11) ◽  
pp. 3750-3756 ◽  
Author(s):  
A. Eslami ◽  
B. Fang ◽  
R. Kania ◽  
B. Worthingham ◽  
J. Been ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Pipeline Steel ◽  
Corrosion Cracking ◽  
Neutral Ph ◽  
Disbonded Coating
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