Electrochemical corrosion behaviors of the X90 linepipe steel in NS4 solution

Luo, Jun; Zhang, Liang; Li, Lifeng; Yang, Fengping; Ma, Wanbiao; Wang, Ke; Zhao, Xinwei

doi:10.1016/j.ngib.2016.12.011

Cited by 16 publications

(2 citation statements)

References 8 publications

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“…The polarization resistance (R p ) is used to investigate the dynamics in the electrochemical corrosion process. 48 It reveals that WM is more resistant to corrosion than BM and HAZ (refer Figure 8(b)). And it corresponds to the results measured from the polarization curves.…”

Section: Resultsmentioning

confidence: 91%

Studies on corrosion behavior of AISI 316L cold metal transfer weldments in physiological solutions

Kannan

Shanmugam

Sreedhar

2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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Evaluating the mechanical integrity and corrosion performance of welded joints is vital to replace the malfunctioning parts in human body. This research aims to study the effect of Cold Metal Transfer (CMT) process on the corrosion behavior of austenitic stainless steel (AISI 316L) weldments in physiological solution. ER316L filler wire is used to weld thin sheets of 2mm to butt joint configuration. Optical microscopy and Scanning electron microscopy (SEM) are used to study the microstructural evolution in base metal (BM), heat affected zone (HAZ) and weld metal (WM). For determining the phases in BM and WM, X-ray diffraction (XRD) spectrums are captured. WM microstructure illustrated the presence of equiaxed grains while columnar dendrites were observed at HAZ. Energy Dispersive X-Ray Spectroscopy (EDS) analysis highlighted the increase in wt. % of Fe and Cr in WM due to the thermal variations. EDS elemental mapping revealed uniform distribution of Cr, Mo and Fe elements in the WM. AISI 316L WM exhibited higher tensile strength and reduced ductility compared to BM. Micro-hardness measurements showed higher hardness at the WM as result of the increased ferrite content and ductile mode of fracture was characterized with dimples and micro voids. During Corrosion test, the WM and the BM revealed lower corrosion potential and the pitting tendency is relatively less than HAZ. The delta ferrite (δ) formation in the HAZ and WM did not affect the corrosion behavior significantly as confirmed from Tafel scans and Nyquist plots. The corrosion rate is within the acceptable range, ie. First level for WM (<1 mpy) and second level for BM and HAZ (1-5 mpy), respectively.

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Section: Resultsmentioning

confidence: 91%

Studies on corrosion behavior of AISI 316L cold metal transfer weldments in physiological solutions

Kannan

Shanmugam

Sreedhar

2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…In NaOH solution, the pipeline steel demonstrates passivity with a passive current density of 10 -6 A/cm 2 , whereas in NACE and NS4 solutions this pipeline steel does not passivate. Luo et al [14] studied the electrochemical behavior of X90 pipeline steel in NS4 solution and found a typical characteristic of anodic dissolution with no passivation phenomenon in NS4 solution. They found that the polarization resistance and the corrosion resistance increase when proceeding of the polarization time, while the corrosion current density decreases.…”

Section: Potentiodynamic Studymentioning

confidence: 99%

Study of Electrochemical Behavior, Hydrogen Permeation and Diffusion in Pipeline Steel

Dey

Sivaprasad

Das³

et al. 2021

MSF

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The pipeline steels which are used for transportation of natural gas and crude oil suffer from hydrogen damage at their internal as well as external surfaces. The internal surfaces of pipelines are generally affected due to hydrogen induced cracking and the external surfaces due to the soil environmental conditions which cause stress corrosion cracking. In the present investigation, the electrochemical corrosion behavior of X70 pipeline steel was studied in sour environment and near neutral soil environment. To assess the mechanism of hydrogen damage in steel, electrochemical hydrogen charging and permeation techniques were used to characterize the hydrogen distribution, trapping and its diffusion in X70 pipeline steel. It has been found that corrosion behavior of pipeline steel in the sour environment is higher than the near neutral soil solution. From the hydrogen permeation study it is established that the hydrogen permeation rate increases with the square root of the charging current density, and the increase of hydrogen flux is directly proportional to the subsurface hydrogen concentration.

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Preliminary Evaluation of the Influence of Hydrogen on the Fracture Toughness of an X65 Gas‐Transmission Pipeline Steel

Chowdhury,

Tapia‐Bastidas,

Hoschke

et al. 2024

Adv Eng Mater

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Previous research has indicated that hydrogen decreases the fracture toughness of gas transmission pipeline steels. This study produced two values of fracture toughness for the X65 steel in the Dampier Bunbury Natural Gas pipeline in air (JQ of 590 and 778 kJ/m2; equivalent to KQ of 369 MPa and 487 MPa) and two essentially ASTM‐valid values of fracture toughness of KJ1C of 150 MPa and 189 MPa for X65 subjected to in‐situ hydrogen charging thought to be equivalent to a hydrogen gas pressure of 200 bar. The fracture toughness for hydrogen‐charged specimens was lower than in air. The large spread of the fracture toughness in air was attributable to the fact that these JQ values were dependent on testing details. The spread of fracture toughness values in hydrogen was attributed to the variability of fracture toughness in hydrogen under these hydrogen charging conditions. There was considerable stable crack growth. The energy for stable crack growth increased with crack length. The fractography in the presence of hydrogen showed significant ductility, consistent with hydrogen assisted plastic fracture. The values of fracture toughness in air and with hydrogen were consistent with literature values.This article is protected by copyright. All rights reserved.

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Electrochemical corrosion behaviors of the X90 linepipe steel in NS4 solution

Cited by 16 publications

References 8 publications

Studies on corrosion behavior of AISI 316L cold metal transfer weldments in physiological solutions

Studies on corrosion behavior of AISI 316L cold metal transfer weldments in physiological solutions

Study of Electrochemical Behavior, Hydrogen Permeation and Diffusion in Pipeline Steel

Preliminary Evaluation of the Influence of Hydrogen on the Fracture Toughness of an X65 Gas‐Transmission Pipeline Steel

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