Effects of Applied Potentials on the Hydrogen-Induced Cracking of Pipeline Steel in Low-Temperature and Low-Dissolved-Oxygen Seawater

CORROSION ◽  
10.5006/0521 ◽  
2012 ◽  
Vol 68 (8) ◽  
pp. 713-719 ◽  
Author(s):  
L. Zhang ◽  
M. Du ◽  
Y. Li
Keyword(s):  
Low Temperature ◽  
Hydrogen Embrittlement ◽  
Dissolved Oxygen ◽  
Cleavage Fracture ◽  
Potentiodynamic Polarization ◽  
Hydrogen Permeation ◽  
Pipeline Steel ◽  
Saturated Calomel Electrode ◽  
Low Dissolved Oxygen ◽  
Hydrogen Induced Cracking

The hydrogen-induced cracking of X70 pipeline steel was investigated in low-temperature and low-dissolved-oxygen seawater by means of potentiodynamic polarization, slow strain rate tests (SSRT), and hydrogen permeation measurements. The results showed that the hydrogen evolution potential of X70 steel in low-temperature and low-dissolved-oxygen seawater decreased compared with the normal-temperature seawater. The susceptibility to hydrogen embrittlement increased as the potential shifted in the negative direction. When the polarization potentials were below −1,050 mV vs. saturated calomel electrode (SCE) in low-temperature and low-dissolved-oxygen seawater, the fracture surfaces exhibited quasi-cleavage fracture.

Studies of Hydrogen Embrittlement Effects on Steel Pipeline Used for Natural Gas Transport

2003 ◽  
Author(s):  
Y. Y. Al-Obaid ◽  
Y. F. Al-Obaid
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Natural Gas ◽  
Hydrogen Embrittlement ◽  
Cleavage Fracture ◽  
Gas Transport ◽  
Ferrite Matrix ◽  
Steel Pipeline ◽  
Natural Gas Transport ◽  
Microalloying Elements

A steel pipeline containing niobium, vanadium and titanium as microalloying elements was tested for hydrogen embrittlement. Hydrogenated specimens intercritically annealed at relatively low temperature to develop martensite islands in a ferrite matrix basically exhibited quasi-cleavage fracture with some ductile dimpling. The objective of this investigation, carried out by the principal investigator is to study the mechanical properties and susceptibility to hydrogen embrittlement effects on steel pipeline used for natural gas transport.

Post-Hydrogen Permeation Characterization of V-Based Crystalline Alloy Membranes

2010 ◽  
Vol 654-656 ◽  
pp. 2422-2425
Author(s):  
Guang Sheng Song ◽  
Michael Dolan ◽  
Daniel Liang ◽  
Michael Kellam
Keyword(s):  
Hydrogen Embrittlement ◽  
Surface Characterization ◽  
Hydrogen Permeation ◽  
Surface Preparation ◽  
Fracture Analysis ◽  
Vanadium Alloy ◽  
Practical Application ◽  
Research Challenges ◽  
Hydrogen Induced Cracking

The surface preparation and hydrogen embrittlement in particular are research challenges facing the practical application of vanadium alloy membranes. These two issues are addressed by surface characterization and fracture analysis in order to find the reasons why delamination and crack failures occur during hydrogen permeation. Post-failure analysis of the hydrogen-induced cracking membrane specimen suggests a new failure mechanism for hydrogen embrittlement.

Communications: Responses of Northern, Florida, and Hybrid Largemouth Bass to Low Temperature and Low Dissolved Oxygen

1988 ◽  
Vol 50 (4) ◽  
pp. 225-231 ◽  
Author(s):  
Gary J. Carmichael ◽  
J. Holt Williamson ◽  
Colleen A. Caldwell Woodward ◽  
J. R. Tomasso
Keyword(s):  
Low Temperature ◽  
Dissolved Oxygen ◽  
Largemouth Bass ◽  
Low Dissolved Oxygen
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