Investigation of hydrogen concentration and hydrogen damage on API X80 steel surface under cathodic overprotection
- Resource Type
- Authors
- Wenhai Cao; Lei Zhang; Kuangda Lu; Hongjie Shen; Yanni Sun; Fang Yichen; Yunying Xing; Minxu Lu; Yanxia Du
- Source
- International Journal of Hydrogen Energy. 42:29888-29896
- Subject
- Materials science
Hydrogen
Hydrogen damage
Scanning electron microscope
020209 energy
Thermal desorption
Energy Engineering and Power Technology
chemistry.chemical_element
02 engineering and technology
law.invention
Cathodic protection
Optical microscope
law
0202 electrical engineering, electronic engineering, information engineering
medicine
Composite material
Renewable Energy, Sustainability and the Environment
Metallurgy
Blisters
021001 nanoscience & nanotechnology
Condensed Matter Physics
Fuel Technology
chemistry
medicine.symptom
0210 nano-technology
Hydrogen embrittlement
- Language
- ISSN
- 0360-3199
During the application of the API X80 grade pipeline steel in long distance gas transportation, the risk of hydrogen induced degradation for this kind of high strength material needs to be clarified from a safety point of view. Commercial X80 steel samples were hydrogen charged electrochemically at different current densities and immersion time. Hydrogen damage in the form of blisters and cracks was observed by optical microscope and scanning electron microscopy. Average hydrogen content in the sample measured by thermal desorption method and the sub-surface concentration of diffusible hydrogen detected by hydrogen permeation cell were both employed to indicate the correlation between hydrogen and surface damage. The influence of hydrogen on the mechanical properties of X80 steel was also characterized by slow strain rate tests. The results showed that the hydrogen damage can be detected on the steel surface if the hydrogen content could reach a certain threshold value during the process of rapid hydrogen uptake. It is suggested that there exists a critical hydrogen level before blisters initiate on X80 steel and that the level is 2–3 ppm, under the test conditions used in this work.