What is hydrogen embrittlement and what can be done to prevent it?
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- เผยแพร่เมื่อ 18 ส.ค. 2020
- Having played an acknowledged role in the 2011 Fukushima disaster, it has long been understood that hydrogen penetration can accelerate the deterioration of structural materials. In this video, BAPTISTE GAULT analyzes this process of hydrogen embrittlement and puts forward ideas as to how it can be combated. Focusing on steel in the first instance, Gault employs atom probe tomography to pin down the scale and location of hydrogen penetration. Suggesting that hydrogen’s potential to do damage is related to its atoms’ ability to roam, Gault proposes that particles be introduced to trap them/restrict their movement. The research has undoubted potential application beyond steel, in titanium and nickel alloys as well in the broader realm of hydrogen fuel.
Original publication: www.sciencedirect.com/science...
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finally some solid information as to why a metal chain cleaned with wrong ph cleaner will create cracks.
Thanks for this nice video!
Great video and great nature article
This will become even more important in the future with electricity to hydrogen production and use of hydrogen in fusion power.
Absolutely. We are working on many aspects of hydrogen embrittlement and its prevention through coatings, self-healing and trapping.
Thanks!
What method is toyota doing
Hydrogen embrittlement has a small effect on the dynamic response of iron and steel - rather it's "calling card" is DELAYED fracture.
would be really nice to have more information in the future about this as it will be quite a challenge dealing with this issue if we want to store large quantities of hydrogen safely in the future...
Thanks for your interest. Please have a look here:
Materials under harsh conditions: www.mpie.de/4200660/materials-under-harsh-environments-and-their-stability-of-surfaces-and-interfaces
All about hydrogen: www.mpie.de/4595091/all-about-hydrogen
Hello experts. Could you please compare Nace Technologist and API 571 Certification. Which is better for inspection engineers.
Thanks.
Very interesting video.
So is the presence of hydrogen in the metal the cause of the cracking after welding or, is the cracking of metal caused by hydrogen leaving the metal after it has cooled and therefore trapped too many hydrogen particles in spaces where it cannot remain constrained?
Post heat treatment after welding allows more hydrogen to escape as you know, however, it could be that no pre or post heat treatment leaves the hydrogen particles vulnerable to entrapment in a confined space which they then burst out of in order to escape within the first hour after welding.
Hi Jon
this is a complex issue, but a heat treatment may not enable the "detrapping" of some of the trapped hydrogen - it depends on how deeply it is trapped, ie what is the energy binding the hydrogen to its trapping site, which depends on the trapping site itself (e.g. a grain boundary, a carbide-matrix interface, a dislocation), along with the diffusivity of hydrogen in the surrounding matrix. So in ferritic or martensitic steels, in which hydrogen diffusion goes fast, detrapping could work efficiently, but in austenitic steels not so much... it might mean that even if we provide sufficient thermal agitation to move the hydrogen out of its site, it remains more or less close to the trapping site and might even progressively move back there
it is also theorised that hydrogen may be more deleterious when free to move through a microstructure as it can facilitate the movement of dislocations, ie accelerate the deformation. Yet at some interfaces, when it agglemerates, it can facilitate their decohesion and cause embrittlement... our colleague Huan discusses this here: th-cam.com/video/oMpdMyLTMC0/w-d-xo.html
I hope this answers your question :)
MRT ndt inspection technology is applied to pipe hydrogen embrittlement inspection,
cracks, hardness, thickness, structural defects, health monitoring.
MRT is an advanced technology
from ECT. This is the principle of ECT that uses a coil to generate a magnetic field. MRT is the electromagnetic wave technology. MRT detects naturally occurring defects, welding defects, pit, line on the
inner and outer surfaces of pipes regardless of size during processing.
Advanced Magnetic Resonance Testing solutions for Battery manufacturers
Raynar MRT can monitoring the welding condition of aluminum terminals welded to copper plates. MRT Welding Inspection Solutions Distinguish between normal and bad welding of aluminum and copper plates. On the surface, eddy currents are generated at high frequencies and gradually lower frequencies are applied to monitor the condition of the junction to determine the bond strength.
What are methods to overcome Hydrogen embrittlement in Steels ?
Dear Sandip,
we are currently preparing a video on this topic. Meanwhile, the short answer is: coating or trapping. Please have a look here:
www.mpie.de/4580549/dead-ends-for-hydrogen-induced-cracks?c=2914286
www.mpie.de/4339224/hydrogen-h2bs?c=2914286
Is it not possible to coat metal parts with some coating material (e.g. graphene)?
Yes, it is in principle possible to use coatings but coatings do often involve other problems. E.g. when you galvanize, the metal you deposit can embrittle the metal underneath and cause different problems. Additionally, a coating typically slows processes down. Please have a look here on our research about coatings and intelligent self-healing mechanisms:
www.mpie.de/corrosion
If you have further questions, just drop a line.
Wonder if it can be contained by magnetics
what do you mean? contain what? magnetics would only work for charged particles...?
@@baptistegault6336 well, plasma doors exist don't they?
@@NwoDispatcher no?
Can I recommend a class on basic physics and chemistry
Thank you so much for this brief lesson,well done , may you please give me your professional address?
Please have a look at our website: www.mpie.de/2281/en
How does H2 disassociate to atomic H, without a galvanic reaction?
yes, H2 on the surface of many metals may be more stable as a split molecule and hence as atomic hydrogen
@@mpisusmat are you saying that H2 disassociates into atomic H spontaneously at an Fe surface? One would think this is p and T dependent. Can you please refer to literature?
@@oeneroorda2699 Dear Oene, thank you for your interest. Usually hydrogen adsorbs in a dissociated state on metal surfaces. Please have a look at this paper:
www.sciencedirect.com/science/article/pii/016757298890009X
@@mpisusmat thank you, I will read the article with great interest. Did you mean to say that there is also a mechanism by which molecular hydrogen is absorbed at the metal surface, without prior dissociation?
Heloden 😂
Thanks!