This will become even more important in the future with electricity to hydrogen production and use of hydrogen in fusion power.
@mpisusmat Жыл бұрын
Absolutely. We are working on many aspects of hydrogen embrittlement and its prevention through coatings, self-healing and trapping.
@ChadCynical3 жыл бұрын
Great video and great nature article
@yazidmadi10793 жыл бұрын
Thanks for this nice video!
@Maelstr0m2 жыл бұрын
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...
@mpisusmat2 жыл бұрын
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
@mushtaqahmed73583 жыл бұрын
Hello experts. Could you please compare Nace Technologist and API 571 Certification. Which is better for inspection engineers. Thanks.
@JonDingle Жыл бұрын
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.
@baptistegault6336 Жыл бұрын
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: kzbin.info/www/bejne/pX7TlYCvgbmAeZI I hope this answers your question :)
@ROLFCOPTERZZ7 ай бұрын
What method is toyota doing
@matiasledezma79624 жыл бұрын
Thanks!
@toniferic-tech87333 жыл бұрын
Is it not possible to coat metal parts with some coating material (e.g. graphene)?
@mpisusmat3 жыл бұрын
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.
@oeneroorda26992 жыл бұрын
How does H2 disassociate to atomic H, without a galvanic reaction?
@mpisusmat2 жыл бұрын
yes, H2 on the surface of many metals may be more stable as a split molecule and hence as atomic hydrogen
@oeneroorda26992 жыл бұрын
@@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?
@mpisusmat2 жыл бұрын
@@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
@oeneroorda26992 жыл бұрын
@@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?
@slaykpop182 жыл бұрын
What are methods to overcome Hydrogen embrittlement in Steels ?
@mpisusmat2 жыл бұрын
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
@EddieVBlueIsland9 ай бұрын
Hydrogen embrittlement has a small effect on the dynamic response of iron and steel - rather it's "calling card" is DELAYED fracture.
@raynardongmansuh4131 Жыл бұрын
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.
@YaBoiNicho4 ай бұрын
LENR processes use this to their advantage
@NwoDispatcher3 жыл бұрын
Wonder if it can be contained by magnetics
@baptistegault63363 жыл бұрын
what do you mean? contain what? magnetics would only work for charged particles...?