It's easy to test this. Please do so, and then discuss your findings, rather than just repeating assertions that appear to be nothing but trolling. I have seen enormous amounts of steel that has been coated with zinc, a process called galvanization, and so has everybody here.
Never have I noted that steel becoming useless structurally.
This allegation is baseless, almost certainly false, and appears to be intended to poison the well of rational discussion of the terrorism executed by the US government against American civilians to keep them cowed and obedient to profitable quasi-slavery.
You can easily buy pure zinc at any marina, because it is sold to decrease corrosion of other metals, and use it to test whether or not galvanization turns steel into trash. However, just considering the claim logically reveals it's almost certainly nothing but disinformation - a lie - intended to prevent people from considering actual facts.
Repeating it without rational consideration, or better yet, actually testing it, is harmful to folks facing the horrifying prospect of being ruled by despots via terrorism.
Please don't do that.
I am trained to do welding and plasma cutting, but I don't presently own or have access to said equipment. LME was not a topic brought up at the class, as we were just focusing on steel, but it was something I was previously made aware of. If not for bad AI at a staffing agency, I would likely be building battleships.
If I were spend the money for a welder system, the electrodes, and for kevlar based PPE, I don't think you'd watch my experimentation nor do I think it would be worth my time/money. Sure I could build a bloom furnace a lot cheaper than the commercial equipment to just melt a some Zinc onto steel and try to replicate the process of LME, but the ground is still frozen here. Still a waste of my time. Why?, because there are already scientific literature on the subject of Liquid Metal Embrittlement freely available. Including this one from the American Welding society. Read it.
https://app.aws.org/wj/supplement/WJ_1992_12_s455.pdf
Zinc melts @~420 F. You can melt zinc in a frying pan on your stove, all you'll need besides a hunk of zinc is a hunk of steel.
That paper describes a very limited set of circumstances and alloys LME affects, not ordinary steel but austenitic stainless steel. Not one girder in the Twin Towers was made of stainless, so LME didn't contribute at all to the 9/11 demolition.
I can appreciate how the specific details of LME are a bit esoteric, and note you're a welder, not a metallurgist. However, the hypothesis regarding 9/11 isn't supported by the paper you link, and you seem to write well, indicating good intelligence, so I think you should be competent to understand the paper.
That's the only conditions in which LME is produced according to the paper.
I hope your understanding now includes that LME only affects austenitic stainless steel, which does not include the support structure of the Twin Towers.
BTW, don't melt any zinc without a full respirator. The fumes from boiling zinc are extremely toxic. Never, ever weld galvanized steel without a respirator. An ordinary mask won't stop the vapor.
The melting point of Zinc is indeed 420 degrees, but Celsius not Fahrenheit. I am not sure that my stove top can reach those temperatures. You are right about it being toxic, I'll keep that in mind if I leave the country and make gun metal.
The article was from apparently 1992, before the twin tower attack. Of course it wasn't geared towards proving or suggesting the cause of the collapse of the twin towers, but showing that the phenomena of liquid metal embrittlement of molten zinc on steel was already documented and didn't need my repeating. You chose to focus too far into one specific example, instead of as general concept.
A36 steel is one of the types of steel that was used in the world trade center. Galvenized steel can include A36 steel like seen in the above article, but galvanization makes structural steel weaker. There are standards that try to minimize LME during the galvanization process but it can still occur. Supposing that sufficient molton zinc (or even lead, or some other metals) came into contact during the impact then the fuel combustion would make the temperatures by ripe for the LME but there would be substantial additional stress if not from the impact then from the structure itself enhancing LME potential.
http://rwlab.sjtu.edu.cn/tiwm/papers/V1N3-2.pdf
I should have immediately pointed out that I am not a metallurgist, and have no specific expertise based on experience. What is in the papers you are providing is my source on these issues, except for my lifelong experience with galvanized pipe, which isn't very brittle as a rule.
I very much appreciate your pointing out the noob error of confusing Celsius with Fahrenheit.
The steel in the Twin Towers was not galvanized. Even if the planes were made of solid zinc, they would not have so embrittled the towers as to cause collapse, because almost all of the heat from the explosions of the fuel was expended in less than one minute. There was no zinc to embrittle the steel,and the towers didn't collapse immediately, but only after significant time had passed, revealing that sudden embrittlement did not contribute to the collapse.
Absent thermite and thermate, and intentional demolition, the towers would not have collapsed. LME was not a significant factor in that demolition. In this last paper you have provided, steels beyond stainless are revealed to potentially be subject to LME. Regardless, unless you propose some mechanism by which the planes coated the internal structures of the towers in liquid zinc, and caused it to penetrate deeply into the 24" thick supporting members, LME could have played no part in the demolition of the towers on 9/11.
LME is a highly localized phenomenon, and restricted to the surface of even sheet steel used throughout this paper. Such surficial effects would have had almost no effect on beams 24" thick.