this post was submitted on 12 Jan 2024
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[–] XeroxCool 48 points 1 year ago* (last edited 1 year ago) (1 children)

A process that normally lowers the corrosion resistance had the opposite effect when applied over an alternate known-good option. Chromium passivation is the known-good, manganese passivation is known to make it worse. Manganese-passivating chromium-passivated stainless looks like it's way more corrosion resistant than either passivation on its own and non-passivated stainless

Also, daily reminder, stainless steel corrodes. It forms a corrosion layer that is hard and doesn't change size compared to the base metal (unlike rust on normal steel, which expands), but it can still be prone to erosion particularly in oxygen-depleted water. Even 316.

[–] NoSpotOfGround 1 points 1 year ago (1 children)

I'm kinda glad stainless steel corrodes in the end. Else it would become a micro-fragment polluter like plastic.

[–] XeroxCool 4 points 1 year ago

I'd say a major difference is that steel is an alloy of natural inorganic elements. The components aren't especially toxic, at least not any more than how they already exist in the environment. Microplastics are entirely man made and don't have any natural, decent way to be broken down organically. Would you count sand as a pollutant? It'll last way longer than plastic and we certainly ship it around everywhere. Eating sand is just part of marine life

[–] [email protected] 21 points 1 year ago (3 children)

How are the other properties? Will this stuff appear in knives? Hardness, edge retention, brittle... ness-ity?

Will this change my life, or is it just a curiosity to amuse material scientists?

[–] Langehund 45 points 1 year ago (1 children)

This steels intended design use is hydrogen production through the electrolysis of salt water. Typically it is done with titanium because existing stainless steels corrode too much in the high chloride environment. But this novel process of adding corrosion resistance steel performs just as well as the titanium. It’s not a knife steel. As with most material science materials, this was designed for a specific use case in mind. Not all steels have to be good at everything. A knife super steel would probably be bad at hydrogen production for example.

[–] [email protected] 10 points 1 year ago

Thanks!

True, steels are very specific, even within knife applications. For instance, there are certain steels used for knives for marine environments; they're not usually used outside of those specialty knives because they give up other desireable characteristics for the corrosion resistance.

Which leads me back to why I asked the question. Corrosion/rust resistance is desireable in knives, and that's what this sounded like. Ah, well... maybe it'll inform the next generation of steels.

[–] [email protected] 2 points 1 year ago* (last edited 1 year ago)

The way i read it is its another big step in the development of nanocomposites/meta materials.

You can sort of explain it by hand carving materials on a molecular level so they exibit all kinds of possibly exitic effects. Like deforming light or to kill certain germs.

Its one of my favorite tech to mention because the story of supposed normal looking but atomically weird materials found at ufo crashsites

[–] PlutoniumAcid 2 points 7 months ago (1 children)

brittle... ness-ity?

I love you!

[–] [email protected] 2 points 7 months ago

And I love you, PlutoniumAcid!

[–] [email protected] 18 points 1 year ago (5 children)
[–] [email protected] 15 points 1 year ago (1 children)

Of course I can’t. But they fucking should.

[–] [email protected] 5 points 1 year ago (2 children)

I was making a lame attempt at that Bill O'Reilly joke about magnets or whatever, but you're right, they fucking should!

[–] [email protected] 8 points 1 year ago* (last edited 1 year ago) (2 children)
[–] DogWater 7 points 1 year ago

That's ancient internet wisdom.

Sage posting for real

[–] [email protected] 3 points 1 year ago (1 children)

Some people can, and I do not trust those people.

[–] nodimetotie 2 points 1 year ago

Probably because they reveal that fact to you?

[–] [email protected] 2 points 1 year ago

It wasn't even magnets, it was the tide.

[–] ikidd 5 points 1 year ago (2 children)

And SS isn't magnetic, either.

Explain that, juggalos.

[–] HootinNHollerin 4 points 1 year ago* (last edited 11 months ago)

300 series isn’t but 400 series is mildly magnetic

And that’s my lesson for you juggalos and juggalettes today - skelator.jpg

[–] [email protected] 3 points 1 year ago

Checkmate atheists

[–] Orbituary 3 points 1 year ago (1 children)
[–] [email protected] 3 points 1 year ago (1 children)
[–] [email protected] 1 points 1 year ago

NEATallurgy.

[–] [email protected] 3 points 1 year ago

I certainly can't

[–] [email protected] 1 points 1 year ago* (last edited 1 year ago)

Who put it there?

[–] sagrotan 4 points 1 year ago

New steel? Want knife made from it. Now! Gimme!