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Tesla's Cybertruck may not be so stainless after all (www.theregister.com)

submitted 9 months ago by L4s@lemmy.world to c/technology@lemmy.world

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Tesla's Cybertruck may not be so stainless after all::'Literally bulletproof' but needs constant cleaning to stave off corrosion

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[–] n3m37h@sh.itjust.works 7 points 9 months ago (3 children)

Real stainless steel does not rust. I brew beer and daily soak down my stainless steel sink/kettles daily. Even harsh chemicals (muritiac acid, chlorinated caustic soda) don't affect it.

[–] carzian@lemmy.ml 35 points 9 months ago* (last edited 9 months ago) (1 children)

Theres no such thing as "real stainless". Stainless steel 304 is corrosion resistant, it's the cheapest and most common. 316 is better at corrosion resistance and is "marine grade" since it will hold up better to salt water. 316L is some of the best at resisting corrosion, it's more expensive than 304 and is used in lab and surgical equipment. There are a lot of other types, like 309 for higher heat applications, etc.

Cybertruck is probably made from 304.

Definately not supprised that cybertrucks are having this issue. Especially with road salt in the winter. I'm sure the engineers at Tesla saw this coming too.

[–] RubberElectrons@lemmy.world 4 points 9 months ago

Not the cheapest, there's 17-4 and 18-8 before 304.

[–] yojimbo@sopuli.xyz 13 points 9 months ago

I am not an expert - just an avid knife freak - but in my experience "Stainless" means "Stain Less" not "Stain Resistent". Eg. s35vn is relatively high quality stainless knife steel - that does not mean it ain't gonna pickup stains - all mine did... I suspect one of the differences between my knifes / Elons Cybertruck vs. your cookware is that your cookware is mirror polished while my knives and the cybertruck are sporting "satin finish" which looks quite esthetically first 5 mnts - but is quite inpractical...

[–] Siegfried@lemmy.world 5 points 9 months ago

What makes stainless steel stainless is that it corrodes quickly, uniformly and forms a dense rich en Cr carbide coating (I dont know how it is called in english). This reduces the rate at which it corrodes enormously. This is the same on most "corrosion resistant" metals and alloys, like aluminium, titanium and zirconium.

There are multiple grades of SS, some of them are better at halting corrosion than others. And given the right environment (chemical + temperature) it will ultimately corrode.

Some geometrical obstacles* can produce other, more localized, types of corrosion... again, sorry, I dont know the technical words in english.