273
Tesla Cybertruck May Have A Rust Problem
(www.carsdirect.com)
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
this post was submitted on 13 Feb 2024
273 points (96.0% liked)
Technology
59648 readers
1516 users here now
This is a most excellent place for technology news and articles.
Our Rules
- Follow the lemmy.world rules.
- Only tech related content.
- Be excellent to each another!
- Mod approved content bots can post up to 10 articles per day.
- Threads asking for personal tech support may be deleted.
- Politics threads may be removed.
- No memes allowed as posts, OK to post as comments.
- Only approved bots from the list below, to ask if your bot can be added please contact us.
- Check for duplicates before posting, duplicates may be removed
Approved Bots
founded 1 year ago
MODERATORS
They keep using the words “stainless steel” which is an alloy created to be rustproof by removing the iron out of it. So how exactly is this stainless steel if it rusts?
There are different qualities of stainless steel. Remember kids, it’s stain less not stain never.
I guess there is still iron in it. Looks like they didn’t use an alloy with enough chromium for the application.
Tesla, cutting corners?! Say it isn't so!
Well it has to be workable/formable, weldable and crack resistant under stress. Just welding most stainless mess with its ferrous properties.
Forming it screws it up too. Work hardening after forging can make it magnetic.
In addition to funny is this also actually true?
Yeah. I have a small pocket knife i carry everywhere, it is stainless. I've had it for years, and frequently bring it in the water with me clipped to my swim suit (incase i need to cut a tangled rope). I wash it like a dish with soap and water, i use it hard and put it away wet, and it has been fine for years and years.
After all this, i took it on a single trip in salt water, it spotted with rust that night.
I also have a Sig P938 SAS which has a stainless slide. I keep that dry and oil it on occasion, and yet that one spotted with rust within a year despite me taking good care of it. Luckily sig replaced the slide but this taught me one good lesson.
Different grades of stainless make it different grades of rust resistant. Kind of like calling IP67 electronics, like the iPhone 7, "waterproof" when they can only really withstand splashing. Some can get dunked, some can't.
Absolutely. Why would they call it less if it's actually never? That would be exceptionally terrible marketing.
Sure, “less” means “fewer” or “not as much as”.
But the suffix “-less” means “without”:
So then it's genius marketing. Stainless absolutely stains and rusts.
Reckless: without wrecks
Nah, that’s without Rekts.
I'm being pedantic here, but stainless steel still has iron in it. The addition of chromium forms an oxide layer on the surface that prevents rust. If the body is rusting, that means they used a shitty grade of stainless. Stainless with an appropriate amount of chromium (and nickel) is expensive as fuck.
Stainless can go goofy after working it. Work hardening can even make stainless magnetic. Sorry, I don't know the physics of why.
Stainless has chromium added. Iron is still the main element. Different stainless steels have various other elements added, like molybdenum. There’s a wide range of SS for various purposes depending on their formability, weldability, corrosion resistance, heat treatment or precipitation hardened. Some are mildly magnetic (400 series), others not (300 series). Big range of cost too. Not sure which one they used. There’s also a finishing process called passivation that should be used to reduce the likelihood of corrosion.
You are absolutely right, just for clarity:
Chromium needs to be > 12 weight-%. If you take 18 w-% Cr and 8 w-% Ni you get an austenitic steel which is (normally) neither magnetic nor able to be hardened.
And if you add 12 w-% Cr, you remove 12 w-% Fe. So formally this is right-ish too...
it rusts less, far less in fact, but it still does rust.
Also there are different grades, i bet they cheaped out
The answer is in the name. It's stainless not stainproof