I read somewhere that pure iron does the same thing.
The reason it rusts is the impurities which are almost always in it.
Man ... did YOU get all screwed up by that Republican intro !
Interesting video. I’ve always heard about anodized surfaces, but didn’t know what it was.
Eugene Stoner’s anodized alum. Receiver.Yayyyy!
It’s a commie killing wonder gun.
Being a recovering aircraft engineer I have seen a lot of anodizing parts in my day. Neat stuff. But in a big metal finishing shop you don’t want to see how the sausage is made. The conditions are quite unpleasant.
Been around for many decades in aerospace and car racing parts.
Trying to make it sound like some sort of apple innovation is pathetic. I was buying anodized hydraulic fittings forty years ago for hobby stuff.
Pinging dayglored, Shadow Ace, and ThunderSleeps because it's not just Apple that uses this technique.
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I once worked in the quality control department of a factory. There were all kinds of interesting tools for testing different things. One of them was to electronically test the thickness of anodizing. We had a lot of tools that would measure to 0.001”, but the anodizing tool divided each 0.001” one-thousand times. It measured how many millionths of an inch the anodizing was. We call them “mils” (for millionths) even though that was not technically correct.
Thanks for posting. I’m an ME with a few materials courses 40+ years ago, but I never studied anodizing. This guy does a great job of putting the process into easy to understand lay terms. What I didn’t understand is why titanium can use light interference based on the oxide thickness to create different colors, but aluminum uses the dye process.