Bill describes how metals like aluminum and titanium are made resistant to corrosion by growing an oxide layer into the metals. These is the same process used on many Apple products. This video is based on a chapter in the book Eight Amazing Engineering Stories; learn more at

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23 Comments

Adam M

February 25, 2020

why dont people do this to steel?

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believe 2022

February 25, 2020

Makes a lot of sense. I always wondered why certain aluminum products stayed the same color even after being scraped. 👍

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Sharbanee Bhatta

February 25, 2020

Creative video to understand engineering concepts

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krisel

February 25, 2020

Hello Everyone, I have a problem with anodising the pressure casting aluminium, means the alloy with high silicon contain (Si>6%). Does anybody tried this? Which parameter could be a problem, which should be combined?

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steve.shijun wong

February 25, 2020

i am a good student

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Apistosig

February 25, 2020

aluminium is not metal and therefore does not RUST. Alloys oxidize

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erg0centric

February 25, 2020

Blued steel?

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Demented One

February 25, 2020

i was production foreman at a Anodizing company…fun WOW! Bright Dip Tank = Nitric, Sulfuric, and Phosphorus Acid mixed with water and heated to 97 degrees. full body PPE. hand in, bone out.

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tihzho

February 25, 2020

1:43 This is also the how pearlescent pigments are made. A layer of TO2 is deposited on very small mica (or borosilicate) platelets so the color is produced is by the thickness of the layer. TO2 exists in two crystal types, Anatase and Rutile and they give different results.

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Koolaid Black

February 25, 2020

Fantastic video, very interesting.

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Love Movement

February 25, 2020

amazing

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Siegfried Pretsch

February 25, 2020

Sorry, but this has been around long before Apple was around.

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Siegfried Pretsch

February 25, 2020

Sorry, but this has been long before Apple was around.

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Siegfried Pretsch

February 25, 2020

Sorry, but this has been long before Apple was around.

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Geoff Geoff

February 25, 2020

Sponsored by apple

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BuddhaBebop

February 25, 2020

rather comes off as sponsored content doesnt it?

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Jake Herrington

February 25, 2020

it's elton john!

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Johnny Poppinseed

February 25, 2020

Ya but can it run crysis?

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oOoConstanceoOo

February 25, 2020

Exceptional video. it told me exactly what I wanted to know regarding WHAT anodizing was, but what to expect. Thanks for for such a complete, and easy to understand explanation!

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Ian McGreevy

February 25, 2020

It is said : There are three certainties in an engineer’s life: death, taxes and corrosion

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Rahul Patil

February 25, 2020

While your explanation is top notch, really appreciate it. I couldn't help but imagine the repercussions of mass anodization of "everyday objects" considering the amount of toxic water that is created in the process….Me thinks Powder coating is lesser of the two evils.

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Jerry Rupprecht

February 25, 2020

That is an old laptop

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Turkish Delight

February 25, 2020

1:00 Elton john, that you?

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