Comment by jagged-chisel
9 hours ago
They’re all actually aluminum, anodized to the color you choose. The silver one is the only one not anodized.
Filing off the anodized layer is indeed bound to look awful.
9 hours ago
They’re all actually aluminum, anodized to the color you choose. The silver one is the only one not anodized.
Filing off the anodized layer is indeed bound to look awful.
Not to well actually your well actually but they’re all anodized to prevent corrosion and scratches (the oxide layer is harder than the underlying aluminum) - the silver one is just undyed.
And in the pictures you can see a clear color difference between the anodized silver body and the exposed aluminum. It's subtle from a distance, but if you zoom in a bit its pretty obvious
That difference will fade with time.
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Well actually, your not well actually to the well actually was actually a well actually of the well actually. Just sayin’.
What tools are needed to redo the anodized color? Is it doable at home?
You have to grind off the existing Al2O3 protective layer using sandpapers/sandblasters and/or power tools, then ultrasound + acetone wash the parts, then dump it into an acid bath while running electrical current through the pieces. Special dyes can be added for color. Then the pieces are boiled in regular water to further improve durability. The combination of the acid and electricity then boiling cause Al to form beehive shaped surface micropores, and dyes - actually inorganic, so pigments - gets electrically jammed into the pores. The whole outer surface become thick insulating layer of highly chemically resistant and mechanically rigid white/transparent Al2O3 once the process is complete. Voltage, current, waveform, temperature, solution acidity, etc etc affect colors and oxide thickness and shapes and sizes therefore aesthetics as well as durability. "Anodization" refers to this process of electro-acidic-heat formation of the oxide layer, not the coloring. The coloring powder is an extra.
Technically it can be done in a garage, but spot and/or intact application might be difficult. Strict color matching against Apple made things would be impossible.
Yes it’s doable at home, even with fairly primitive tools. You need several chemicals and (if you wish) colored dye.
Anodizing works as follows:
1. Take the MacBook apart
2. Clean it
3. Chemical bath to remove old anodized layer
4. Clean it again
5. Chemical bath with power supply attached. applied voltage+current and duration will determine hardness and thickness of the anodized layer.
6. Clean it
7. Dye it.
8. Seal the dye in a hot water bath.
It’s fairly straight forward to do.
Not strictly DIY because a professional anodizing workshop did the actual anodizing, but cool results nevertheless:
https://lowendmac.com/2024/ryan-andersons-colorized-anodized...
This made me smile because in my book this is at every effect impossible, especially if the goal is getting a functioning laptop at the end of the process. To be clear, it's impossible for me because I lack the knowledge, expertise and tooling to even think about doing it.
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13 year old me who anodised remote control car chassis completely agrees the process is quite simple.
In the context of a MacBook, it’s not. Removing just the aluminium components and leaving everything that doesn’t like baths undamaged is practically impossible for amateurs. I’m not sure it’s something many professionals would take on.
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> 1. Take the MacBook apart
Otherwise known as "remove everything from the chassis, leaving only the chassis."
But do so in a way that lets you fully re-assemble it later on, after you've finished the re-anodising.
> 7. Dye it.
Why the dye? I thought anodising's colour comes only from the voltage used, with no dye needed.
ie you can pick the colour you want, but you need to get the voltage correct for that colour
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Reversing step 1 will be the real tricky part.
How comfortable are you working with chromic acid and boric-sulfuric acid in your home?
As long as it's not hydrofluoric acid...
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To echo the sibling comment: approximately not, it's a strong acid bath which precludes operating electronics in it, and it's electrochemistry.
People do home anodizing all the time, but colored home anodizing on electronics is very rare.
The way to do it would be wrapping it in, say, a wet paper towel with your strong acid solution (but not sulfuric, because that would turn the paper into pure carbon foam) and running outside current from the laptop through the paper to a cathode, or vice versa.
Wouldn't you want to completely disassemble the laptop first anyway, at which point the electronics would be disconnected from the metal parts anyway?
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