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PostPosted: Mon May 11, 2015 11:47 pm 
Retro Guru

Joined: Tue Apr 15, 2014 9:54 am
Posts: 463
The topic tells averything. :)
Today I rebuild my seatpost, remove the faded, scratched red anodised surface with Na3PO4, then clean, and polished it...
:)


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PostPosted: Wed May 13, 2015 11:10 pm 
Old School Grand Master

Joined: Tue Nov 11, 2008 1:45 pm
Posts: 5512
Location: UK
Good job on that seatpost, any more info on the process used? :)


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PostPosted: Thu May 14, 2015 10:32 am 
Old School Hero
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Joined: Sun May 03, 2015 4:51 pm
Posts: 217
Location: Yorkshire / Devon
My guess - Trisodium Phosphate solution (OP put chemical composition in their post, you can buy it on ebay) to strip old coating and then some time at a buffer wheel

nice job :)

bit of googling does brings up Caustic Soda as an option some folks use - whatever you do beware you are removing material (and eventually strength) with these chemicals so work quickly and clean well


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PostPosted: Thu May 14, 2015 4:15 pm 
Retro Guru

Joined: Tue Apr 15, 2014 9:54 am
Posts: 463
Hi!

Trisodium phosphate. :)
I put it into hot water, mix it, and then put the part into it.
Then I wait about 15minutes, and take the parts out, clean them with fresh water. Some parts has got a black layer, but it can be easily remove with water. If it needs, then repeat the first step (in the forts round, some parts remain...pink. :) ).
Then water again, remove the black layer, and after drying some steel wood, sandpaper(1200), and then polishing with Autosol. :)


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PostPosted: Thu May 14, 2015 9:12 pm 
Retro Guru
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Joined: Wed Feb 20, 2013 8:23 pm
Posts: 2002
Location: Durham
Great job :) .


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PostPosted: Thu May 14, 2015 9:25 pm 
Retro Guru

Joined: Tue Apr 15, 2014 9:54 am
Posts: 463
Thanks. :)

The next step is evident: anodizing at home. :D
I will try, and make a looong thread with a lot photo here... :)

Or I will blow up. :D


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PostPosted: Fri Sep 23, 2016 9:17 pm 
Old School Hero

Joined: Mon Sep 19, 2016 8:06 pm
Posts: 222
So did it blow up?


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