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 Post subject: Re: Anodising
PostPosted: Fri Jul 26, 2013 7:50 pm 
retrobike rider
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Joined: Thu Apr 17, 2008 1:24 am
Posts: 7563
Location: Manchester
02gf74 wrote:
shot or sand blasting is too harsh on aluminium frames - i am not expert on this but soda blasting is kinder. some one can correct me but i understand that any type of blasting will leave a dull surface - not sure how well that wioll look when anodised.


Depends on the finish you want. Anodising after blasting will give a matt finish.
The shinier the finish, the brighter the anodising will be.
I have some cranks at home that are half blasted half polished, if I remember I'll post a picture later.


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 Post subject: Re: Anodising
PostPosted: Fri Jul 26, 2013 9:25 pm 
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Posts: 825
it's true that shot and bead blasting is harsh on aluminium, and not recomended, but that said, you can get away with using a shell medium for aluminium, to provide a good key for painting, a lot of the time it's down to the guy thats doing it, spend too much time on one area and you can wear the metal away..


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 Post subject: Re: Anodising
PostPosted: Fri Jul 26, 2013 9:58 pm 
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Joined: Wed Apr 18, 2012 9:47 pm
Posts: 324
Location: Stratford upon Avon
Its yellow and seems quite hard:


Image
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Its a shame about the damage as most of it is in good condition.


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 Post subject: Re: Anodising
PostPosted: Sat Jul 27, 2013 12:02 am 
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yeah that's "hot mango" and very tough paint, underneath that you'll find some cool "easton" stamps on the tubing if you're lucky


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 Post subject: Re: Anodising
PostPosted: Sat Jul 27, 2013 10:53 am 
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Location: Stratford upon Avon
I have one on the top tube of my other zaskar

Image


The paint does seem hard, i think the bike was left outside for a number of years so it has lasted well! :shock:

What do you think of the bubbling? Do you think the metal will be in bad shape underneath?


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 Post subject: Re: Anodising
PostPosted: Sat Jul 27, 2013 12:37 pm 
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
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Location: Yorkshire, England
Scrape the paint off and have a look, it's not holding on to anything anymore.
A rough sanding and nitromors will get you through other part you might want to look at.


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 Post subject: Re: Anodising
PostPosted: Sat Jul 27, 2013 3:00 pm 
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Joined: Sun Jun 23, 2013 3:12 pm
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Location: Southernmost US
pete_mcc wrote:
Just remember that unlike paint anodising is not going to cover any imperfections so if the frame is scratched then the anodising will show that and often amplify if, if there is a rough patch then it will be an anodised rough patch after.

What ever time you think you need to spend on polishing, double it. Do a half arsed job on polishing and the anodising will look terrible.

Also remember that any ferrous metal will need to be removed - any rivnut bottle bosses etc as these react in the anodising tank


Truer words have never been spoken. :D


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 Post subject: Re: Anodising
PostPosted: Sat Jul 27, 2013 7:55 pm 
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the oxidising(bubbling) doesn't have to be the end of the world, it depends how far it's gone and where it is on the frame. you could try and scrape the damaged paint off and go from there, ti's worth doing, it's a lovely frame


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 Post subject: Re: Anodising
PostPosted: Sat Jul 27, 2013 11:00 pm 
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Took a knife to the worst area, the paint flaked off really easy. The oxidation is quite deep but i think it will flatten out with some fine paper and a polishing wheel.

Image
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What do you think?


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 Post subject: Re: Anodising
PostPosted: Sat Jul 27, 2013 11:09 pm 
retrobike rider
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Joined: Thu Apr 17, 2008 1:24 am
Posts: 7563
Location: Manchester
It will still look a mess after anodising, but its not in the most noticeable area. I did a seatpost a few weeks ago that wasn't as bad, I'll try and find a picture of it.


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