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Thread: Anodising help.
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28th November 2008, 12:48 AM #1
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Anodising help.
Hey all.,
Does anyone here have some experience with anodising aluminium?
My specific problem is that I've made some parts out of alloy sheet
with cuts, bends and drillings and I've sanded these down from 120
to 360 to finish up at 600 grit. Now is this going to be smooth enough
so that I get a smooth, even anodised finish? The parts are smooth to
the touch but if I hold them at a certain angle I can see sanding lines
everywhere. Will these be visible after anodising? And if so, what's the
proper way to do it?
Thanks.
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28th November 2008, 07:47 AM #2
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oldnewby
hae a look at thsi site
you might find something there that will help you.
http://www.mini-lathe.com/Anodizing/...g_aluminum.htm
I haven't tried doing myself but I think the surface finish you have when you start will still be there when you finish. Maybe someone here has done it and can respond better.
regards
bollie7
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28th November 2008, 09:47 AM #3
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Try sand blasting before anodising, this usually gives a good anodised
finish.
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28th November 2008, 09:45 PM #4
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I have had some parts anodised from time to time by a company in Newtown (Sydney). The advice I received from them was to finish the product with a scotchbrite pad.
The results has always been very good by using this but it does depend on the quality of the aluminium used. Some types of aluminium anodise better than others. Anything with a high content of silicon will not anodise well, but machines well. Ask me how I know...
Warren
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28th November 2008, 10:11 PM #5
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Thanks for the help guys.
After doing some more research I've decided to go for a brushed finish,
so I just have to go over all the parts again with some coarser paper and
keep the sanding marks straight.
Thanks again.
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28th November 2008, 10:32 PM #6
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Whatever marks you can see before anodising you will see after anodising.
Standard anodising is only 10 microns thick, so it doesn't cover up imperfections.
I use a scotchbrite pad with soapy water when i need a consistent finish.
Mike.
www.ColonialPlantationShutters.com.au
Use your garage or home workshop to make Plantation Shutters as a business
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29th November 2008, 12:24 AM #7
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Although I have not tried this, try some test pieces in a Caustic solution, and time each piece to see if it smooths the finish. Caustic will dissolve aluminium completely over time, so this may do the job. I would be interested to try this my self and see what this will do.
A word of warning, DO NOT GET CAUSTIC IN YOUR EYES OR ON YOUR SKIN. Please use safety goggles and gloves, especially if the caustic is of a strong batch.
PS: Have you though of using fine cutting paste, and buffing the Ali like you would on a cars paint work?
