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Greg_e
Posted on Tuesday, November 14, 2017 - 08:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I know there are a few people making things on here, and I just stumbled upon a different way to Anodize aluminum that is a little safer than using sulphuric acid for the home machinists. It uses a sulfur salt which is far less dangerous and available for swimming pool pH modification. Haven't tried this yet, but it won't take long before I gather the materials.

http://www.observationsblog.com/sciencetechnologye xperiments/anodizing-and-dying-aluminum-without-ba ttery-acid

https://www.youtube.com/watch?v=7jFN3l_mrKk

If you try this, let me know how it works, probably take me a couple weeks to get going.
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Damnut
Posted on Wednesday, November 15, 2017 - 03:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Watching with excitement. Let me know how that works out.
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Greg_e
Posted on Sunday, November 19, 2017 - 06:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Went to Lowes and got a bottle of pH down for the sodium bisulfate. Went looking for the lye to clean the aluminum and found nothing as it is all out of stock. Thinking it was out because it is used in some illegal drug, I looked it up and lye is somehow used to make methamphetamine.

I wonder what else we can use to clean and etch the aluminum that won't set off alarms.
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Greg_e
Posted on Sunday, November 19, 2017 - 08:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Looks like sodium carbonate might work, Clorox pH up product for pools. Knew I should have picked up a container of this today.

Can also be made by cooking baking soda.

I did also get some Rit dye in black and in red, just to play around.
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Torquehd
Posted on Sunday, November 19, 2017 - 09:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

random side note - sodium carbonate ("washing soda") is added to molten aluminum to degas it prior to casting.

I googled "etch aluminum with vinegar" and this video came up

https://www.youtube.com/watch?v=HNZZ8RJfzNQ

There are some articles on boiling a solution of vinegar and water to remove oxidation from aluminum pots and pans. That may be a possibility.
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Greg_e
Posted on Monday, November 20, 2017 - 09:31 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The vinegar works, but is normally very slow. Acetic acid also works, but is again pretty slow unless you are buying the lab grade "pure" stuff. Nitric acid works really well and I think it also keeps the smooth surface on polished pieces, but that's getting into that less safe area again.
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