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View Full Version : Home Anodising Aluminium and the elusive Sulphuric acid



GeorgeD
02-08-2010, 02:59 PM
Was browsing the net on how to do this and came across this site for the Acid...
http://www.reagent.co.uk/sulphuric-acid-ar/battery-acid.html

And here's the procedure....
http://astro.neutral.org/anodise.shtml (http://astro.neutral.org/anodise5.shtml)


Just thought someone would like their CNC made with Aluminium in a had scatch free surrface with any colour they fancy. :cool:

Ricardoco
02-08-2010, 07:19 PM
Very interesting thank you for that link...

GeorgeD
02-08-2010, 07:26 PM
You're welcome,Rick.

If you want itcoloured? Dylon washing machine dye is the colour dye to go for,stay away frrom the cheaper product ie handwash dylon dye.

Anodising gives Ally a none scratch surface and looks great in desired colours.

Swarfing
02-08-2010, 07:33 PM
Just in case you want to know where to get the acid from, try the motor factors who will sell it in 1 litre bottles as motorcycle battery top up. They should only sell it in 1 litre quantities at a time under their guidelines so if you want more take some friends to buy 1 each :-)

GeorgeD
02-08-2010, 07:36 PM
Not in my neck of the woods they don't. :smile:


Even Caustic Soda is scarce in these parts.

Swarfing
02-08-2010, 07:50 PM
Caustic soda can be got from the cash and carry's or office cleaning supplies :-). Try you local corner shop and get them to grab you some on their next trip for supplies....Easy really, just think outside the box

GeorgeD
02-08-2010, 07:54 PM
I'll have a better chance of selling secondhand fridges to the eskimo's. :heehee:

wal2789s
23-01-2013, 10:57 PM
Was browsing the net on how to do this and came across this site for the Acid...
Battery Acid : UK Chemical Suppliers, Buy Chemicals Online (http://www.reagent.co.uk/sulphuric-acid-ar/battery-acid.html)

And here's the procedure....
http://astro.neutral.org/anodise.shtml (http://astro.neutral.org/anodise5.shtml)


Just thought someone would like their CNC made with Aluminium in a had scatch free surrface with any colour they fancy. :cool:

I had the same issue, I ended up using Anodising First Choice Anodising First Choice - Hard Anodising, Soft Anodising, Colour Anodising, Chromic Anodising, Powdercoating, Electropolishing (http://www.aluminiumplating.com) to remove my anodising as like other said, its hard to get hold of strong caustic based acids to remove anodising, especially hard anodising. They only charged me 10 and gave it a light polish over for free too!

Jonny
01-02-2013, 12:12 AM
That links extortionate pricewise i paid 32 for
10lts Hydrochloric acid 33%
25ltr drum of distilled water
25lrs Sulphuric acid 33%
Unfortunately the place where got it from dont want me to broadcast.

Until last 8 years or so there was only three internet sites providing info how to, none worked.
For me sulphuric at 19% running 14.2v. The only success was if wedged in aluminium in to a hole really tight.

Chas
01-02-2013, 11:49 AM
I've been home anodising using the 720 LCD method for years with good & repeatable results. If you follow the rules it's easy.

Caswell have an excellent forum that caters to beginner's & experienced alike.

Anodizing Questions (http://forum.caswellplating.com/anodizing-questions/)

You don't need to spend 100's on equipment but I'd STRONGLY recommend an investment in a constant current power supply if you don't want every run to be an experiment.

I get my acid & water from a local truck & forklift battery supplier in 25l drums, every town should have one nearby, ask at your local forklift hire & sales Co'. Caustic soda should be readily available from any 'proper' DIY hardware shop, I get mine from Wilko's at 2ish for 500g.

Most of my failed runs in the early days were down to using alu' wire for the part or allowing the temp in the tank to rise too much. Now I use titanium welding rods & a bilge pump to circulate the acid.

Jonny
01-02-2013, 03:07 PM
Started off with one of these, didnt last long GW Instek GPS-4303, 200W Quadruple Output DC Power Supply, 0-30V, 0-3A from Conrad Electronic UK (http://www.conrad-uk.com/ce/en/product/511540/GW-Instek-GPS-4303-200W-Quadruple-Output-DC-Power-Supply-0-30V-0-3A)
In a panic needed something quick next day Triple Output Power Supply : Bench Power Supplies : Maplin Electronics (http://www.maplin.co.uk/triple-output-power-supply-5925) Gone down in price 21.

Caswell wasnt doing the kits then. Have done hard anodising three times by accident, dont ask how not a clue essentially same method i used to use for normal sulphuric.
Too true, drove me round the bend loosing electrical contact. Waste of time using aluminum wire, used to use wedges rammed in to a hole dead tight. 50/50 whether lost electrical contact. Used titanium a few times later on with a wall of lead lining one rear face of a fish tank. Larger 4ft tank lined with aluminium foil on bottom and rear face.

Always had trouble with the colouring and eventually figured its got to be warm but well short of boiling. The part will seal around 90+ degrees or become brown/purple/blue. Tried everything i could get my hands on for a dye, no substitute for the real thing.

Does the sulphuric go off, the little tanks been outside for at least 5 years?
4ft fish tank broke gallons.