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Old 21st December 2009, 09:08 PM
Peter-C Peter-C is offline
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Default Electrolysis

What parts have been derusted using electrolysis, I fancy having a go tomorrow.

Peter
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Old 21st December 2009, 10:34 PM
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alga alga is offline
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Anyone strong in chemistry? What reactions are going on on the electrodes?

In my limited understanding, on the cathode Na+ gets an electron, turns into metallic Na, which then reduces Fe2O3 to Fe and Na2O. This in turn reacts with water, turns into NaOH + H2. Bubbles.

On the anode, CO3-2 gets looses the charge, turns into CO2 and O2, bubbles. Right?

I think the solution must turn progressively more alkaline as CO2 escapes.
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Old 21st December 2009, 10:41 PM
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davidimurray davidimurray is offline
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Powler - you can chuck just about anyhting metal you like in, but I wouldn't reccomend anything with bearings in. I've done drums, brake backplates, calipers, engine pulleys etc etc

Alga - I thought I read somewhere that the reaction gave off Hydrogen
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Old 21st December 2009, 10:46 PM
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gingea1pom gingea1pom is offline
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This month’s CKC has a good article on the whole electrolysis/chemical de-rusting thing.

Also a picture of a rather striking bloke on page 56 (picture 38, the one on the right)
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Old 21st December 2009, 11:04 PM
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alga alga is offline
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Awww, going to check the mailbox...

Nope, still empty. And it's frigging -15°C outside!
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Old 21st December 2009, 11:14 PM
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gingea1pom gingea1pom is offline
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I would wait for it to turn up; it is a 5 page article with 32 pictures. Very good
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Old 22nd December 2009, 02:07 AM
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alga alga is offline
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OK, the exact chemistry is a mystery even to specialists, here's an article about it: http://www.holzwerken.de/museum/link...lanation.phtml
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Old 22nd December 2009, 05:57 AM
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Land Locked Land Locked is offline
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There was an article some time back explaining why one should not use stainless. link (about 4 posts down)
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Last edited by Land Locked : 22nd December 2009 at 05:59 AM.
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Old 22nd December 2009, 06:41 AM
adrianreeve adrianreeve is offline
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I did my sierra front and rear hubs, and have just done all four calipers - it's brilliant and will send you looking for more rusty stuff to do!

If you can, I would use a sheet of mld steel rather than strip, as you will get quicker results.

The great thing is the process won't attack good metal, so bearing surfaces etc are unaffected

Cheers

Adrian
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Old 22nd December 2009, 09:37 AM
Peter-C Peter-C is offline
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Cheers,

Hubs here we come !!

Peter
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