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#419091 - 11th Jul 2010 11:37am Removing rust with electrolysis
DavidB Offline
Wiki Guide

Registered: 7th Dec 2003
Posts: 5634
Loc: Bebington, Wirral
Finally got round to rebuilding more calipers, so I thought I'd do the electrolysis thing.
All you need is a plastic bowl, a big sacrificial piece of metal, a battery charger, bicarbonate of soda and a rusty piece of metal.

Fill plastic bowl to cover rusty item. Put a tablespoon of Bicarbonate of soda in for every gallon water (about 5 litres).

Connect black wire (negative) to the item being de-rust-ified, and the red to the sacrificial metal (a big spanner in this case). You can submerge the black wire, but don't submerge the red wire, or it'll short and blow the charger:



Five minutes in and bubbles were rising from the caliper and the rust was 'flowing' to the spanner:



Half an hour later, and the water was turning a murky brown:



2 hours later, and the caliper was invisible due to rank water (I wasn't sitting there watching all this wink ):



I turned the caliper every three hours to get proper coverage (the side facing towards the spanner got cleaner):





Scum:



This was about 9 hours of being in soak - there will be a very loose layer of rust which comes straight off with a wire brush or from scraping with a screwdriver:







Poor spanner:



Next time will use a proper surrounding metal thing.
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#419097 - 11th Jul 2010 11:52am Re: Removing rust with electrolysis [Re: DavidB]
_Ste_ Offline


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Registered: 7th Aug 2005
Posts: 16051
Loc: New Brighton
Looks to have worked a lot better than the vinegar happy
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#419108 - 11th Jul 2010 12:30pm Re: Removing rust with electrolysis [Re: _Ste_]
Pinzgauer
Unregistered


Thanks for that. The results look quite impressive ! Any idea of what sort of load/amperage was involved when it was in "full fizz" mode ?

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#419109 - 11th Jul 2010 12:59pm Re: Removing rust with electrolysis [Re: ]
Sanchez Offline

Wiki Veteran

Registered: 17th Dec 2003
Posts: 8019
Loc: my house
full fizz mode lol, I think 12v is enough, maybe 24.
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#419110 - 11th Jul 2010 1:00pm Re: Removing rust with electrolysis [Re: Sanchez]
Sanchez Offline

Wiki Veteran

Registered: 17th Dec 2003
Posts: 8019
Loc: my house
oh and prob at 2amp
_________________________
Uncertainty or not knowing causes depression, Im happy because I know I'm going to die one day!

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#419111 - 11th Jul 2010 1:13pm Re: Removing rust with electrolysis [Re: Sanchez]
DavidB Offline
Wiki Guide

Registered: 7th Dec 2003
Posts: 5634
Loc: Bebington, Wirral
I used 3a. smile Should've taken a photo before, it was covered in that scaly, thick rust.
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