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General De-rusting of parts. Rust removal methods.

I'm keen to try molasses, it combines with the rust and makes it water soluble. Apparently its great for engine blocks as you can de-rust inside and it doesn't matter if some is left in crevices as its not acidic.
 
I keep a 5l paint tin with a 50/50 mix of acetone and hydraulic oil to throw in small parts. Gets off a lot of surface rust. I like the idea of electrolysis though....definitely going to have a go at that.
 
The first time I tried the electrolysis method I was a bit underwhelmed as it seemed to do nothing. I tried again but this time I put the battery charger onto a battery and then connected everything up and it worked great. I degrease everything first and then wrap wire around the item and in it goes. The carrot soup it makes is pretty gross though! Ive put in anything that will fit in the pastic crate I have set up.
 
Hmm carrot soup, I think this was a back plate.
 

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Ive got some aluminium engine parts which have suffered from quite a bit of corrosion in storage (HiIlman Imp engines).
I think the casting are salvageable, but Im wondering on the best method to remove all the oxidation etc and get them back to bare metal for assessment and potential salvage and rebuilding.

I've a large plastic storage bin that I can fit a head (perhaps even a block) into and submerge. I was planning to buy some citric acid powder from Amazon.

Questions;
Has anyone used a Citric acid bath on aluminium castings?
What % should be used?

Any other tips or suggestions..?
 
Ive got some aluminium engine parts which have suffered from quite a bit of corrosion in storage (HiIlman Imp engines).
I think the casting are salvageable, but Im wondering on the best method to remove all the oxidation etc and get them back to bare metal for assessment and potential salvage and rebuilding.

I've a large plastic storage bin that I can fit a head (perhaps even a block) into and submerge. I was planning to buy some citric acid powder from Amazon.

Questions;
Has anyone used a Citric acid bath on aluminium castings?
What % should be used?

Any other tips or suggestions..?
I’m pickling some steel parts at the moment and didn’t know the percentage of mix. I’m using 50g of citric acid crystals to 1 litre of water which was warm when I mixed it. This mix seems to be working , it’s been in 12 hours and you can see it having an effect.

No experience with Aluminium sorry.
 
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