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Rust removal using citric acid

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Rust removal using citric acid

Post by Woodsman on Sat Sep 13 2014, 08:32

Having read the posts on oxalic acid I thought throw this in.
Citric acid also works very well. Obtainable as crystals from home brewing shops or more economically online from ee-by-gumbay.
Get the cheapest - you don't need food grade. If you can use hot water even better - but don't breath the fumes.
Also great for descaling kettles - so you can book to the household cleaning budget rather than engine restoration!

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Before and After

Post by Woodsman on Sun Sep 21 2014, 13:48




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Re: Rust removal using citric acid

Post by Locknut on Sun Sep 21 2014, 17:47

Whow that is an impressive result from such a basic cheap product - I will certainly give that a go.Thanks for mentioning it.
Kev.

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Re: Rust removal using citric acid

Post by Woodsman on Mon Sep 22 2014, 07:31

You're welcome Kev. I used a mixture of about six or seven tablespoons of citric acid crystals in one and a half litres on water. Pickled for 24 hours then 5 minutes with a wire brush.
BTW I have just thought about making the solution as usual then adding wallpaper paste to make a gel that you could brush on. Will give it ago on post results.

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Re: Rust removal using citric acid

Post by StewartH on Mon Sep 22 2014, 12:29

Hello Paul,

Many thanks for sharing this and what impressive results - the gel idea is a cracker!

I'm on the case myself for a number of smaller components!

best

Hamish

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Re: Rust removal using citric acid

Post by Woodsman on Tue Sep 23 2014, 07:56

Hi Hamish,
If you only have small items then use a plastic pot and hot water.
Really thick rust might require a second pickling after first wire brushing.

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Citric Acid Gel

Post by Woodsman on Tue Sep 23 2014, 10:29

I used a cup full of citric acid crystals in a litre yoghurt pot (Milbona Greek style from Lidl - very nice !)
Stirred well then added about half a cup of Wilkos finest wall paper paste.
Follow the instructions on the packet but go for a pretty thick mix. It adheres quite well to vertical surfaces so good for large items.
Results below - not to bad after overnight soak and a five minute scrub but will apply second coat and post result tomorrow.

Before


Gel applied


After one application

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Re: Rust removal using citric acid

Post by StewartH on Wed Sep 24 2014, 08:44

Very nice results - and you beat me to it !

What I like about citric acid is its not as corrosive as other methods - really useful thread!

best

Hamish

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Re: Rust removal using citric acid

Post by Woodsman on Wed Sep 24 2014, 12:30

And a lot cheaper than Hammerite gel  - £13.72 per litre ! Very Happy

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Re: Rust removal using citric acid

Post by Woodsman on Thu Sep 25 2014, 07:48

Final result after second application:

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Re: Rust removal using citric acid

Post by StewartH on Thu Sep 25 2014, 09:22

That works an absolute treat! - now I need to somehow ask the wife if i can lie an engine block in the bath Smile

I take it you were using a stiff brush and water to remove the gel?

best

Hamish

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Re: Rust removal using citric acid

Post by Woodsman on Fri Sep 26 2014, 08:30

Dead right. Wire brush and rinse off with water. Reckon it's ready for primer now. Very Happy

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Latest Update

Post by Woodsman on Fri Dec 05 2014, 17:35

Been working on the Villiers MK25 and, as seems usual, the air filter mesh was a mass of rust. So we thought why not try the magic potion?
First soaked in paraffin for a few hours to loosen up any remaining oil, then heated it up with hot air paint stripper to burn off residue - a tad smokey, should have done it out in the fresh air.
Then dropped it in citric acid solution overnight and look at the result. Apologies for not taking a before pic, you'll just have to trust me Smile


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Re: Rust removal using citric acid

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