How To Use Oxalic Acid To Clean Rust From Screws
Is Oxalic acid "better" than citric acid-rust removal??
10-23-09, 09:11 AM
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Is Oxalic acid "ameliorate" than citric acrid-rust removal??
I apologize if this has been answered earlier.
Is oxalic acid a "better" rust remover than citric acid?
I've used citric acid to rehab wheel and motorcycle parts post katrina-worked ok.
I'm ever looking for an easier/cheaper way of course.
Thanks
Charlie
10-23-09, 10:07 AM
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Aha! A few months back I asked if anyone had any experience with citric acrid merely got no respond. You lot say yous've used information technology successfully, though? What concentration do you use, how long do you soak things, etc? Oxalic acid works well and I use information technology fairly often only I've always been a footling wary about its toxicity. If citric acid worked equally well I'd switch over to it with no hesitation.
x-23-09, 10:37 AM
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I've used lemon juice as a solvent, but scrubbed with aluminum foil. What concentration is citric acrid in a citrus-fruit juice? And.... what would happen if I just let information technology sit in the juice without scrubbing?
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10-23-09, ten:39 AM
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Copied from the other thread:
Oxalic acid is superior to other acids for rust removal because it forms complexes with iron ions much ameliorate. The oxalic acrid tin pull the oxidized atomic number 26 out of the rust and into solution where information technology can exist washed away. Anyone who has seen a stake green color in the oxalic acid bath after soaking parts for a while has seen the atomic number 26-oxalate complex ([Iron(III)(C_2O_4)_3]^{3+}) in solution. Other chemicals will practise this, including acerb and citric acids, but because of its construction oxalic acrid is the optimal choice.
Aye, I'yard a pharmacist.
10-23-09, ten:47 AM
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Originally Posted past wrk101 
I buy five pounds of oxalic for under $10, and I use it in very dilute concentration (0.ii%).
What are you paying for citric, and what concentration are you using?
wow, please tell me where you find five pounds for $10? i'1000 definitely getting ripped off, i buy 12 oz for $7 from my local hardware shop!!!!
ten-24-09, 07:16 AM
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Thanks for the info.
With the citric acid I use 5-x%(by weight-one lb in a couple of gallons),Leave it in for 24 hours-check, leave information technology a bit longer if necessary. It removes all the rust.
I've used it on aluminum also, just grungy aluminum always leaves those pits, so..
Cheers
Charlie
10-24-09, 12:49 PM
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You tin can also employ CLR as it has chelators(probably NTA and/or EDTA) or phosphoric acid or gluconic acrid or sodium hydroxide or get the galvanic route with a car battery and sodium bicarbonate.
Anything that'll solubilize Fe+2 or Fe+3 will piece of work but strong acids can lead to further corrosion in a hurry if non neutralized.
Oxalic acid is very good because it's structure forms a nice v-membered 'band' with the iron.
I too would like to know where you can get oxalic acid or citric acrid and so cheaply without having to buy it in 50lb. bags from an industrial supply source.
Don't let your animals drink the oxalic acrid solution. It'due south very toxic to them. Ethylene glycol (anti-freeze) oxidizes in the torso to oxalic acid. Bad for the kidneys.
ten-24-09, 02:43 PM
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What about with regards to pigment?
Will using something else like citric acid or CLR be worse for paint (since people commonly have pretty skilful luck with pigment and oxalic acid)
10-24-09, 03:forty PM
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Originally Posted past bbattle
You can likewise use CLR every bit it has chelators(probably NTA and/or EDTA) or phosphoric acrid or gluconic acid or sodium hydroxide or become the galvanic road with a auto bombardment and sodium bicarbonate.
Anything that'll solubilize Fe+two or Fe+3 will work simply strong acids can lead to further corrosion in a hurry if non neutralized.
Oxalic acid is very good considering it'due south structure forms a nice 5-membered 'band' with the iron.
I too would similar to know where you can become oxalic acid or citric acrid so cheaply without having to purchase information technology in 50lb. bags from an industrial supply source.
Don't let your animals drinkable the oxalic acid solution. Information technology's very toxic to them. Ethylene glycol (anti-freeze) oxidizes in the body to oxalic acid. Bad for the kidneys.
Sad to be ignorant, but what is CLR?
10-24-09, 06:xiv PM
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I need to soak all my erstwhile parts in oxalic acrid. Where would the cheapest local store (Lowes, Home Dept., Ace, etc.) exist to buy this stuff? And how much of it would a guy need to soak a crank set, bb, pedals, stalk, shifters, and derailers? Sad, I will research it tonight when I get dwelling house!
10-24-09, 08:21 PM
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Originally Posted by ottothecow
What about with regards to paint?
Volition using something else similar citric acid or CLR exist worse for paint (since people ordinarily accept pretty practiced luck with paint and oxalic acid)
I take never had it damage any of my paint subsequently 24hour soaks, simply, it will harm some decals.
ten-24-09, 08:44 PM
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Originally Posted by Servo888
I accept never had information technology damage any of my paint subsequently 24hour soaks, only, it volition damage some decals.
Would the decals on a Schwinn varsity be fine?
10-24-09, 09:fifty PM
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Originally Posted by bbattle
stiff acids can atomic number 82 to farther corrosion in a hurry if not neutralized.
isn't that pretty much by definition? 
Merely what you do make sure y'all proceed an eye on the process (don't allow it sit down and look at it after a week) and after everything is gear up and washed rinse it with (preferably distilled) water, dry it, and let is sit for a while before the next stride
x-25-09, 06:20 AM
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Originally Posted by EjustE
isn't that pretty much by definition?
indeed. as it is removing rust it is as well promoting new rust. it's only that the rate of the one-time is more rapid than the charge per unit of the latter, so information technology always appears as though the rust is "disappearing". it's really forming and so getting removed.
so the key is non to let whatsoever pieces soak longer than is needed.
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