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Approximate amount of Oxalic Acid to use

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Approximate amount of Oxalic Acid to use

Old 05-09-12, 02:33 PM
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kingkenobi
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Approximate amount of Oxalic Acid to use

I have a 1979 Raleigh Super Grand Prix that I am working on restoring. I have stripped it down to the frame, and am about to give it an oxalic acid bath to remove the rust.

I got a kiddie pool that i am going to use, and up to the fill line, it holds approximately 85 gallons. Along with the frame, I will also be submerging the pedals, front fork, steering tube, and sprockets. How much oxalic acid should i use? Also, approximately how long should the bath be?
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Old 05-09-12, 02:40 PM
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I use a tablespoon per gallon. Although I have left things soak overnight sometime, normally it takes much less time. Check your pieces often and if they look ok, take them out and scrub.

-G
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Old 05-09-12, 07:26 PM
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wrk101 (aka "Thrifty Bill") has said 0.2% oxalic acid by weight, water weighing 8.33#/gallon. Here's the bibliographic info:
http://www.bikeforums.net/showthread...1#post12033799
Doing the math is an exercise left for the reader.
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Old 05-09-12, 07:39 PM
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I'm also part of the 1T per gallon club. It's very important to fully degrease everything as much as possible for the OA to do it's work. At that concentration you can leave things long enough to get the job done with periodic scrubbing to assess your progress.
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Old 05-09-12, 07:45 PM
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Originally Posted by 23skidoo View Post
It's very important to fully degrease everything as much as possible for the OA to do it's work. At that concentration you can leave things long enough to get the job done with periodic scrubbing to assess your progress.
I'm treating rust inside the frame tubes, so scrubbing would be rather difficult and cumbersome. any suggestions?
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Old 05-09-12, 07:58 PM
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Originally Posted by kingkenobi View Post
I'm treating rust inside the frame tubes, so scrubbing would be rather difficult and cumbersome. any suggestions?
Wiegles Frame Saver or Boeshield. Go ahead and put high pressure water through the tubes to knock off any loose rust, dry and treat.
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Old 05-09-12, 08:09 PM
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A TABLEspoon per gallon???

Holy schmolly. I get good results with about 1/4-cup in a 25-gallon rubbermaid bin filled to about 20 gallons.
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Old 05-10-12, 09:26 AM
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Originally Posted by roadrunner2012 View Post
Go ahead and put high pressure water through the tubes to knock off any loose rust, dry and treat.
thanks! now to figure out what to use for the high-pressure.
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Old 05-10-12, 02:04 PM
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I used a cheapo refrigerator coil dusting brush from Ace Hardware for the seat tube and head tube.
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Old 05-10-12, 02:07 PM
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Originally Posted by roadrunner2012 View Post
Wiegles Frame Saver or Boeshield. Go ahead and put high pressure water through the tubes to knock off any loose rust, dry and treat.
Do they do anything to stop rust that is already present or do they just prevent the formation of new rust?
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Old 05-10-12, 02:20 PM
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Originally Posted by gmt13 View Post
I use a tablespoon per gallon
ok so 1 TBP/gallon, 84 gallons. That's 84 TBP. 1 TBP is 1/2 an oz, so this comes out to 42 oz. So I should put in like 2 1/2 pounds of Oxalic acid? That seems a tad excessive.
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Old 05-10-12, 02:53 PM
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IMO, that's way too much solution. Maybe find a smaller pool or build a frame and line it with poly. You should be able to do the job with almost a third of that. A little safer too.
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Old 05-10-12, 02:54 PM
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For a 0.2% solution, use 0.6tbsp/gal (1.4 lb. or 25 fl. oz. of dry acid for the 84 gallons of water)

For a 0.3% sol'n, use .9 TBSP/GAL (2.1 lb. or 38 fl.oz.).

By the way, I actually weighed the powdered/granular oxalic acid per volume (bought from an online taxidermical shop).

BTW, don't just dump the 84gal of acid anywhere.
I would think that it would be quite toxic in a waterway and unsafe for ground disposal at that concentration. This isn't an enviro-friendly chemical at all.

Also, why not uses a smaller pool as clubman suggested, and also flip the frame over in a much shallower pool. The soak duration isn't really critical, and I would never use chemicals to remove internal rust from a frame anyway.
My Pedersen racer deposited a handful of loose rust into the bottom bracket shell during the first service interval of the bottom bracket assembly, then the rust stopped coming. Some LPS-3 or whatever will prevent any further rust activity inside.
How thoroughly will you be able to rinse out the acid from the inside of the tubes? It's an ionic material that will certainly accelerate steady future corrosion if any is absorbed or left inside!

Last edited by dddd; 05-10-12 at 09:51 PM. Reason: .3% was 3%, and .2% was 2%, both corrected now
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Old 05-10-12, 03:56 PM
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To use less fluid put bricks/rocks in the water around the frame to displace water
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Old 05-10-12, 06:10 PM
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Originally Posted by pitbull007 View Post
To use less fluid put bricks/rocks in the water around the frame to displace water
Eureka! Or something remotely similar to that...
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Old 05-10-12, 07:08 PM
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How do folks dispose of the used OA solutions?
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Old 05-10-12, 07:29 PM
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Originally Posted by gmt13 View Post
I use a tablespoon per gallon. Although I have left things soak overnight sometime, normally it takes much less time. Check your pieces often and if they look ok, take them out and scrub.

-G
This is exactly what I did with very badly rusted parts, and I checked them often. Took a plastic bristle brush to them every 20 minutes or so. The results were astounding. I can't speak to an entire frame, as I only did hubs, brakes, etc. But the results took less than a couple of hours. If you plan on leaving the frame in overnight, then I agree with those that are saying go with much less of the OA crystals.
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Old 05-11-12, 07:39 AM
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Originally Posted by RosyRambler View Post
How do folks dispose of the used OA solutions?
There was a discussion about this recently (and if I recall there was a variety of different responses ) Anyway, my thought is that one should neutralize it somewhat with soda ash.
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Old 05-11-12, 07:41 AM
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Originally Posted by Grand Bois View Post
Do they do anything to stop rust that is already present or do they just prevent the formation of new rust?
http://www.sandsmachine.com/guide_w.htm
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Old 05-11-12, 07:43 AM
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Originally Posted by clubman View Post
Eureka! Or something remotely similar to that...
Archimedes was the first streaker!
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Old 05-11-12, 08:29 AM
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Originally Posted by RosyRambler View Post
How do folks dispose of the used OA solutions?
baking soda. pour it in until it stops bubbling, then it's ph neutral.
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Old 05-11-12, 08:30 AM
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Originally Posted by skydog6653 View Post
There was a discussion about this recently (and if I recall there was a variety of different responses ) Anyway, my thought is that one should neutralize it somewhat with soda ash.
baking soda. pour it in until it stops bubbling, then it's ph neutral.
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Old 05-13-12, 08:27 PM
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Originally Posted by kingkenobi View Post
baking soda. pour it in until it stops bubbling, then it's ph neutral.
soda ash is more effective and you'll use less
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Old 05-13-12, 08:30 PM
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If you can put a frame or other bike parts into the tank and it doesn't hurt the steel it's not going to hurt your drain pipes or the sewer system. Don't mix it so darn strong, and flush some extra water down the drain when you dump it -or just dump it in the yard. It really is not that big of a deal.
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