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How Much Oxalic Acid?

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Old 08-03-12, 05:37 PM
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How Much Oxalic Acid?

Hello Comrades;

I'm going to use Oxalic Acid for the first time to remove rust. I have an old bike that has just about everything but the frame rusted--bars, rims, crank--everything. The directions on the OA say to mix the whole container in water, but that seems like a lot. What solution/proportion do you use?

Thanks
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Old 08-03-12, 05:40 PM
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Not enough info buddy. There's lab quality concentrated OA and there's taxidermists OA and there's diluted deck bleach and many opinions and experience to go with each.

Use the site search engine for more information than you really want or need.
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Old 08-03-12, 06:02 PM
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I don't know about Taxidermist OA, but the OA powder you buy at the Sherwin Williams store (sold as generic "Wood Bleach) creates a potent enough solution for rust removal with just about a tablespoon per gallon of water. It's better to soak longer than to use too strong a solution.

When I am done with it, I neutralize it with household baking powder.

As always read the label and pay heed to the warnings.
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Old 08-03-12, 06:03 PM
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Originally Posted by clubman View Post
Not enough info buddy. There's lab quality concentrated OA and there's taxidermists OA and there's diluted deck bleach and many opinions and experience to go with each.

Use the site search engine for more information than you really want or need.
+1 What are you using?

Best/easiest is the pure Savogran stuff from Ace Hardware. It's pretty easy to use.
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Old 08-03-12, 06:24 PM
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Originally Posted by Amesja View Post
+1 What are you using?

Best/easiest is the pure Savogran stuff from Ace Hardware. It's pretty easy to use.
That's exactly what it is, the Savogran from Ace. I'll try it in a solution one of the above posters recommended and see how that works. Thanks for the input.
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Old 08-03-12, 06:25 PM
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Originally Posted by auchencrow View Post
I don't know about Taxidermist OA, but the OA powder you buy at the Sherwin Williams store (sold as generic "Wood Bleach) creates a potent enough solution for rust removal with just about a tablespoon per gallon of water. It's better to soak longer than to use too strong a solution.

When I am done with it, I neutralize it with household baking powder.

As always read the label and pay heed to the warnings.

Good advice. Thanks.
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Old 08-03-12, 06:26 PM
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Originally Posted by clubman View Post
Not enough info buddy. There's lab quality concentrated OA and there's taxidermists OA and there's diluted deck bleach and many opinions and experience to go with each.

Use the site search engine for more information than you really want or need.
I'll try the search engine now. Thanks!
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Old 08-03-12, 07:18 PM
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Originally Posted by Sprayman View Post
I'll try the search engine now. Thanks!
Unless they fixed the search function, better off to search via google:

oxalic acid site:www.bikeforums.net
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Old 08-03-12, 08:18 PM
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Originally Posted by Amesja View Post
+1 What are you using?

Best/easiest is the pure Savogran stuff from Ace Hardware. It's pretty easy to use.
I use a tech grade from a chemical distributions store and pay top dollar...$2 per 100ml. But that 2 dollars will do a bike or 2
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Old 08-04-12, 12:37 AM
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Unless they fixed the search function, better off to search via google:
+1. I have come around to doing that more often than using the local search engine. I am not aiming or blaming. It's just the way it is. Don't want to hijack the thread, but the OP is better advised. Google is usually faster than trawling through what the local engine throws up.
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Old 08-04-12, 07:11 AM
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Originally Posted by Lenton58 View Post
+1. I have come around to doing that more often than using the local search engine. I am not aiming or blaming. It's just the way it is. Don't want to hijack the thread, but the OP is better advised. Google is usually faster than trawling through what the local engine throws up.

+10

The search function on this site is unusable. Not only does it stink to high heaven but you are locked out from searching more than once every 30 seconds or something ridiculous like that which makes it ABSOLUTELY WORTHLESS.

Use google

Type in this command before your search terms into the google box (with a space after the command and before your search terms):

site:www.bikeforums.net

So a search for Oxalic Acid would look like this in the google bar:

site:www.bikeforums.net oxalic acid

This technique works on ANY website that google can categorize (not blocked out from searching)
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Old 08-04-12, 10:28 AM
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Forget the marketing hype, and just buy the pure powder form of OA from any respectable hardware store. It will cost you less than $10 and last you for a lot of projects. Typically, I use it at 1:1000 w/v dilution in water. That is to say, weight per volume, or 1g of OA powder to 1L of water. That's not very concentrated, but you don't want it very concentrated, anyway. Too concentrated and it will leave a yellowish layer on the surface of the item you're treating, and it's hard to sand off. I usually let my 1:1000 solution work overnight, with occasional scrubbing of the item if the rust is pretty bad. Remember that OA won't remove pitting, it only removes the rust. Pitted chrome will remain pitted chrome after treatment.
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Old 08-04-12, 11:10 AM
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Originally Posted by auchencrow View Post

When I am done with it, I neutralize it with household baking powder.

As always read the label and pay heed to the warnings.
How do you use the baking powder? Do you mix up a paste and smear it on the soaked parts?
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Old 08-07-12, 11:19 AM
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Originally Posted by wrk101 View Post
Unless they fixed the search function, better off to search via google:

oxalic acid site:www.bikeforums.net
+1. IMHO none of the forum software out there has a search facility worth a damn. Just use Google as shown above. Easy, peasy...

Skip
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Old 08-07-12, 11:28 AM
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I think you need baking soda not baking powder. I never measure the baking soda but just put 3 or 4 tablespoons per litre of water and put the part in for a few minutes. I rinse thoroughly with water and then dry.
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Old 08-07-12, 11:30 AM
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The problem with forum-based search functionality is that is often targeted by haXorz to bring down a website using DoS attacks and many repetitive search requests filed until the system is overloaded and crashes. Thus the silly once/30 seconds limits on everyone (even long-time members.)

Just do Google and be done with it.
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Old 08-07-12, 12:06 PM
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Old 08-07-12, 01:17 PM
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Originally Posted by Sprayman View Post
How do you use the baking powder? Do you mix up a paste and smear it on the soaked parts?
The baking SODA (I misspoke when I called it "powder") is used to neutralize the OA solution. Add it bit by bit, slowly - it fizzes up and once the acid is neutralized it stops fizzing.
I flush the parts with clean water and treat them immediately so they don't rust again, and depending on what I am doing, the rust inhibitor might be frame saver, clear coat, touch-up, oil, car wax or whatever.
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