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How To Do an Oxalic Acid Bath

#626 2020-08-20 8:50pm

cmb
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Re: How To Do an Oxalic Acid Bath

Post some pictures of what you are working with.


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#627 2020-08-24 7:57pm

83silverstreak
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Re: How To Do an Oxalic Acid Bath

Great work my man! And really nice of you to share with all of us here. It takes time, effort and a good heart to do this. Thanks and I look forward to cleaning up many of my chrome frame and forks.


Stay young, be young, and always best to be on 2 wheels and pedals

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#628 2020-09-06 2:43pm

Nicolaas37
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Re: How To Do an Oxalic Acid Bath

Second OA bath for other Hyper Metro, GT freestyle bars & answer proforx...
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/241399/1905301b-726b-4502-89b0-62794c289b065f5557e0f4.jpeg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/241399/8a4bafca-ec55-49eb-a837-b55ac4203ed05f5557e12f.jpeg
[img]A6DB1D13-E32B-4F44-8E92-262FC04CD95F.jpeg uploading ...[/img]
[img]A1BF0ED6-D21B-42FF-B807-B18659AC36D5.jpeg uploading ...[/img]
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/241399/cc62e095-de5e-4211-acb1-4456aa523f305f5557e183.jpeg
[img]453038A9-9706-414A-B122-1134759873A2.jpeg uploading ...[/img]


WTB: Hyper Hub set- 90’s era... Any Color...
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#629 2020-09-07 8:15am

Nicolaas37
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Re: How To Do an Oxalic Acid Bath

Bars and frame thus far...
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/241399/687d26b7-1532-49e0-8fcc-90a3b64f3f195f564e9055.jpeg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/241399/1bf9a9a8-042c-42e6-870a-ba226add637a5f564e9098.jpeg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/241399/840accf1-07e0-4eba-9c13-7d01b6f779885f564e908f.jpeg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/241399/fa467d4b-be3a-41e4-93a0-de073e2934cc5f564e9094.jpeg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/241399/685a69d5-15d3-4dde-955f-49ab5d8d9f435f564e9094.jpeg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/241399/73817eaa-ff84-4354-8996-62d49b2fe38e5f564e90d1.jpeg


WTB: Hyper Hub set- 90’s era... Any Color...
         1 1/8th Answer proforx- almost any condition...
         95/96 Auburn aluminum triangle must have 990 brake mounts!!!

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#630 2020-09-07 11:16am

Nicolaas37
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Re: How To Do an Oxalic Acid Bath

All done!
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/241399/50074989-09e6-4c8a-8704-b9d53b8fb24c5f5678f652.jpeg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/241399/7078b87a-e2e1-4c78-aaed-cae4c129e8145f5678f66a.jpeg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/241399/59a45bab-5241-447d-82a7-d3bdddd9dea85f5678f66b.jpeg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/241399/c8149b68-43d7-48ce-a945-bb2de5b0f3275f5678f672.jpeg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/241399/0eb886e2-8976-4e0f-92df-ffb9b7a415465f5678f690.jpeg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/241399/db27b281-6373-47be-b90f-48ea5604614e5f5678f698.jpeg


WTB: Hyper Hub set- 90’s era... Any Color...
         1 1/8th Answer proforx- almost any condition...
         95/96 Auburn aluminum triangle must have 990 brake mounts!!!

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#631 2020-09-07 9:33pm

cmb
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Re: How To Do an Oxalic Acid Bath

Very nice!


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#632 2020-09-28 5:20pm

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Re: How To Do an Oxalic Acid Bath

About to do my first bath on a few frames im working on. Does it matter if the parts are touching or stacked? Couldnt find a container bigger than 36 in. and all parts fit well but frames are stacked on each other.

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#633 2020-09-28 5:25pm

Nicolaas37
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Re: How To Do an Oxalic Acid Bath

I don’t foresee a problem, but I haven’t done more than 1 at a time.
I’ve done a frame, forks & 2 sets of bars that touchced... I just checked them every so often and rotated them.9

Last edited by Nicolaas37 (2020-09-28 5:40pm)


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#634 2020-09-28 5:54pm

QueensFinest72
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Re: How To Do an Oxalic Acid Bath

jlowpez7 wrote:

About to do my first bath on a few frames im working on. Does it matter if the parts are touching or stacked? Couldnt find a container bigger than 36 in. and all parts fit well but frames are stacked on each other.

Home Depot has a huge container. Big enough for frame and parts.

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#635 2020-09-28 5:56pm

QueensFinest72
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Re: How To Do an Oxalic Acid Bath

https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/259631/screenshot_20200928-205609_chrome5f728638ac.jpg

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#636 2020-09-28 9:25pm

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Re: How To Do an Oxalic Acid Bath

I haven't had any luck with oxalic acid baths, so maybe I got some bum crystals or I've never gotten the water to oxalic acid ratio right.

My method for rust removal from chrome-plated steel is to first use an SOS pad (which is just 0000 steel wool with soap added to it). 0000 steel wool won't scratch chrome, no matter how hard you scrub. This will remove all the light rust, i.e., rust that hasn't actually caused noticeable pieces of chrome to disappear yet.

For more stubborn rust, if it's feasible to soak it in white vinegar, that's what I do. After several hours, it will come off easily with an SOS pad or a brass-bristle brush (which doesn't scratch chrome either). The acetic acid in vinegar has the exact same effect on rust as oxalic acid (or citric or phosphoric acid, for that matter), but if I could get oxalic acid to work I'd rather do that because vinegar gets expensive if you want to soak a whole frame, while it seems that oxalic acid crystals only require a few teaspoons, which is way cheaper.

If it's just a small spot here or there that's too stubborn to remove with an SOS pad and it's something that's too big to easily soak, I'll use Bar Keepers Friend powder mixed with water and scrub it with a toothbrush. That takes patience though, maybe 15 minutes or more of scrubbing the same spot. BKF is just oxalic acid and a mild abrasive (about as abrasive as talc; doesn't even come close to scratching chrome; it's nothing like the harsh abrasives in e.g. Comet or Ajax cleaning powders).

I saw a video where someone wrapped a vinegar-soaked paper towel around the rust spot, then wrapped that with Saran wrap to keep it from drying out, and left it overnight. I might give that a try next time, because if that works it beats scrubbing one spot with BKF for 15+ minutes.

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#637 2020-09-28 11:45pm

cmb
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Re: How To Do an Oxalic Acid Bath

MaximRecoil wrote:

I haven't had any luck with oxalic acid baths, so maybe I got some bum crystals or I've never gotten the water to oxalic acid ratio right.

My method for rust removal from chrome-plated steel...SOS pad...white vinegar bath...vinegar-soaked paper towel..

This is literally my first paragraph

Ok, first things first.  This is an Oxalic Acid bath "how to"  post.  This isn't an "Oxalic Acid-is-the-best-way-to-remove-rust-and-all-the-other-ways-suck"  post.  I know there are other ways to remove rust from parts. Citric Acid and Vinegar baths are the other two popular ways that have been documented in the museum.  There are others as well.  If those work for you, great!  I'm not disparaging any other ways to remove rust.  As previously stated, I am merely documenting how to do an Oxalic Acid (OA) bath. So, I am asking up front to not comment on any other ways to remove rust in this thread.

Last edited by cmb (2020-09-28 11:51pm)


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#638 2020-09-29 12:21am

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Re: How To Do an Oxalic Acid Bath

cmb wrote:

This is literally my first paragraph

Ok, first things first.  This is an Oxalic Acid bath "how to"  post.  This isn't an "Oxalic Acid-is-the-best-way-to-remove-rust-and-all-the-other-ways-suck"  post.  I know there are other ways to remove rust from parts. Citric Acid and Vinegar baths are the other two popular ways that have been documented in the museum.  There are others as well.  If those work for you, great!  I'm not disparaging any other ways to remove rust.  As previously stated, I am merely documenting how to do an Oxalic Acid (OA) bath. So, I am asking up front to not comment on any other ways to remove rust in this thread.

This is the rest of what you said:

So, I am asking up front to not comment on any other ways to remove rust in this thread.  If you do, I will instantly make fun of you and your bike(s).

And I'm okay with that.

By the way, until I can get some oxalic acid crystals that actually work (or fix whatever the problem is), the methods I use do involve oxalic acid:

MaximRecoil wrote:

BKF is just oxalic acid and a mild abrasive

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#639 2020-09-29 5:37am

cmb
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Re: How To Do an Oxalic Acid Bath

You don’t have any bikes listed for me to make fun of! lol tongue

Is there a brand name for the OA crystals you used?


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#640 2020-09-29 8:27am

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Re: How To Do an Oxalic Acid Bath

cmb wrote:

You don’t have any bikes listed for me to make fun of! lol tongue

lol

Is there a brand name for the OA crystals you used?

No, it came in a big plastic bag with a generic label on it. Here's a picture of it:

https://imgur.com/a/R7VdbTJ

I bought it online quite a few years ago, and I've tried it several times on various things and I can't get it to work. I've tried small doses of it like in your instructions and big doses, like a quarter cup of it to a few gallons of water. It seems to do something; I see little bubbles that attach to the rust (though maybe that would happen in just plain water too), but I've never seen the yellow substance you mentioned and I've never smelled anything at all coming from the solution, let alone sulfur. After letting the rusty part soak for up to a day, the rust is still there and doesn't come off any easier than before I soaked it.

Vinegar, which is just a premixed solution of 1 part acetic acid to 20 parts water, works great, but the problem is the expense of buying ~16 gallons of it to give a whole frame a bath. Oxalic acid is much stronger than acetic acid, so it shouldn't take much of it for a whole frame, which is why I'd like to get the OA bath method working.

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#641 2020-09-30 7:40pm

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Re: How To Do an Oxalic Acid Bath

Ur a stud

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#642 2020-10-15 4:10am

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Re: How To Do an Oxalic Acid Bath

Now that I have magically cleaned two chrome framesets ('82 Predator & '96 Group 1 Si), any thoughts on how I should dispose of this tub of Acid that I have???  I apologize if this was mentioned somewhere in the 26 pages of this thread.

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#643 2020-10-16 4:37pm

cmb
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Re: How To Do an Oxalic Acid Bath

I just pour it on the grass.  I doesn’t hurt it.

Some people suggest adding some baking soda to neutralize the acid before dumping it in the yard.

Last edited by cmb (2020-10-16 4:39pm)


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#644 2020-10-18 5:40pm

NoJuice01
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Re: How To Do an Oxalic Acid Bath

I read this whole thing and was hoping to see some non-chrome frames in an OA bath with before and after photos.

If there were some early in the thread, the photos are now gone.

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#645 2020-10-19 11:45am

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Re: How To Do an Oxalic Acid Bath

cmb wrote:

I just pour it on the grass.  I doesn’t hurt it.

Some people suggest adding some baking soda to neutralize the acid before dumping it in the yard.

Thanks, we've got a dog that finds her nose in everything, I was worried about her getting into it.  Maybe I'll find that skunk hole in my backyard....

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#646 2020-10-19 12:46pm

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Re: How To Do an Oxalic Acid Bath

Pour it on hydrangeas or azaleas.  They love it.

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#647 2020-12-22 10:42pm

Jvex99
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Re: How To Do an Oxalic Acid Bath

Fantastic write up. I am amazed by the results. So many bikes can be saved and restored. Thanks for the information.

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#648 2020-12-30 10:45am

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Re: How To Do an Oxalic Acid Bath

Great read. Any guidelines to doing this in 30-40 degree temps?


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#649 2021-01-01 3:19pm

cmb
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Re: How To Do an Oxalic Acid Bath

It will be a much slower process.  You could start with really hot water.  I’ve used a lamp to keep the water from getting too cold.  I used the lid to cover about 80% of the opening and I placed it on plywood to keep it off the concrete floor.

I’ve thought about getting an aquarium heater, but it doesn’t stay cold for too long here in Texas.

Last edited by cmb (2021-01-01 3:20pm)


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#650 2021-01-12 7:24pm

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Re: How To Do an Oxalic Acid Bath

cmb wrote:

It will be a much slower process.  You could start with really hot water.  I’ve used a lamp to keep the water from getting too cold.  I used the lid to cover about 80% of the opening and I placed it on plywood to keep it off the concrete floor.

I’ve thought about getting an aquarium heater, but it doesn’t stay cold for too long here in Texas.

Thank you sir!


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