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HOW TO ** Remove Anodization **  RSS Feed

#1 2009-02-04 8:40am

deme
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From: Houston, TX
Registered: 2008-03-14
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HOW TO ** Remove Anodization **

So you have faded anno. And you want to remove it here is a step by step on how to do it. I know most people will use oven cleaner but if not watched very carefully it will damage your substrate alloy. So the best way to do it, is how the pro's do it. With Sodium Hydroxide. AKA Lye AKA Caustic Soda. Which happens to be the main ingredient in oven cleaner.
If you have used oven cleaner before and you noticed that your part is splotchy, that's  pitting of the metal from the Glycol ether's in oven cleaner.


http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/anno001.jpg

First you will need a tub large enough to completely submerge the parts I dont suggest metal use a thick plastic polypropylene is the best. I used a oil catch pan.

Now you will need some lye. Home depot or a plumbing supply will have it. You want Dry chemical not a liquid. I suggest Red Devil Drain cleaner. Which can be found at most hardware stores or plumbing supply stores.

My hardware store was out of Red Devil so I used Draino Kitchen Crystals..

I looked over the MSDS and it is 100% sodium hydroxide. Which is perfect for what we need. so if you cant find "Red Devil" look for something similar. must be a solid and 100% sodium hydroxide.

http://www.reckittprofessional.com/find_a_product/images/products/red_devil.jpg
here is the MSDS
http://www.reckittprofessional.com/cust … 0279_r.pdf

Next you need a bucket full of water.

And finally some rubber gloves.

http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/anno001.jpg


OK so you have all of your supplies and we are ready to get our hands dirty.



Fill the tub up with enough water to completely submerge the part you want to strip. Keep track of the water used. ie 2 gallons or 3 gallons.. you get the idea.
http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/anno002.jpg


I would used maybe 1/3 cup lye per gallon of water. But your going to have to play with this a little. Mix well until all chemical is dissolved.

http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/anno003.jpg

your pH will be high (~14pH) so use gloves. I used Nitrile gloves that I have readily available from work.

Make sure you are well ventilated because once the aluminum hits the mixture it will give off gas.

Submerge the parts in the mixture and wait and watch.

If it takes longer than 5 minutes for the mixture to bubble, the solution is a little weak. you can boost it if you like by adding a little caustic (lye) slowly and re dipping the part. Now this stuff is NOT acid so you don't have to worry about splashing up when adding the chemical.

Once it starts bubbling you can pull out the part to check progress. And put it back until you get a uniform raw aluminum color. There should be no splotches (like when using oven cleaner).

You may experience some smut on the part. It will be black in color, almost like soot. this will come off very easy with some 0000 steel wool. You could also use a horse hair brush to remove the smut.

I have noticed the more faded the part the less smut in the stripping process.

part before stripping
http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/anno004.jpg

checking progress
http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/anno005.jpg

looks good now
http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/anno008.jpg

Once all the Anno (dye)  is removed and the part is a uniform color (bare alloy) wash it off with water well and your done.


Here are some of the parts I did.

just entering the solution
http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/anno010.jpg
http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/anno011.jpg

After the solution, a rinse down with water and wiping off with a rag.
http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/anno012.jpg

just out of the solution
http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/anno018.jpg

Once the anno is removed it polishes up nicely. Bottom has had the anno removed and hand polished. Top was just hand polished.
http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/anno023.jpg

I know it sounds complicated but its not just wear gloves and safety glasses.

At my job our tank is 30% by volume caustic. so its a 70 gallon tank 30 gallons of which is caustic. so it works quick.

here are some pics of a sprocket I did at work.

Before stripping
http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/DSCN0415.jpg

We just dipped half of the sprocket. Notice the smut and the dye running off of the part.
http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/DSCN0416.jpg

Just out of the tank. Lots of smut
http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/DSCN0417.jpg

After a quick once over with some 0000 steel wool. (very fine steel wool)
http://i188.photobucket.com/albums/z261/demegod999/bmx/Anno%20removal/DSCN0418.jpg

Disposal

I took my caustic mixture and poured it into my 5 gal bucket of water and poured it down the kitchen sink and then flushed with cold water for a few minutes.

Hope this will help..

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#2 2009-02-04 8:43am

BridgeCity
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Re: HOW TO ** Remove Anodization **

good write-up. there is a sticky on this but maybe this one should replace it, to get my name off the subject.

i've given up on trying to get people to understand the process, they stick to misinformation rather than the science facts and this question gets posed over and over around the various sites.

 

#3 2009-02-04 8:56am

deme
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From: Houston, TX
Registered: 2008-03-14
Posts: 1049
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Re: HOW TO ** Remove Anodization **

BridgeCity wrote:

good write-up. there is a sticky on this but maybe this one should replace it, to get my name off the subject.

I didn't even see that sticky. That a great write-up as well.

BridgeCity wrote:

they stick to misinformation rather than the science facts and this question gets posed over and over around the various sites

very true now that I think about it.

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#4 2009-02-04 9:07am

chromey
Pro MemberObi-Wan Chromey
From: Philadelphia, PA
Registered: 2007-07-19
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Re: HOW TO ** Remove Anodization **

This is Excellent.
Thanks sop much for the in-depth description.

and multiple examples smile


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#5 2009-02-04 9:52am

thegarman
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Registered: 2007-07-02
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Re: HOW TO ** Remove Anodization **

I am sooo trying this...

  Thanks for the tip!

     Gar

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#6 2009-02-04 12:46pm

1966bmx
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From: Toluca Lake , CA
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Posts: 5137
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Re: HOW TO ** Remove Anodization **

awesome now send me that cycle pro seat clamp . kidding . but no really send it to me . .haha no really. i need it ....cool


I used to have a handle on life ...... but it broke ...

If you are under 18 I am sorry . But I will no longer be selling to or buying from you . Too many hassles .

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#7 2009-02-04 12:56pm

deme
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From: Houston, TX
Registered: 2008-03-14
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Re: HOW TO ** Remove Anodization **

1966bmx wrote:

awesome now send me that cycle pro seat clamp . kidding . but no really send it to me . .haha no really. i need it ....cool

let me check when I get home if I have another clamp that will work for me you can have that one.
I'll let ya know

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#8 2009-02-04 6:13pm

Charlie Brown
Pro MemberCB Doom
From: St. Petersburg, FL
Registered: 2007-07-28
Posts: 10940

Re: HOW TO ** Remove Anodization **

Deme, seriously, good post, bro.  VERY informative.  I'm going to do this this weekend! big_smile


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#9 2009-02-04 7:23pm

boxline69
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From: Montgomery, AL
Registered: 2008-02-07
Posts: 3979
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Re: HOW TO ** Remove Anodization **

Oxcylic acid will do the same and will not be as scary! only takes a few minutes,and the anno washes off like dirt! Look at the Chainring in my bikes,the Nora Pro ,it was NOS Gold,


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#10 2009-02-04 7:40pm

deme
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From: Houston, TX
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Re: HOW TO ** Remove Anodization **

boxline69 wrote:

Oxcylic acid will do the same and will not be as scary! only takes a few minutes,and the anno washes off like dirt! Look at the Chainring in my bikes,the Nora Pro ,it was NOS Gold,

Actually OA will also damage the aluminum. You can use it but you do run a risk of damaging your part.
I work at a plating shop we have tanks of both. OA will pit aluminum.
If it worked better Anno shops would be using that instead. They use caustic because it doesn't harm the substrate.

Last edited by deme (2009-02-04 7:44pm)

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#11 2009-02-04 7:52pm

ridingfree
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From: Camino, CA
Registered: 2008-11-07
Posts: 152
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Re: HOW TO ** Remove Anodization **

thanks for that info.....

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#12 2009-02-04 8:39pm

boxline69
Redneck on a Skyway
From: Montgomery, AL
Registered: 2008-02-07
Posts: 3979
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Re: HOW TO ** Remove Anodization **

It doesen't stay in long enough for it to harm it.I use rust-aid and it only has a level consistant to do the work I am refering too.Also I used to work on an Annodizing line and have annoed more parts than I care to remember! cool


You Can't Fix Stupid
Need VDC Changa Fork!! and Monkey Bars!!

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#13 2009-02-05 11:30am

BridgeCity
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Re: HOW TO ** Remove Anodization **

Hi PJ, this is the thread I'm requesting be added to the stickies inplace of my entry that is currently there. thank you.

 

#14 2009-02-05 12:19pm

plymouthfan
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From: Philadelphia, PA
Registered: 2008-10-17
Posts: 728
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Re: HOW TO ** Remove Anodization **

Wish I saw this before I destroyed the surface of my Pro Neck disc and had to end up painting it to cover the pitting that occurred.

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#15 2009-02-06 5:30am

Pa bmx1
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From: Lower Macungie
Registered: 2009-01-22
Posts: 88
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Re: HOW TO ** Remove Anodization **

Tried it yesterday. Worked great & saved me sanding time. I just waited by the side and every minute or 2 hit it with a stiff plastic brush and watched the ano run off.
This pic is after bath and a little 800, not a full polish. This will go on the bike to get me to the park this weekend.
http://img24.imageshack.us/img24/5883/img0961ou0.jpg
http://img24.imageshack.us/img24/img0961ou0.jpg/1/w640.png

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#16 2009-02-06 7:18am

deme
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From: Houston, TX
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Re: HOW TO ** Remove Anodization **

Nice job looks great.

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#17 2009-02-07 3:18pm

D...Nice
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From: Los Angeles, CA
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Re: HOW TO ** Remove Anodization **

cool


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#18 2009-02-08 4:26am

madbunny.
Museum Newbie
Registered: 2009-02-08
Posts: 4

Re: HOW TO ** Remove Anodization **

Hey, sounds like a good thing, i have a 96 supergoose pro 24, i want to get the laquer off so i can polish it up as it looks average and chipped. I'm not sure how to do it as i want to leave the decals on as i'm concerned that i wont be able to get an original decal set for it as i'm in Australia. Any ideas?? Cheers.

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#19 2009-02-10 8:32am

cappy227
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From: Long Island, NY
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Re: HOW TO ** Remove Anodization **

Deme, I did it last night! Worked like a charm...thanks! The smut, though, did stay in the fine grooves of the bare sprocket, though. What's next? Polishing?


"I'll have the roast duck with the mango salsa."

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#20 2009-02-10 9:10am

deme
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From: Houston, TX
Registered: 2008-03-14
Posts: 1049
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Re: HOW TO ** Remove Anodization **

cappy227 wrote:

Deme, I did it last night! Worked like a charm...thanks! The smut, though, did stay in the fine grooves of the bare sprocket, though. What's next? Polishing?

to remove smut. wash the part off with water and use a soft bristle tooth brush it will all come out of the groves.
You can do what ever you want now polish, paint depends on what your looking for..

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#21 2009-02-10 11:18am

hirk
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From: Newbury Park , CA
Registered: 2008-07-18
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Re: HOW TO ** Remove Anodization **

great write up bump


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#22 2009-02-10 1:09pm

zurr
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From: Pennsylvania
Registered: 2008-06-23
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Re: HOW TO ** Remove Anodization **

I buff mine after im done for a "Chrome" like finish, then wax them with mothers mag and aluminum polish.


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Ride to Live!

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#23 2009-02-11 9:37pm

Bmx4Life88
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From: Chicago, IL
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Posts: 202
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Re: HOW TO ** Remove Anodization **

Awesome thread with the knowledge and pictures to back it up.
I'm sold on the process and will pick up some Drano crystals tomorrow.
This will cut down sanding time before polish. sweet smile
thanks/peace,
D


Apply this... "Never for money. Always For Love" Our sport/hobby/world would be so much better. WTB- 03-04 Kappa "Starsky" = Kappa given props to an awesome Old school ride...The Hutch Trickstar. Prov 13:3

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#24 2009-02-13 2:03pm

Duke 01
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From: Greece, Athens
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Re: HOW TO ** Remove Anodization **

Just bought some dry Caustic Soda, will this work??

I didn't find anything like the one you used..


By the way, i have some old black Dia-compe AD990s, is this method gonna work on these??
Next one in black>>

http://img13.imageshack.us/img13/3906/diacompead990zl4.jpg



I tried 2 paint strippers but nothing happened sad


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#25 2009-02-13 2:10pm

deme
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From: Houston, TX
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Re: HOW TO ** Remove Anodization **

Duke 01 wrote:

Just bought some dry Caustic Soda, will this work??

I didn't find anything like the one you used..


By the way, i have some old black Dia-compe AD990s, is this method gonna work on these??
Next one in black>>




I tried 2 paint strippers but nothing happened sad

it will work. As long as they are not painted or powdered. Just follow the directions above. remove any plastic on the parts if possible.

what did you buy that has dry caustic?
If it is just labeled as dry caustic shouldn't have one single problem.

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