Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

removing anodizing

Old 03-29-16, 01:15 PM
  #1  
T Stew
Senior Member
Thread Starter
 
T Stew's Avatar
 
Join Date: Jun 2012
Location: Central Ohio
Posts: 865

Bikes: All 80s Schwinns: 88Prologue, 88Circuit, 88Ontare, 88KOM, 86SS, 88Tempo, 88V'ger, 80V'ger, 88LeTour, 82LTLuxeMixte, 87 Cimarron, 86H.Sierra, 92Paramount9c

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 186 Post(s)
Liked 0 Times in 0 Posts
removing anodizing

I couldn't get the chainring I wanted for one of my projects in silver and ended up having to get black. I was going to live with it black but wondered if I could sand the anodizing off or use some kind of chemical and how hard that would be. I'd imagine bare aluminum would need polished every so often to keep looking nice, but on a classic build I'd much rather have a silver look to match the rest of the silver components. Will be going on a DA7800 (silver) crank upgrade for my '88 Tempo.
T Stew is offline  
Old 03-29-16, 01:36 PM
  #2  
techsensei
Senior Member
 
Join Date: Aug 2013
Posts: 767
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
You'd be better off painting it silver than trying to remove the anodized surface.
techsensei is offline  
Old 03-29-16, 01:58 PM
  #3  
Kopsis
Senior Member
 
Kopsis's Avatar
 
Join Date: Apr 2008
Location: St. Pete, Florida
Posts: 1,260
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 83 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Some types of oven cleaner will strip anodizing. Other cleaning products containing oxylic acid (like Barkeepers Friend) will also work, but may require a huge amount of effort. If your time has any value at all, you'll be better off just buying silver chainrings.

Also note that even if you are successful, you'll be left with a bare aluminum surface that, even if polished, will tend to develop a cloudy, blotchy appearance as it oxidizes and passivates. It's unlikely to match the appearance of the clear anodized silver parts on your bike for very long.
Kopsis is offline  
Old 03-29-16, 07:15 PM
  #4  
tacoman1423
Junior Member
 
Join Date: Jul 2013
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Concentrated grill cleaner will work
tacoman1423 is offline  
Old 03-29-16, 07:21 PM
  #5  
brianmcg123
Senior Member
 
brianmcg123's Avatar
 
Join Date: Oct 2002
Location: TN
Posts: 1,229
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 326 Post(s)
Liked 6 Times in 4 Posts
Easy-Off oven cleaner. Spay on and let sit and bubble for half an hour. Do it outside as the fumes are toxic.

You will probably need to repeat it a few times to get it all off. But then once its off, you will have to polish the surface really well to remove any imperfections.

I did a stem once that was anodized black. Once I was finished with the oven cleaner, the stem had lots of imperfections in it that would not buff out. Anodizing covers lots of blemishes. I still use the stem today on my touring bike though.

Have fun.
brianmcg123 is offline  
Old 03-30-16, 06:06 AM
  #6  
Moe Zhoost
Half way there
 
Moe Zhoost's Avatar
 
Join Date: Sep 2015
Location: Durham, NC
Posts: 1,297

Bikes: Many, and the list changes frequently

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 342 Post(s)
Liked 44 Times in 29 Posts
I've used a dilute solution of alkaline drain cleaner. The metal will turn black as the anodizing is eaten away. This washes off, but then you are in for a bunch of polishing. A good job for a rainy saturday.
Moe Zhoost is offline  
Old 03-30-16, 06:25 AM
  #7  
T Stew
Senior Member
Thread Starter
 
T Stew's Avatar
 
Join Date: Jun 2012
Location: Central Ohio
Posts: 865

Bikes: All 80s Schwinns: 88Prologue, 88Circuit, 88Ontare, 88KOM, 86SS, 88Tempo, 88V'ger, 80V'ger, 88LeTour, 82LTLuxeMixte, 87 Cimarron, 86H.Sierra, 92Paramount9c

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 186 Post(s)
Liked 0 Times in 0 Posts
Thanks for the responses - sounds like a lot of work for sure and definitly something I'd only do if I had a lot of spare time, so likely won't happen but I'll keep these methods in mind.

Originally Posted by Kopsis View Post
If your time has any value at all, you'll be better off just buying silver chainrings.
I'd buy silver ones in a heartbeat - but like I said I was unable to find any. I admit I probably should have asked the forums help finding a silver one first though, someone might know something that I hadn't found yet. 130 BCD ~50t (or slightly less) narrow-wide chainring (10 speed compatible, for 10x1 road experiment) is what I am after.
T Stew is offline  
Old 03-30-16, 06:48 AM
  #8  
blakcloud 
Senior Member
 
blakcloud's Avatar
 
Join Date: Aug 2007
Location: Toronto, Ontario
Posts: 1,904

Bikes: Rivendell Sam Hillborne, Brompton S/M3L (modified), custom Winter Cycles

Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 311 Post(s)
Liked 11 Times in 6 Posts
Stripping anodizing is easy with drain cleaner. I have done stems and cranks and it was no work at all. Never tried a chainring but would like to just to see how it would work out. Maybe I was lucky as I started with good quality parts, White Industries ENO cranks and Cinelli stem and they buffed to a beautiful shine.
blakcloud is offline  
Old 03-30-16, 07:30 AM
  #9  
1989Pre
Standard Member
 
Join Date: Apr 2009
Location: Brunswick, Maine
Posts: 2,732

Bikes: 2001 Raleigh M80, 1989 Raleigh Technium, 1983 F. Moser Sprint, 1963 Freddie Grubb Routier, 1948 P. Barnard & Son

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 692 Post(s)
Liked 0 Times in 0 Posts
Stronglight Dural 130mm Shimano 8/9/10 Chainring - Chainrings - Ribble Cycles

http://www.ribblecycles.co.uk/strong...-10-chainring/

Last edited by 1989Pre; 03-30-16 at 07:39 AM.
1989Pre is offline  
Old 03-30-16, 07:36 AM
  #10  
T Stew
Senior Member
Thread Starter
 
T Stew's Avatar
 
Join Date: Jun 2012
Location: Central Ohio
Posts: 865

Bikes: All 80s Schwinns: 88Prologue, 88Circuit, 88Ontare, 88KOM, 86SS, 88Tempo, 88V'ger, 80V'ger, 88LeTour, 82LTLuxeMixte, 87 Cimarron, 86H.Sierra, 92Paramount9c

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 186 Post(s)
Liked 0 Times in 0 Posts
That does not appear to be a narrow-wide chainring at all.
T Stew is offline  
Old 03-30-16, 07:47 AM
  #11  
Kopsis
Senior Member
 
Kopsis's Avatar
 
Join Date: Apr 2008
Location: St. Pete, Florida
Posts: 1,260
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 83 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by T Stew View Post
I'd buy silver ones in a heartbeat - but like I said I was unable to find any. I admit I probably should have asked the forums help finding a silver one first though, someone might know something that I hadn't found yet. 130 BCD ~50t (or slightly less) narrow-wide chainring (10 speed compatible, for 10x1 road experiment) is what I am after.
Ah ... for NW you're probably out of luck on silver ano. Even in black, 50t NW is scarce. If you want to do this right, find an industrial anodizing shop that will do walk-in piece-part work. They can strip off the black ano and apply sliver/clear. It may cost a bit, but you won't risk screwing up the metallurgy with caustic chemicals.

Note that drain cleaner (a.k.a. lye, a.k.a. sodium hydroxide) will strip not only the oxide, but will also eat away at the aluminum itself. If there's any surface treatment on the chainring you risk losing it. Even if there isn't, you'll get lots of irregular surface pitting and erosion. Probably doesn't matter on something as robust as a stem or seatpost, but on tiny little chainring teeth that are under massive loads it "feels" risky.
Kopsis is offline  
Old 03-30-16, 08:35 AM
  #12  
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 10,803

Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 661 Post(s)
Liked 25 Times in 22 Posts
About 25 years ago, I anodized a limited amount of small parts. (Black)
If I had one that didn't turn out well, it went into a Nitric Acid dip for a few seconds to strip the black.
These were small parts that fit in a beaker. Think of 1" diameter cassette lock rings for a similarity.
Bill Kapaun is online now  
Old 03-30-16, 08:41 AM
  #13  
DrIsotope
Non omnino gravis
 
DrIsotope's Avatar
 
Join Date: Feb 2015
Location: SoCal, USA!
Posts: 6,723

Bikes: Nekobasu, Pandicorn

Mentioned: 99 Post(s)
Tagged: 0 Thread(s)
Quoted: 3579 Post(s)
Liked 149 Times in 113 Posts
Depending on how deep the coloring is in the anno, you can often bake the color out. I've done it many, many times with aluminum parts of all colors. Try baking the chainring at a high temp (~450) in a toaster oven for an hour or so. If the anno isn't deep, it will go to clear, if it is, it will end a sort of titanium/gunmetal color. If it ends the titanium color, you can always strip it afterward to get to the bare aluminum. Just know that the bare aluminum surface begins to oxidize immediately, so unless you like dull gray, the polishing process is never ending.
__________________
DrIsotope is offline  
Old 03-30-16, 09:31 AM
  #14  
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 10,803

Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 661 Post(s)
Liked 25 Times in 22 Posts
Originally Posted by DrIsotope View Post
Depending on how deep the coloring is in the anno, you can often bake the color out. I've done it many, many times with aluminum parts of all colors. Try baking the chainring at a high temp (~450) in a toaster oven for an hour or so. If the anno isn't deep, it will go to clear, if it is, it will end a sort of titanium/gunmetal color. If it ends the titanium color, you can always strip it afterward to get to the bare aluminum. Just know that the bare aluminum surface begins to oxidize immediately, so unless you like dull gray, the polishing process is never ending.
And what does that do to the properties of the aluminum?
Aluminum Workshop: Achieving T6 designation for 6061 - TheFabricator.com

"....So we have a solid solution of magnesium, silicon, and other elements in aluminum at room temperature. This is called the T4 temper. If we take this material and heat treat it at a temperature between 325 and 400 degrees F, the alloying elements begin to form ordered arrays of atoms in the aluminum matrix. These arrays are called GP zones, and they strengthen the aluminum considerably. This heat treatment is called aging, which results in material with a T6 temper...."
Bill Kapaun is online now  
Old 03-30-16, 09:33 AM
  #15  
SonsBikes
SonsBikes
 
SonsBikes's Avatar
 
Join Date: Jan 2015
Location: Grand Rapids, MI
Posts: 23

Bikes: Pinarello Sestriere, Fuji Royale, Club Fuji, Team Fuji, Vitus 979, Bianchi Limited

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I've noticed that Evaporust takes anodizing off of some surfaces and leaves a bare metal finish.
SonsBikes is offline  
Old 03-30-16, 09:36 AM
  #16  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,928

Bikes: 8

Mentioned: 188 Post(s)
Tagged: 0 Thread(s)
Quoted: 6833 Post(s)
Likes: 0
Liked 211 Times in 176 Posts
TA makes Beautiful polished silver chainrings , you just dont look far enough . (or are willing to spend enough)

Lots of other 130 BCD chainrings are made by 3rd party suppliers .. Anodized with out adding a Color.
fietsbob is offline  
Old 03-30-16, 12:58 PM
  #17  
1989Pre
Standard Member
 
Join Date: Apr 2009
Location: Brunswick, Maine
Posts: 2,732

Bikes: 2001 Raleigh M80, 1989 Raleigh Technium, 1983 F. Moser Sprint, 1963 Freddie Grubb Routier, 1948 P. Barnard & Son

Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 692 Post(s)
Liked 0 Times in 0 Posts
Originally Posted by T Stew View Post
That does not appear to be a narrow-wide chainring at all.
You are right, T S. I replied without reading all the comments by O.P.
1989Pre is offline  
Old 03-30-16, 01:24 PM
  #18  
T Stew
Senior Member
Thread Starter
 
T Stew's Avatar
 
Join Date: Jun 2012
Location: Central Ohio
Posts: 865

Bikes: All 80s Schwinns: 88Prologue, 88Circuit, 88Ontare, 88KOM, 86SS, 88Tempo, 88V'ger, 80V'ger, 88LeTour, 82LTLuxeMixte, 87 Cimarron, 86H.Sierra, 92Paramount9c

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 186 Post(s)
Liked 0 Times in 0 Posts
No prob 1989, looks like fietsbob did the same thing.

I'm thinking staying black is more appealing then ever now! But I appreciate all the science and methods

I did ask WolfTooth if they would ever make thier Drop Stop chainring in silver in that size, and they said they had no plans to.
T Stew is offline  
Old 03-30-16, 02:28 PM
  #19  
SloButWide 
Heck on Wheels
 
SloButWide's Avatar
 
Join Date: Sep 2015
Location: USA Midwest
Posts: 1,111

Bikes: In Signature

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 206 Post(s)
Likes: 0
Liked 1 Time in 1 Post
This instructable claims that "Greased Lightning Cleaner" will do the trick. MSDS here - looks like it's a Sodium Hydroxide based cleaner, like oven & grill cleaners.
__________________
"I had a great ride this morning, except for that part about winding up at work."

Bikes so far: 2011 Felt Z85, 80's Raleigh Sovereign (USA), 91 Bianchi Peregrine, 91 Austro-Daimler Pathfinder, 90's Trek 730 Multitrack, STOLEN: 80 Schwinn Voyageur (Japan)

SloButWide is offline  
Old 03-30-16, 09:45 PM
  #20  
Jeff Wills
Insane Bicycle Mechanic
 
Jeff Wills's Avatar
 
Join Date: Mar 2008
Location: other Vancouver
Posts: 8,957
Mentioned: 26 Post(s)
Tagged: 0 Thread(s)
Quoted: 425 Post(s)
Liked 17 Times in 13 Posts
Originally Posted by Kopsis View Post
Ah ... for NW you're probably out of luck on silver ano. Even in black, 50t NW is scarce. If you want to do this right, find an industrial anodizing shop that will do walk-in piece-part work. They can strip off the black ano and apply sliver/clear. It may cost a bit, but you won't risk screwing up the metallurgy with caustic chemicals.
I just did that with a couple black aluminum fenders that I really wanted silver. They came out great, but it was a pricey proposition.
__________________
Jeff Wills

Comcast nuked my web page. It will return soon..
Jeff Wills is offline  
Old 03-31-16, 09:50 AM
  #21  
vettracer
Senior Member
 
Join Date: Jan 2011
Posts: 209
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
[QUOTE=T Stew; someone might know something that I hadn't found yet. 130 BCD ~50t (or slightly less) narrow-wide chainring (10 speed compatible, for 10x1 road experiment) is what I am after.[/QUOTE]

I thought Wolf Tooth would make it, but interestingly, they make a 52T in 130 bcd, but not a 50T. In 110 BCD they do make a 50T, but I assume that you already have the 130 BCD crankset.

130 BCD Road / Cyclocross Chainrings ? wolftoothcomponents.com
vettracer is offline  
Old 03-31-16, 12:39 PM
  #22  
T Stew
Senior Member
Thread Starter
 
T Stew's Avatar
 
Join Date: Jun 2012
Location: Central Ohio
Posts: 865

Bikes: All 80s Schwinns: 88Prologue, 88Circuit, 88Ontare, 88KOM, 86SS, 88Tempo, 88V'ger, 80V'ger, 88LeTour, 82LTLuxeMixte, 87 Cimarron, 86H.Sierra, 92Paramount9c

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 186 Post(s)
Liked 0 Times in 0 Posts
Well, not that it changes much but I was mistaken. The 50t is the one I am keeping black (I have two narrow-wide chainring projects), the one I'd prefer silver is 44t though I'd rather have something between the two in silver.

Here is what I got for my 1x10 projects:



The black on the 7800 crankset doesn't look to bad I guess. I'll wait for final judgment when it's all done and on my '88 Tempo but I don't think trying to DIY silver or having it done pro will be worth the hassle or cost.

Originally Posted by vettracer View Post
I thought Wolf Tooth would make it, but interestingly, they make a 52T in 130 bcd, but not a 50T.
I'd even do the 52t if they made it in silver, but the whole point of this is that they don't come in silver, in any road-ish size.

Last edited by T Stew; 03-31-16 at 12:49 PM.
T Stew is offline  
Old 04-02-16, 01:51 PM
  #23  
Camilo
Senior Member
 
Join Date: Apr 2007
Posts: 4,537
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 228 Post(s)
Liked 9 Times in 7 Posts
Originally Posted by SloButWide View Post
This instructable claims that "Greased Lightning Cleaner" will do the trick. MSDS here - looks like it's a Sodium Hydroxide based cleaner, like oven & grill cleaners.
I used Greased Lightening to strip the anodizing off two Shimano chain wheels, and it worked well. It definitely wasn't much of a hassle and I'm glad I did it. They were gray anodized, not black, but being Shimano I'm pretty sure it was good, tough anodizing so will probably be comparable to your black.

My opinion: do it - shiny silver will look better with the Dura Ace crank and I think you'll find it's not that hard to get it shiny silver.

I can't remember the exact procedure, but I just found it on the web (maybe even YouTube), and just followed the common directions people posted.

[edit] just looked at the above link, and that's probably the method I used.

I had to buy a gallon of the stuff (that's all they had at the Home Depot or wherever I found it locally... it wasn't expensive enough for me to justify looking around town for a smaller quantity). I used maybe a quart. According to the label, I will probably find another use for it sometime.

I followed that with polishing with metal polish I have on hand. I happen to have a buffing wheel (be careful or those teeth!), but you could hand polish it too. It looks great. Much better with the all shiny silver parts on a vintage bike.

Last edited by Camilo; 04-02-16 at 03:08 PM.
Camilo is offline  
Old 04-02-16, 02:12 PM
  #24  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,928

Bikes: 8

Mentioned: 188 Post(s)
Tagged: 0 Thread(s)
Quoted: 6833 Post(s)
Likes: 0
Liked 211 Times in 176 Posts
Polish it off .
fietsbob is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Smitty19
Bicycle Mechanics
19
09-01-17 12:03 PM
lemondzurich
Framebuilders
8
03-02-14 03:29 PM
R900
"The 33"-Road Bike Racing
6
03-22-09 12:28 PM
Rev.Chuck
General Cycling Discussion
64
02-24-06 01:18 AM
BiKe_GuY666
BMX
5
07-09-04 11:32 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.