Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 06-17-10, 08:44 PM   #1
Stanger
Senior Member
Thread Starter
 
Join Date: Jun 2009
Bikes:
Posts: 170
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
De-rusting assemblies of steel and aluminum

What is the best way to remove rust from an item such as a derailleur which has both steel and aluminum components? I've read that OA is not good for aluminum and the same for vinegar. This part definitely needs a full soak in something that won't harm the aluminum but will take the rust. It is a 600 arabesque front derailleur and the aluminum items are pinned to the steel, no removing them I'm afraid.
Stanger is offline   Reply With Quote
Old 06-17-10, 09:36 PM   #2
dbakl
Senior Member
 
Join Date: Nov 2005
Bikes: Cinelli, Paramount, Raleigh, Carlton, Zeus, Gemniani, Frejus, Legnano, Pinarello, Falcon
Posts: 5,775
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I haven't had any problems throwing aluminum into OA. Clouds it up but comes right off on a wire wheel.
dbakl is offline   Reply With Quote
Old 06-18-10, 02:44 AM   #3
khatfull
FBoD Member at Large
 
khatfull's Avatar
 
Join Date: Aug 2008
Location: Woodbury, MN
Bikes:
Posts: 6,188
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yeah, as long as you don't leave it in for days in a very strong solution you might have to repolish the aluminum but it shouldn't be damaged.
khatfull is offline   Reply With Quote
Old 06-18-10, 05:24 AM   #4
wrk101
DRF aka Thrifty Bill
 
wrk101's Avatar
 
Join Date: Jan 2008
Location: The NC Mountains
Bikes: 86 Katakura Silk, 87 Prologue, 87 Cimarron, 14 frame school custom, 73 Paramount
Posts: 19,965
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Vinegar is the common name for acetic acid. Acids and aluminum do not pay well together. So go dilute, and not for too long.
wrk101 is offline   Reply With Quote
Old 06-18-10, 06:40 AM   #5
Drakonchik
Senior Member
 
Drakonchik's Avatar
 
Join Date: Dec 2005
Location: Pacific Northwest
Bikes:
Posts: 733
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Gel type rust remover from auto supply store. Syringe from craft store. Use syringe to apply gel precisely where needed. No soaking, little waiting, rinse with lots of cold water and you're done.
Drakonchik is offline   Reply With Quote
Old 06-18-10, 06:47 AM   #6
khatfull
FBoD Member at Large
 
khatfull's Avatar
 
Join Date: Aug 2008
Location: Woodbury, MN
Bikes:
Posts: 6,188
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Drakonchik View Post
Gel type rust remover from auto supply store. Syringe from craft store. Use syringe to apply gel precisely where needed. No soaking, little waiting, rinse with lots of cold water and you're done.
I've kinda done that too with a stronger OA solution...just brush it on carefully but the gel is a good idea. Wonder if you could somehow gel the OA solution?
khatfull is offline   Reply With Quote
Old 06-18-10, 07:55 AM   #7
scarlson
Junior Member
 
Join Date: Jun 2010
Bikes:
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Restoring cars, we always use phosphoric acid to remove rust. While we get it in gallon jugs from NAPA, you can get a weaker solution from your local supermarket, in the form of Coca Cola. You just soak whatever in the Coke for a few days and the rust should be a lot easier to brush off after.
scarlson is offline   Reply With Quote
Old 06-18-10, 08:20 AM   #8
Stanger
Senior Member
Thread Starter
 
Join Date: Jun 2009
Bikes:
Posts: 170
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks guys. It looks like a small bit of the aluminum slipped into the solution last night anyway. It just seems to have brightened it a bit which is ok by me. The rest is soaking now.

Scarlson, good to see a fellow car restorer here! I use phosphoric acid quite a bit as well, but I must say that I've been very impressed with this oxalic acid. I'm trying to figure out why we car guys don't use it more! And thanks for the tip on the coke. I always dilute the strong stuff, but having that trick in my bag could be useful.
Stanger is offline   Reply With Quote
Old 06-18-10, 11:41 AM   #9
scarlson
Junior Member
 
Join Date: Jun 2010
Bikes:
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Stanger View Post
Scarlson, good to see a fellow car restorer here! I use phosphoric acid quite a bit as well, but I must say that I've been very impressed with this oxalic acid. I'm trying to figure out why we car guys don't use it more! And thanks for the tip on the coke. I always dilute the strong stuff, but having that trick in my bag could be useful.
Likewise, good to see a fellow car restorer here. I'm currently working on a '65 Lotus Elan, so I've had to learn to fiberglass in addition to stripping rust from the inside of chassis box-sections. I've never used oxalic acid before, and its lack of presence in the auto community is probably why. How does it work differently from phosphoric? More aggressive?
scarlson is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 02:31 PM.