Advertise on Bikeforums.net



User Tag List

Results 1 to 8 of 8
  1. #1
    pan y agua merlinextraligh's Avatar
    Join Date
    Aug 2005
    Location
    Jacksonville
    My Bikes
    Wilier trestina Zero 7; Merlin Extralight; Co-Motion Robusta; Schwinn Paramount; Motobecanne Phantom Cross; Cervelo P2
    Posts
    26,711
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    aluminum corrosion

    The crankset on my Paramount has spots on it that appear to be the Aluminum corroding. Any ideas on how to remove the spots? It's only a cosmetic problem, so any solution needs to end up not damaging the finish to the crank.


  2. #2
    so much for physics humble_biker's Avatar
    Join Date
    Aug 2006
    Location
    over there
    My Bikes
    Scott CR1 team, Fuji track pro, NYCbike, Cannondale, Free Spirit, GT Edge
    Posts
    562
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    polish them with a mild car wax and non-abrasive chamios, rag, sponge, etc...

  3. #3
    Senior Member
    Join Date
    Aug 2006
    Posts
    998
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Ammonia gets aluminum corrosion off pretty well. Just make sure to use eye protection and have good ventilation.

  4. #4
    Sensible shoes. CastIron's Avatar
    Join Date
    Aug 2005
    Location
    St. Paul,MN
    My Bikes
    A few.
    Posts
    8,799
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The crank likely has a clearcoat or clear anodizing over it. Tough stuff, but hell to pay when it starts to go. The easier way is to pull the crank and use aircraft stripper and THEN set about polishing the crank.
    Mike
    Quote Originally Posted by cedricbosch View Post
    It looks silly when you have quotes from other forum members in your signature. Nobody on this forum is that funny.
    Quote Originally Posted by cedricbosch View Post
    Why am I in your signature.

  5. #5
    Senior Member Grand Bois's Avatar
    Join Date
    Mar 2005
    Location
    Pinole, CA, USA
    Posts
    14,756
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by CastIron
    The crank likely has a clearcoat or clear anodizing over it. Tough stuff, but hell to pay when it starts to go. The easier way is to pull the crank and use aircraft stripper and THEN set about polishing the crank.
    Aircraft stripper removes anodizing?

  6. #6
    Senior Member
    Join Date
    Jul 2006
    Location
    IN
    Posts
    77
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Dirtdrop
    Aircraft stripper removes anodizing?
    No, but it will remove clearcoat (a paint product).

    If it is bare aluminum, use "Mother's Mag and Aluminum Polish". It is sold at auto stores.

  7. #7
    Senior Member
    Join Date
    Aug 2006
    Posts
    998
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Just buy these -- http://tinyurl.com/poe5b

    I'm pretty sure this will cure your crank anodizing issues.

    But seriously, I'm wondering if sandblasting with walnut shells will remove the clear anodizing (if it is anodizing rather than a paint or lacquer coat), allowing you to use previously mentioned products. It may be a bit expensive though.

  8. #8
    Senior Member
    Join Date
    Jul 2006
    Location
    IN
    Posts
    77
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Anodizing is a process that converts the surface layer to aluminun oxide. Do not think of it as a removeable layer short off sanding/grinding and repolishing.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •