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Corrosion on Specialized Allez E5 frame

ttwyttwy Posts: 3
edited October 2019 in Workshop
Hi everyone,

I've been having some corrossion on my 2005 Specialized Allez Comp E5 (Columbus Aluminum) that started a few years back and has been growing/spreading.

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I've been reading about how aluminum corrossion forms aluminum oxide that shield the alumnium underneath from this article, but I've noticed how a few layers have already seen to be corroded off. https://bicycleuniverse.com/do-aluminum-bikes-corrode/

Should I look into changing the frame (I don't have warranty on it unfortunately) or is this alright for aluminum bikes?

Many thanks in advance.

Posts

  • i.bhamrai.bhamra Posts: 178
    It looks like all that is flaking off is chunks of paint due to the oxidation spreading under it.
  • ttwyttwy Posts: 3
    i.bhamra wrote:
    It looks like all that is flaking off is chunks of paint due to the oxidation spreading under it.

    Thanks, so the structural integrity isn't affected?
  • keef66keef66 Posts: 13,123
    Same's happening on my alu winter bike around the chainstays / BB area. Corrosion is slowly spreading under the paint and causing it to bubble up / flake off. AFAIK it's just a thin surface effect and it's still structurally sound so far. I'm not going to ignore it though; I have seen alu things disintegrate completely when salt is involved...

    I plan to strip it back to bare metal / sound paint, give it a couple of coats of etching primer, try to match the existing paintwork, then clearcoat.

    Yours looks like it's just clearcoated? So sand it back to bright metal / same finish as the original then give it a couple of coats of clearcoat?
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