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Corrosion - course of action?

slowbikeslowbike Posts: 8,476
edited February 2018 in Workshop
Whilst fitting some new mudguards to my Allez this week I noticed some bubbling around the crown of the fork.
It's a carbon fork with alloy steerer - so alloy crown too. The rest of the fork is in good condition - the bike is ~6 seasons old and has covered ~9k miles - so it's not "Old" - well - I don't think so anyway.

The corrosion seems to have come from just behind the brake mount - which isn't surprising, it's a joint in the paint and somewhere where the paint could easily be damaged and it has started flaking.

I'm contemplating what I should do with this - at a relatively early stage I guess it would be possible to re-condition the crown - sand back, reapply some primer to seal and finish off with some new paint. I won't be able to match the existing paintwork well - it's Specialized Red - but the forks do have black on them - so a black crown would be easier to achieve without it looking too scruffy.

Thoughts?

Posts

  • svettysvetty Posts: 1,904
    Galvanic corrosion at metal: carbon interface?
    FFS! Harden up and grow a pair :D
  • MatthewfalleMatthewfalle Posts: 17,571
    Sand back, inspect, respray.

    No reason at all why you can't get the same red. Why do you think so?
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • slowbikeslowbike Posts: 8,476
    svetty wrote:
    Galvanic corrosion at metal: carbon interface?

    No - it's where the paint has flaked - so just dirty water getting in. Just around where the brake mounts.
  • slowbikeslowbike Posts: 8,476
    Sand back, inspect, respray.

    No reason at all why you can't get the same red. Why do you think so?

    yup - just toying with if I do that or leave it - but I think it needs doing sooner rather than later (ie the summer when I can ride my carbon bike).

    Matching colours is a nightmare - especially as it'll but straight up to the adjacent red - it'll be noticeable. Far simpler to change the colour - and black is on there - so do a black section around the crown which will not be adjacent to other black sections and therefore an exact match isn't required.
  • MatthewfalleMatthewfalle Posts: 17,571
    slowbike wrote:
    svetty wrote:
    Galvanic corrosion at metal: carbon interface?

    No - it's where the paint has flaked - so just dirty water getting in. Just around where the brake mounts.

    SOunds just like paint flake - sand down, prime, spray.
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • MatthewfalleMatthewfalle Posts: 17,571
    slowbike wrote:
    Sand back, inspect, respray.

    No reason at all why you can't get the same red. Why do you think so?

    yup - just toying with if I do that or leave it - but I think it needs doing sooner rather than later (ie the summer when I can ride my carbon bike).

    Matching colours is a nightmare - especially as it'll but straight up to the adjacent red - it'll be noticeable. Far simpler to change the colour - and black is on there - so do a black section around the crown which will not be adjacent to other black sections and therefore an exact match isn't required.

    It's not that much of a nightmare.

    Remove fork

    Take to paint factor

    Buy can of paint

    Spray
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • slowbikeslowbike Posts: 8,476
    It's not that much of a nightmare.

    Remove fork

    Take to paint factor

    Buy can of paint

    Spray

    you missed:
    see paint join ...

    Black is fine - I can change the design a little :)
  • jermasjermas Posts: 484
    You'll need an acid etch primer to bond to the aluminium.Alternatively, If the area is not noticeable (behind mudguards) you could just remove the bubbling paint and spray with an anti corrosion wax. Supertrol or Comma wax seal dry to a semi-hard finish and will stop further corrosion for years.
  • slowbikeslowbike Posts: 8,476
    It'll be visible - although underneath between the forks could be waxed.
  • MatthewfalleMatthewfalle Posts: 17,571
    slowbike wrote:
    It's not that much of a nightmare.

    Remove fork

    Take to paint factor

    Buy can of paint

    Spray

    you missed:
    see paint join ...

    Black is fine - I can change the design a little :)

    Why will there be a paint join?

    I'm sorry if I sound argumentative but I'm so tired and I may be missing the point.
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
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