Carbon / Aluminium Danger !!!

rockmount
rockmount Posts: 761
edited May 2009 in Workshop
I just pulled the alloy seatpost out of my PX SL Carbon. It is only six months old, and the only rain it has seen has been once when I was caught out in a shower. I was horrified to find severe pitting corrosion on the post. Carbon / aluminium is a poor combination in terms of galvanic corrosion. I was aware of this, but was quite shocked to see the extent of the damage in such a short time ... If you have a carbon / aluminium contact combination, it would be a good idea to check it...
.. who said that, internet forum people ?

Comments

  • Anonymous
    Anonymous Posts: 79,665
    I know of someone who has lost two forks at inopportune moments due to this - carbon fork / aluminium steerer...
  • fnegroni
    fnegroni Posts: 794
    I have a carbon chain stay/seat stay and alu seat tube combination.

    They are, as far as I know, glued together.

    So this happens if water gets in between the two materials, is that correct?
    http://wokinghamcyclist.blogspot.com
  • Monty Dog
    Monty Dog Posts: 20,614
    A well known problem since about 1990! Ask anyone who owned a carbon framed bike of the period, particularly the first Specialized Allez - split tubes and separating lugs were part of the fun.
    Make mine an Italian, with Campagnolo on the side..

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