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  1. #1
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    Corrosion/oxidation on aluminum frame around bottle mounts, Should I worry?

    I have a 2011 Trek/GF Wahoo. I noticed some bubbling around the bottle mounts on the bottom side of the frame.

    Pictures:

    https://flic.kr/p/mtnpZK

    https://flic.kr/p/mtnsri

    Should I be worried? Would this be a frame warranty issue?

    Any help would be appreciated. Thanks.

  2. #2
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    You can get a cathodic reaction anywhere steel and aluminum meet; there is not a whole lot you can do about that, other than use a non-magnetic stainless w/ alum, or if it is between a fastener and aluminum a coating of synthetic di-electric grease like "super lube" helps to break the bond between the two metals.

  3. #3
    Senior Member
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    Quote Originally Posted by reltor View Post
    You can get a cathodic reaction anywhere steel and aluminum meet; there is not a whole lot you can do about that, other than use a non-magnetic stainless w/ alum, or if it is between a fastener and aluminum a coating of synthetic di-electric grease like "super lube" helps to break the bond between the two metals.
    i've occasionally noticed that frame manufacturers sometimes use different metals on water bottle mounts and frame. one has to wonder what in the world they are thinking.

    the only thing i can think of is that those who do, have a different management hierarchy between the frame design department and the "brazon-on" "doodad" department. more likely, they just don't care. IDK...

  4. #4
    coprolite fietsbob's Avatar
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    those are riv nuts .. scrape the paint down to bare metal and do a little touch up paint job.

  5. #5
    Senior Member rydabent's Avatar
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    What others have said, and while it is cosmetic and you dont like it, dont worry. Aluminium frames are quite thick and you are in no danger of having a failure.

  6. #6
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    Quote Originally Posted by fietsbob View Post
    those are riv nuts .. scrape the paint down to bare metal and do a little touch up paint job.
    +1 ^

    Do this ASAP and replace any non-aluminum metal in the affected area with aluminum.

    The problem with corrosion, is that it likes to spread with time. Once it starts, it just gets wider and deeper

  7. #7
    Senior Member commo_soulja's Avatar
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    I use Boeshield T-9 to treat areas you speak of. Prevents corrosion on various parts of the bike and it's an excellent long lasting chain lube.
    Mythical Creatures Touched Me in my Bathing Suit Area.

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