Headset Failure, Frame Damage

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Zeus 2000 aluminum headset cup, in contact with titanium, oxidized in salt air; headset oxidization damaged frame:

From http://www.yellowjersey.org/photosfromthepast/PARDOOX.JPG. Caption reads:

This Teledyne, above, which was sold here new in 1976, spent a year hanging on the veranda in Pago Pago Samoa. Here's what the salt air did to a Zeus 2000 aluminum cup in contact with the titanium head tube. Note the conical shape of the previously cylindrical cup and matching head tube expansion Metal oxides are bigger than metals!

Note oxidation occurs in the absence of dissimilar metals, but joints between metals often accellerate oxidation.