The following quote from your Bond Dissociation Energy webpage clinches it:
Except in the case of diatomic molecules, the bond dissociation energy is different from the bond energy, which is an average calculated from the sum of the bond dissociation energies of all bonds in a molecule.
Not bad for a BS'er, eh?
As for your breaking of bonds between titanium atoms on the surface of the ISS, that probably happens as well. It is known that UV light tends to turn surfaces powdery over a period of time and don't forget the UV light in space is a lot worse than what you get at the Earth's surface.