Confusing Soulbound Help
Nope. If an item is soulbound, it can only be used by the character it was bound to. Which also means that while that chracter can put the item in your bank (which is shared by all your characters) no one else will be able to take the item out of the bank.
Soulbound = One character only.
Account Bound = Any/all characters on your account.
Black Lion Salvage kits have a 100% chance to salvage the upgrade.