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Thanks for the recommendation on Bivo. I like the concept of stainless steel water bottles, but finding a good one is hard. The largest one I've had became unus

Thanks for the recommendation on Bivo. I like the concept of stainless steel water bottles, but finding a good one is hard. The largest one I've had became unusable after it's stainless steel coating wore off at the mouthpiece and started imparting a rusty metallic flavor into every sip of water. The best one I've had, which did not have that problem, became unusable after it dropped on the ground and it's bottom became so bent it could no longer stand properly. I have to acknowledge that plastic bottles either don't have these problems or overcome these problems much more effectively.

Tagbert 5y ago
If a coating wore off, then that was probably a plastic coating over the steel. Stainless steel contains chromium and nickel within the steel. Those metals form a hard protective surface that blocks oxygen. If that surface were scratched, the underlying metals would reform the protective surface upon exposure to oxygen.
- 1MachineElf 5y ago
  Either way, it's also possible that the coating on the bottle's rim was wore down by saliva. For stainless steel, research has been done for certain grades like 316 for dental applications, but it's possible other grades are not as resistant.