A shift of the corrosion potential in the positive direction (“ennoblement”) has been observed for cartridge brass and Al 2024 (UNS A92024) exposed to artificial seawater or Luria Bertani growth medium in the presence of bacteria such as B. subtilis, B. licheniformis, or E. coli. Since ennoblement was always accompanied by a reduction of corrosion rates, it can be assumed that natural biofilms produce inhibitive species. The production of polypeptides and polyphosphates by biogenetically engineered bacteria provided additional corrosion protection.

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NACE International
2002
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