Much of the on-going research in microbiologically influenced corrosion (MIC) is directed at identification of unifying mechanisms for global observations of MIC-related phenomena, e.g., ennoblement of passive alloys and corrosion of carbon steel pilings. Both occur in fresh and saline waters. In the following sections data will be presented suggesting that a single explanation for either is unsatisfactory. The two examples provide evidence that MIC mechanisms can be site specific and multiple mechanisms can be operative, especially in coastal waters where water chemistry varies with location and is subject to riverine inputs and tidal fluxes.
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