Microorganisms colonize and form a gelatinous biofilm on all engineering materials exposed in natural marine environments, including cathodically protected surfaces. The impact of cathodic protection potentials on the chemical/biological composition of the biofilm and the impact of the biofilms on potentials required for cathodic protection have been the subject of numerous recent investigations. Literature on these subjects will be reviewed with emphasis on clarifying interactions between living and non-living deposits on cathodically protected metal surfaces.

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