Microbiologically Influenced Corrosion Cell

One mechanism from Chapter 9: Microbiology.

flowchart TD
  A["Biofilm on metal surface"] --> B["Microbial respiration consumes oxygen at metal interface"]
  B --> C["Oxygen differential: aerobic outer film, anaerobic base"]
  C --> D["Covered metal becomes anodic"]
  A --> E["Metabolic acids accumulate, pH drifts down"]
  E --> F["Re-passivation prevented"]
  D --> G["Localized anodic dissolution accelerates"]
  F --> G
  G --> H["Pitting under deposit, bulk water still looks stable"]

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Diagrams · The Big Picture · Chapter 9