Pitting Feedback Loop (Oxygen Differential Cell)

One mechanism from Chapter 7: Corrosion.

flowchart TD
    D["Deposit, crevice, or pit forms"] --> L["Low oxygen inside = small Anode"]
    D --> H["High oxygen at rim = large Cathode"]
    L --> V["Voltage rises, resistance drops"]
    H --> V
    V --> CD["Current density concentrates at pit"]
    CD --> CL["Chloride migrates in, acid concentrates"]
    CL --> RP["Repassivation blocked"]
    RP --> L

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Diagrams · The Big Picture · Chapter 7