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Pitting is often initiated by

  • A.the complete absence of chloride ions
  • B.an alkaline environment free of dissolved oxygen
  • C.a break in the protective film at a scratch or inclusion
  • D.a uniformly thick and adherent oxide film

Answer: C

A local discontinuity becomes a small oxygen-starved anode surrounded by a large aerated cathode, and chloride ions prevent the film from healing. Polishing the surface and excluding chloride are both genuine preventive measures.

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