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Crevice corrosion occurs in a narrow gap because the solution within it becomes

  • A.enriched in oxygen and depleted of chloride
  • B.identical in composition to the bulk solution
  • C.more alkaline than the bulk solution outside
  • D.depleted of oxygen and enriched in chloride

Answer: D

Diffusion into the crevice is too slow to replace the oxygen consumed, so the gap turns anodic and the acidity and chloride concentration inside both climb. Continuous welds in place of lap joints and gaskets is the design remedy.

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