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Passivation of a metal means the formation of

  • A.a thin protective film that reduces the corrosion rate
  • B.a thick porous scale that flakes away in service
  • C.a galvanic couple with a more noble metal
  • D.an alloy layer by diffusion at high temperature

Answer: A

Chromium, aluminium and titanium passivate spontaneously in air, which is what makes them useful in aggressive service. Chloride ions can break the film locally and start a pit even while the rest of the surface stays passive.

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